1. Asus SCB-2408 - Features, Installation
24x Slim CD-RW
Combo Roundup Vol.1- Page 1
ASUS
SCB-2408-D and LiteOn LSC-24081MX are 4-in-1 external slim combo drives supporting
24x CD-R, 12x CD-RW, 24x CD-ROM, and 8x DVD-ROM.
Featuring
lightweight design and
high-speed interfaces,
the drives mainly address the needs of notebook users, capable, however, of replacing
your internal ATAPI combo in your desktop PC.
- Asus SCB-2408 features
FlextraLink?
Anti-buffer Under Run Error Technology prevents users from buffer underrun problems
caused by an empty data buffer, thereby eliminating the creation of unusable
discs. Throughout
the recording process, FlextraLink? consistently monitors the data buffer status
to ensure best recording quality. Once the available data drops below 1% of
the total buffer capacity, FlextraLink? suspends recording and sets a marker
at the last written position to avoid recording of subsequent blocks. As soon as enough cache
data is refilled in, the pickup head repositions itself to the marker and restarts
the recording.
- 2nd Generation Double Dynamic Suspension System (DDSS II)
The DDSS II is an enhanced follow-up to the first generation Double Dynamic
Suspension System developed by ASUS. The DDSS technology is designed to minimize
the vibration caused by the spindle motor and resonance between components
as well as the drive and PC cases.DDSS II makes tracking and focusing even
more precise, and successfully reduces the vibration and noise caused by high
revolution of the spindle motor.
FlextraSpeed?
(Flexible and Strategic Speed Switch Tech.) for optimal recording speed. FlextraSpeed?
enhances accuracy and reliability when writing/re-writing across a broad base
of certified media. It continuously monitors the recording media and sets the
optimal writing speeds to ensure best recording quality.
- Built-in Proprietary AI Auto Speed Adjustment Technology helps the drive
achieve the best possible readability when coming across a broad base of certified
media in different formats. It not only continuously monitors the reading
speed of the media but also sets the optimal speeds as well. The latter greatly saves
power and prolongs the drive's life.
- Specifications
Data Transfer Rate: |
P-CAV Write/ P-CAV ReWrite/ CAV Read |
Sustained Transfer Rate: |
DVD-ROM: 8X Max. 10820 KB/sec (CAV) |
|
CD-ROM: 24X Max. 3600 KB/sec (CAV) |
|
DAE: 24X Max. 3600KB/sec (CAV) |
|
CD-Write: 24X, 20X, 16X, 10X, 8X, 4X |
|
CD-ReWrite: 12X, 10X, 8X, 4X |
Random Access Time: |
DVD: 120 ms typical |
|
CD: 100 ms typical |
Writing Mode: |
TAO (Track-At-Once) |
|
DAO (Disc-At-Once) |
|
SAO (Session-At-Once) |
|
Packet Write, Multi-Session, DAO-RAW |
Interface: |
USB2.0 and IEEE1394 |
Data Buffer: |
2 MB |
Disc Formats: |
DVD: DVD-ROM, DVD-R/RW, DVD-Video, DVD+R/RW |
|
CD: CD-Audio, CD-ROM, CD-ROM/XA, CD-I, Mixed Mode CD-ROM, Photo CD, CD-Extra,
Video CD, CD-Text, DVCD, Bootable CD |
Configurations: |
Dimensions (W/H/D):
129x16x142 mm |
|
Weight:
250g (0.55 lb) |
The Asus SCB-2408 drive supports 24x P-CAV writing, 24x CAV CD-R/ROM reading and
12x rewriting.
The drive is also able to read DVD-ROM at 8x CAV.
Nero Info Tool confirms the specifications of the drive, reporting
also that the supported writing methods are
the Disc At Once, Track At Once, Session At Once, Packet Writing, Raw
Mode Burning & Over-Burn.
Mount Rainier compliance is not included in the drive's specification
list, and the user is able to change the region of the drive 5 times in total (RPCII).
- The package
The
retail package is complete and includes the external Asus SCB-2408 combo drive,
a manual in English and Traditional Chinese languages, a quick installation
guide in 12 languages and a S/W CD.
This includes Nero Burning Rom software, DVD playback software and USB 2.0
drivers for Win 98SE and Mac OS.
The package also offers one blank CD-R and one CD-RW disc. In the accessories
we should also mention the stylish drive bag (jacket), fitting exactly to the
drive's small dimensions, very handy when you travel or carry the drive.
Last, the retail package includes a complete cable set of USB 2.0 and IEEE
1394 connection cables, and a power adapter.
The ASUS SCB-2408-D features a lightweight and very stylish design. Its dimensions
are only 129x16x142 mm (W / H / D) and its weight is approximately 250g, offering
high portability.
The eject button is placed on the top of the drive, and the top-opened CD
lid is accurate and steady. The user-oriented design includes a play/skip key
and open/stop buttons, allowing full control of the drive when playing an audio
/ MP3 CD.
A headphone jack and a volume control switch are available in the rear panel
of the drive. Here you can also find the dual interface inputs.
- Installation
The Asus drive was connected via the USB 2.0 interface and
was recognized as "ASUS SCB-2408" under WinXp. The
firmware we used for all the tests was v1.20.
2. LiteOn LSC-24081MX - Features, Installation
24x Slim CD-RW Combo Roundup Vol.1- Page 2
- LiteOn LTC-2408IMX features
- SMART- BURN avoiding Buffer Under Run error, Automatically
adjusting writing strategy & running
OPC to provide the best burning quality
- SMART-X Smart Monitoring & Adjusting Read-speed
Technology for eXtraction
- DFS® Floating Double Suspension System to reduce vibration & noise
during recording & reading
- Specifications
Speed: |
Writing: 24x ( 3600KB/sec ) Zone-CLV |
|
Rewriting: 12x ( 1800KB/sec ) Zone-CLV |
|
Reading: |
|
CD: 24x ( 3600KB/sec ) CAV ( 4x ~ 24x
), DAE Maximum Speed 24x CAV |
|
DVD: 8x ( 10800KB/sec ) CAV ( 1.7x ~
8x ) |
Access Time: |
DVD: 100 ms |
|
CD: 95ms |
Writing Mode: |
TAO (Track-At-Once) |
|
DAO (Disc-At-Once) |
|
SAO (Session-At-Once) |
|
Raw Mode Burning |
|
OverBurn |
|
Fixed Packet, Variable Packet, Multi-Session |
Interface: |
USB2.0 |
Data Buffer: |
2 MB |
Disc Formats: |
DVD: DVD family formats, single/dual
layer ( PTPT, OPT), DVD+R/RW, DVD-R/RW |
|
CD: CD family, CD-R & CD-RW discs
( up to 99min. ) |
Configurations: |
Dimensions: 138 ( W ) x 24.7
( H ) x 177 ( D ) mm |
|
Weight: 420g |
The maximum supported writing speed is 24x (Z-CLV) for CD-R and 12x (Z-CLV)
for CD-RW. The 24x (CAV) speed is also the supported reading speed for the
CD-R and the
HS-RW
media.
The maximum reading speed for DVD-ROM is 8x CAV ( 1.7x ~ 8x ).
The LiteOn drive supports either the USB 1.1 or the USB2.0 interface. For
writing/rewriting, the SMART-BURN® function and the 2MB cache buffer can
avoid buffer underrun as well as getting the best writing quality by smartly
adjusting the writing strategy.
Besides, the SMART-X function adjusts the CD-DA / VCD / DVD data extraction
to a maximum allowable speed, according to both data request rate from host
and the quality of the inserted disc.
The drive is compliant to the RPCII
regulations, allowing a user to change
the region code of the drive 5 times.
- The package
The
retail package includes the 24x combo drive, a USB2.0 cable, a Power AC
Adapter and an audio cable, allowing you to connect the drive to external speakers.
The attached CD-ROM's contain the USB storage drivers for Win98 users, Nero
Ver.5.5 for Windows, In CD packet writing software, a user manual in English
and PowerDVD for DVD playback.
In the retail package you can also find a blank multi-speed CD-R and
a blank multi-speed CD-RW disc.
The severe design of LiteOn LSC-24081MX provides a stylish overall appearance,
combined with a very slim structure. The dimensions of the drive are 24.7
x 177 x 138 mm (WxLxH) and its weight is approximately 420gr.
The front panel of the drive is in fact the drive's front-opened loading
tray. The eject button is placed next to the operation LED and the emergency
eject button.
On the rear panel, there are the USB 1.1/2.0 connector, the power adapter
ports and an audio line output, in case you want to connect the LiteOn LSC-24081MX
to external speakers and use it as an audio playback device.
- Installation
The LiteOn drive was connected through the USB 2.0 interface cable and was
identified
as "LITE-ON
COMBO LSC-24081M" under
WinXP.
3. Data CD Reading Tests
24x Slim CD-RW Combo Roundup Vol.1- Page 3
Data CD Reading Tests
Both
drives support the 24x CAV maximum reading speed. However, the obtained reading
speed in the outer tracks of the disc was higher and reached 25x. The drives
gave almost the same average reading speed, approximately 19.1x.
On the seek times test with the 80min pressed disc, the Asus
drive was faster in all three seek modes. LiteOn LSC-24081MX was slow in
the random seek with 191msec, and 222msec for the full seek mode.
Both drives were slower when tested on 80min CD-R media. This time the average
reading speed was 18.9x for the Asus and 18.97x for the LiteOn drive.
As in the test with the pressed disc, the Asus
SCB-2408 performed better than the LiteOn drive and gave low seek times. The
results for both drives are not very changed over those with the pressed disc,
but the LiteOn drive could definitely perform better.
For
the HS-RW reading test we used
Mitsubishi Chemicals 24x US-RW media.
Both drives read the US-RW disc under the CAV mode and
the reported speeds were almost the same. The LiteOn drive was slightly faster
with a 19.11x average reading speed and Asus follows close with a 18.64x speed.
4. CD Error Correction Tests - Asus SCB-2408
24x Slim CD-RW Combo Roundup Vol.1- Page 4
Error Correction Tests - Asus SCB-2408
In the following tests we check the behavior of Asus SCB-2408 when it comes
to reading scratched / defected discs. The test discs we use are the ABEX Test
Discs series
from ALMEDIO.
- ABEX TCD-721R
Errors total
|
Num: 910293
|
Errors (Loudness) dB(A)
|
Num: 49221
|
Avg:-73.8 dB(A)
|
Max:-19.4dB(A)
|
Error Muting Samples
|
Num: 2887
|
Avg: 1.0 Samples
|
Max: 8 Samples
|
Skips Samples
|
Num:0
|
Avg: 0 Samples
|
Max: 0 Samples
|
Total Test Result
|
76.9 points (of 100.0 maximum)
|
The Asus SCB-2408 gave back a few loudness errors, and some of them were
muted. The reported average error was -73.8dB(A), which is low, and no synchronization
problems occurred. The performance of the drive is good and the average score
is 76.9 points
out of 100.
- ABEX TCD-726
Errors total
|
Num: 46446
|
Errors (Loudness) dB(A)
|
Num: 210
|
Avg: -16.6dB(A)
|
Max:-9.6dB(A)
|
Error Muting Samples
|
Num: 8
|
Avg: 3421.3Samples
|
Max: 3584 Samples
|
Skips Samples
|
Num: 0
|
Avg: 0.0 Samples
|
Max: 0 Samples
|
Total Test Result
|
81.6 points (of 100.0 maximum)
|
As you can see from the graph, the only errors reported were in the beginning
of the test disc. Although the severity of the errors is high, the total number
is low, so the total score in this test is 81.6 points out of
100.
- Conclusion
Test Disc
|
Reading Speed
|
Score
|
ABEX TCD-721R
|
Max
|
76.9
|
ABEX TCD-726
|
81.6
|
Average Score
|
79.25
|
The Asus SCB-2408 drive gets a good average score of 79.25 out
of 100 at the
reading error correction tests with the Abex Test discs.
- Nero CDSpeed tests
Nero CDSpeed quality test with the 721R Abex disc gave Asus an adequate
quality score: 64.2 points out
of 100. However, the estimated C2 accuracy is very low (33.69%) and 245 sync
errors were reported.
5. CD Error Correction Tests - LiteOn LSC-24081MX
24x Slim CD-RW Combo Roundup
Vol.1-
Page 4
Error Correction Tests - LiteOn LSC-24081MX
In the following tests we check the behavior of LiteOn LSC-24081MX when it
comes to reading scratched / defected discs. The test discs we use are the ABEX
Test
Discs
series from ALMEDIO.
- ABEX TCD-721R
Errors total
|
Num: 168927368
|
Errors (Loudness) dB(A)
|
Num: 799339
|
Avg:-25.6dB(A)
|
Max:-5.6 dB(A)
|
Error Muting Samples
|
Num: 357891
|
Avg: 5.5 Samples
|
Max: 3584 Samples
|
Skips Samples
|
Num:3
|
Avg: 8.0 Samples
|
Max: 12 Samples
|
Total Test Result
|
62.3 points (of 100.0 maximum)
|
LiteOn LSC-24081MX gave back many errors, and he average level was high (-25.6 dB).
However, many errors were muted .The
performance
is quite fair and the average score is 62.3 points out
of 100.
- ABEX TCD-726
Errors total
|
Num: 7
|
Errors (Loudness) dB(A)
|
Num:2
|
Avg:-79.4 dB(A)
|
Max:-53.7 dB(A)
|
Error Muting Samples
|
Num:0
|
Avg: 0 Samples
|
Max: 0 Samples
|
Skips Samples
|
Num:0
|
Avg: 0 Samples
|
Max: 0 Samples
|
Total Test Result
|
94.9 points (of 100.0 maximum)
|
This time the performance is really high. The ABEX-TCD-726 disc was read accurately,
and only 7 total errors were reported. The total score
of the drive is 94.9 points
out of 100.
- Conclusion
Test Disc
|
Reading Speed
|
Score
|
ABEX TCD-721R
|
Max
|
62.3
|
ABEX TCD-726
|
94.9
|
Average Score
|
78.6
|
LiteOn LSC-24081MX gets a good score of 78.6 out of
100 at the reading error correction tests. Although the drive did not manage
to completely conceal the errors on the scratched TCD-721R disc, it performed
very well with the TCD-726 disc (defects, fingerprints).
- Nero CDSpeed tests
According to the Nero CDSpeed, the LiteOn drive gave back a high score
at 71.9 out of 100, while the C2 accuracy of the drive reached
97.33%. The results confirms those we got with the EAC test suite, by using
the same test disc. The
software also reported some synchronization errors.
6. DVD Reading Tests
24x Slim CD-RW Combo Roundup Vol.1 - Page 6
DVD reading tests
Both drives officially support 8x maximum reading speeds under CAV
mode for the single layer DVD-ROM media. However, the CDSpeed transfer test
with Asus showed that the drive read the disc under the P-CAV mode, and the
reading speed did not reach the 8x. As a result, the average reading speed
was 6.01x. On the other hand, the LiteOn drive was faster
achieving 6.26x reading.
On the contrary to the seek times test with CD-R media, Asus SCB-2408 gave
slightly higher seek times than the LiteOn drive, in the case of DVD-ROM discs. In the
Random seek mode, both drives were fast and needed around 100msec, while the
1/3 mode test was harder for the Asus drive (120 msec).
The PTP dual layer DVD-ROM was read successfully by both drives. LiteOn LSC-24081MX
read each layer at 6x CAV (2.43x ~ 5.99x), while the Asus drive was slower
reaching a 5.35x speed by the end of each layer.
In the same test, using the dual layer DVD-ROM, we measured the seek times
of the drives. Asus SCB-2408 was slower than the LiteOn LSC-24081 in all three
seek modes, although the times were not very high, with an exception in the
case of the full seek mode (305msec).
- DVD Ripping Tests
We measured the DVD Ripping speed using the "Matrix" DVD Video
title and the DVD Decrypter software.
Both drives were fast and ripped the image successfully to the hard disk .The
drive achieved a 6345kb/s (4.58x) ripping speed, which is a good result and
faster than the Asus drive, which maxed at 5835 kb/s (4.21x).
- DVD±R/RW
The chart below shows the Nero CDSpeed results with 4x DVD±R, 2x DVD-RW
and 2.4x DVD+RW media.
Asus SCB-2408 read the DVD-R disc at 7x P-CAV speed, while the LiteOn LSC-24081MX
was slower at 5.68x CAV. The DVD-RW disc was read by both drives at a similar speed (2.2~2.5x CAV).
The 4x DVD+R disc was somewhat harder to be read for both drives. The CDSpeed graph of
the Asus drive reveals that the drive slowed down after reaching approximately 3,5GB of the disc, while the LiteOn had the same behavior when reaching
3.8GB of reading data. The average speed for the Asus drive was 5.82x (P-CAV) and for
the LiteOn 5.81x (CAV).
Last, the DVD+RW reading test resulted for the LiteOn drive to an average speed of 4.26x. The Asus drive was slightly faster approaching 4.34x. The disc was read under
the CAV mode.
7. DVD Error Correction Tests - Asus SCB-2408
24x Slim CD-RW Combo Roundup
Vol.1 - Page
7
DVD Error Correction
Tests
Asus SCB-2408
In the following tests we examined the DVD error correcting capabilities of
the Asus SCB2408 drive.
For the tests we used CDVD Benchmark v1.21 and Nero CDSpeed . The reference
test
media
comes
from
ALMEDIO.
- Single Layer media
ABEX TDR-821
This is a single sided, single layer DVD-ROM with a 4.7GB capacity, and its
surface has an artificial scratch of dimensions varying from 0.4 to 3.0 mm. The
following transfer rate picture comes
from the CDVD Benchmark v1.21 transfer rate test.
Asus SCB-2408 read the disc contents flawlessly without posting any errors. The
drive started reading the disc at a low speed, but accelerated at 3.5x
very fast, to reach 6x speed by
the 900,000 sector address. Reading finished at 6x and no read errors occurred.
ABEX TDR-825
This is also a single sided, single layer DVD-ROM of a 4.7GB capacity.
The data structure of the disc is exactly the same as that of the TDR-821, with the
difference that there are no scratches on it but defected areas of dimensions
ranging from 0.5 to 1.1 mm. There are also fingerprints sized between 65 and 75 micrometers.
As in the previous test, the drive finished with no read errors. The reading
speed was 6x P-CAV.
- Dual Layer media
ABEX TDR-841
This is a 8.5GB dual layer, single sided DVD-ROM disc with artificial scratches
of dimensions from 0.4 to 3.0mm, in both layers.
Compared to the Abex TDR-821 test disc, the TDR-841 has the same contents
and scratches, but it is a dual layer PTP disc. Asus SCB-2408 read both layers
at 5.5x CAV and no read errors were reported.
ABEX TDR-845
The disc is a single sided, dual layer DVD-ROM disc of a capacity of 8.5GB.
The only difference between the TDR-845 and the TDR-841 is that the first includes
defected areas and fingerprints. The dimensions of the defected areas range
from 0.5 to 1.1 mm and the fingerprints are sized from 65 to 75 micro meters.
Once again the drive had no problems to read the defected dual layer DVD.
The performance of the drive is familiar to that of the TDR-841 test disc and the
maximum reading
speed at the end of each layer was 5.5x.
ABEX TDV-541
The TDV-541 is a single sided, dual layer DVD-VIDEO disc, with a capacity of
8.5GB.The disc is based upon the
TDV-540 series which is designed for inspection and adjustment of DVD-VIDEO
players.
The discs
check
the layer
switch
operation
from layer 0 to layer 1 and also include test pictures and test signals for
DVD sound files. The current TDV-541 checks also the error correcting capabilities
of the drive and includes scratches from 0.4 to 3.0 mm.
Testing the reading performance of a DVD-Video disc is very important, since
many users use their DVD-ROM drive to watch their favorite movies on their
PC. The Asus drive read the disc smoothly using the CAV mode for both layers.
Note that the test disc is an OTP. The average reading speed for each layer
was 4.02x.
ABEX TDV-545
The TDV-545 disc is based on the TDV-540 series. It is a single sided, dual
layer DVD-VIDEO disc with a capacity of 8.5GB. The TDV-545 includes artificial
black dots on the data surface, sized from 0.4 to 1.0 mm. It has also 65 -
75 micro meters fingerprints.
According to the CDSpeed transfer graph, the defected areas of the disc did
not produce any read errors. They did not even make the drive slow down its reading speed. The
performance is considered very good.
8. DVD Error Correction Tests - LiteOn LSC-24081MX
24x Slim CD-RW Combo Roundup
Vol.1 - Page
8
DVD Error Correction
Tests
LiteOn LSC-24081MX
In the following tests we examined the DVD error correction capabilities
of the LiteOn LSC-2408MX drive.
For the tests we used CDVD Benchmark v1.21 and Nero CDSpeed . The reference
test media comes from ALMEDIO.
- Single Layer media
ABEX TDR-821
This is a single sided, single layer DVD-ROM with a 4.7GB capacity, in which
there are scratches of dimensions 0.4 to 3.0 mm. The following transfer
rate picture comes from CDVD Benchmark v1.21.
The LiteOn LSC-24081MX managed to finish the ABEX TDR-821 test disc without
reporting any errors. Although the drive needed to read many times the scratched
area of the disc, it did not slow down and gave no read errors. However, the drive
did not read the DVD-ROM disc at 8x CAV as it did in the previous tests, but
used the 5x P-CAV strategy.
ABEX TDR-825
This is also a single sided, single layer DVD-ROM with a 4.7GB capacity.
The data structure of the disc is exactly the same as that of the TDR-821, with the
difference that there not scratches on it but defected areas of dimensions
0.5 to 1.1 mm. There also fingerprints sized from 65 to 75 micro meters.
The disc was read at 5x P-CAV and no read errors were reported.
- Dual Layer media
ABEX TDR-841
This is a 8.5GB dual layer, single sided DVD-ROM disc with artificial scratches
of dimensions ranging from 0.4 to 3.0mm, in both layers.
LiteOn had no problem to read the scratched dual layer DVD-ROM. The performance
is very good and both layers were read without errors.
ABEX TDR-845
The disc is a single sided, dual layer DVD-ROM disc with a capacity of
8.5GB. The only difference among the TDR-845 disc and the TDR-841 is that the
first includes defected areas and fingerprints. The dimensions of the defected
areas range from 0.5 to 1.1 mm and the fingerprints are sized between 65
to 75 micro meters.
At this test the LiteOn drive seems to had reading problems at the second
layer of the disc. Although the CDVD Benchmark didn't
report any errors the drive seems to read the second layer many times to maintain
accurate reading.
ABEX TDV-541
The TDV-541 is a single sided, dual layer DVD-VIDEO disc, with a capacity
of 7.91GB. The disc is based upon the TDV-540 series, which is designed for
inspection and adjustment of DVD-VIDEO players. The discs check the layer
switch operation from layer 0 to layer 1 and also include test pictures and
test signals for DVD sound files. The current TDV-541 checks also the error
correcting capabilities of the drive and includes scratches of dimensions ranging between 0.4 and 3.0
mm.
On this test the LiteOn drive read the discs under CAV mode and
gave back an average speed at 4.47x. The DVD-Video disc was read accurately,
with increased, however, seek times reported.
ABEX TDV-545
The TDV-545 disc is based on the TDV-540 series. It is a single sided,
dual layer DVD-VIDEO disc of a capacity of 8.5GB. The TDV-545 includes
artificial black dots on the data surface, sized between 0.4 to 1.0 mm. Moreover, it contains 65 - 75 micro meters fingerprints.
The defected DVD-Video disc was read flawlessly and the maximum speed for
each layer was 6x (CAV). As in the previous test, the reported seek times
are high.
9. Data Protected DiscsTests
24x Slim CD-RW Combo Roundup Vol.1- Page 9
Data Protected
Discs Tests
The software we used for making the image of the protected titles onto the
hard disk was Alcohol 120%. In this page, we examine the duration of the ripping
process on a variation data protection builds. Below you can see the information
of both Asus and LiteOn drives, provided by CloneCD:
- PSX Pressed Media
For this test we used the PSX game 'NBA Jam Extreme' and we ripped the
image to the HD with Alcohol 120%. We used the default settings
for PSX, and the "Read Sub-Channel Data" option was enabled.
The Asus drive was much faster. It finished the task in
93sec, while LiteOn LSC-24081MX required 413 seconds.
- SafeDisc v.2
Asus SCB-2408 finished the task in 4:50 minutes, and LiteOn LSC24081MX was
slower with 10:58 min (505,18 sectors/sec).
- SecuROM v.2
On the securom v2 image making process, both drives spent exactly the same
time for completion. Note that reading of subchannel data from audio/data tracks
is included in the capabilities of the drives.
- Writing Tests
The Alcohol software reports that both drives support the DAO-RAW and DAO-SAO
features. For checking the drive's EFM correction status, we used 3 different
game titles
with different SafeDisc 2 versions, with the latest software patches installed on both drives.
Each one of them was used as a reader/writer at the maximum reading/recording
speed. Two discs were burned for each game (ByPass EFM Error On/Off). The results
are posted in the table below:
Game Title
|
Tested Drive
|
SD2 Build
|
Settings
|
ByPass EFM Error
On
|
ByPass EFM Error
Off
|
Serious Sam - The Second Encounter v1.07
|
Asus SCB-2408
|
v.2.60.052
|
ok |
ok |
LiteOn LSC-24081MX
|
ok |
ok |
The Sims - Unleashed
|
Asus SCB-2408
|
v2.80.010
|
ok |
ok |
LiteOn LSC-24081MX
|
ok |
ok |
Both drives offer a high EMF error correction.
At the first part of the test we used the default settings of Alcohol with
EMF error correction enabled and both drives managed to make working back-ups.
Disabling the EMF error correction option did not make any difference and the
backups worked in all the players we tried them flawlessly.
10. DAE Tests
24x Slim CD-RW Combo Roundup Vol.1- Page 10
DAE Tests
- Pressed and CDR AudioCD results
The test discs hold 74min of audio files. Both drives support 24x CAV
DAE and behaved in a similar way in the test. The average ripping speed for
the
Asus drive is 17.5x and 17.3x for LiteOn LSC-24081MX (pressed disc). The same
test with copies of the original audio discs, showed that both drives are slightly
slower rippers when using CD-R audio discs.
- Advanced DAE Quality
Asus SCB-2408
|
|
LiteOn LSC-24081MX
|
|
LiteOn and Asus drives got the same quality score 100.0 (perfect)
and almost the same average ripping speed, around 17.5x.
On the advanced features tab, the CDSpeed reports that Asus does
not support
leadin
and leadout reading. Both drives support reading of CD-Text
and subchannel data.
- 99mins AudioCDs
Tested drives
|
Ripping up to 99min
|
Asus SCB-2408
|
OK
|
LiteOn LSC-24081MX
|
OK
|
For this test we used a 99min audio disc and EAC software for ripping the disc's
contents. Both
drives
managed
to
rip all the audio files without any errors.
- Reading/Ripping Protected AudioCDs
For the test procedure we used 2 protected AudioCDs, which we
tested in both the processes of recognition and ripping (with EAC):
* Pressed AudioCD with Sony Key2Audio (Celine Dion - New Day
Has Come)
* Pressed AudioCD with Cactus Data Shield 200 (Natalie Imbruglia
- White Lilies Island)
|
Key2Audio
|
CDS200
|
EAC
|
Asus SCB-2408
|
OK
|
Recognizes disc contents but cannot
rip them
|
LiteOn LSC-24081MX
|
Cannot recognize
|
Recognizes disc contents but cannot
rip them
|
The LiteOn drive is weak when it comes to audio protections, since it cannot playback
or rip the audio files of both Key2Audio and Cactus Data Shield 200 disc. On
the other hand, the Asus drive performed better, at least in the case of the Key2Audio
disc.
11. Recording Tests
24x Slim CD-RW Combo Roundup
Vol.1-
Page 11
CDR Tests
We tested both drives with the latest version of Nero Burning Rom. Asus
and LiteOn drives support the same maximum writing speed, but they do not use
the same writing strategy. All the available writing speeds for each drive are
illustrated below:
Nero CDSpeed simulates the writing process with blank CD-R discs. As you
can see in the snapshots below, the Asus drive writes the blank disc under the
P-CAV mode.
The
average writing
speed
reported
by the software is 18.90x
and
the drive reached the 23.91x after the 70:00min address of the disc.
The LiteOn drive uses a multi-step Z-CLV writing mode for the maximum 24x
writing speed. The average writing speed for the drive is actually 16.31x:
- Burning Tests
We used Nero Burning
Rom to create an 80min data compilation. Both drives burned the data
to a 700MB disc. The Asus drive was faster than the LiteOn, due to the P-CAV
writing strategy instead of the Z-CLV of the LiteOn LSC-24081MX:
Below you can see the best writing times of the drives, for all the available
writing speeds:
The adopted Z-CLV writing mode of LiteOn LSC-24081MX makes it slower than
the Asus drive (P-CAV).
- Other features
Tested Drives |
Asus SCB-2408 |
LiteOn LSC-24081MX
|
Overburning
|
Up to 98min
|
Up to 98min |
CD text reading/writing
|
Yes
|
Yes |
12. 3T Jitter Tests - Asus SCB-2408
24x Slim CD-RW Combo Roundup Vol.1- Page 12
Writing Quality Tests
Asus SCB-2408
We used 48x 80min CD-R media by Taiyo Yuden and burned the same
AudioCD project at all the available recording speeds between 8x-24x. Below
you can see
the 3T Pit & Land Jitter graphs.
- 3T Pit results
The graph show us that the 3T Pit Jitter stays
below the 35ns RED book limit at all recording speeds.
The highest Pit Jitter value came from the 24x written disc, and the maximum
value by
the end of the disc reached the value of 34ns.
The
average 3T Jitter values for all recording speeds are illustrated in the
following table.
As the recording speeds climb, the average 3T pit jitter increases, as we
have noted in many other drives that use the CAV writing strategy. However
the jitter values are low for all the writing speeds.
- 3T Land results
Although the 3T land jitter values were slightly over the 3T pit results,
the performance remains high.
- Conclusion
Recording Speed
|
3T Pit Jitter (ns)
|
3T Land Jitter (ns)
|
> 35ns
|
Max value (ns)
|
8X
|
24.54
|
30.46
|
No
|
26 Pit, 34 Land
|
16X
|
26.12
|
28.95
|
No
|
28 Pit, 32 Land
|
20X
|
28.34
|
30.05
|
No
|
32 Pit, 33 Land
|
24X
|
29.80
|
31.51
|
No
|
34 Pit, 36 Land
|
Asus SCB-2408 returned very low jitter values for all the supported writing
speeds. We can thus easily say that the provided writing quality of the
drive is high and certainly will not be influenced by the jitter.
13. Jitter Tests - LiteOn LSC-24081MX
24x Slim CD-RW Combo Roundup Vol.1 - Page 13
Writing Quality Tests
LiteOn LSC-24081MX
The media we used are Taiyo Yuden 48x, as in the previous measurements in the case of
the Asus drive.
- 3T Pit results
The 16x recording speed gave the highest 3T Pit Jitter values, which reached
a value of 40nsec after the 70:00 min address of the disc. Although this value is not
very high, it is surprising that the drive did not produce the highest jitter
when writing at 24x. This is probably related to the Z-CLV implementation
for writing at 16x.
Below, you can see the average 3T pit jitter values for all the recording speeds.
- 3T Land results
In the 3T land jitter graph you can see that the performance is high for all
the writing speeds. Again, the disc recorded at 16x gave the highest jitter
(35nsec), as well as the the 20x disc, the latter in the 20 - 30 min address space.
- Conclusion
Recording Speed
|
3T Pit Jitter (ns)
|
3T Land Jitter (ns)
|
> 35ns
|
Max value (ns)
|
12X
|
28.95
|
28.34
|
No
|
35 Pit, 32 Land
|
16X
|
34.05
|
31.95
|
Yes
|
40 Pit, 35 Land
|
20X
|
31.63
|
30.59
|
Yes
|
36 Pit, 35 Land
|
24X
|
30.17
|
30.02
|
Yes
|
36 Pit, 33 Land
|
LiteOn seems to offer adequate results with MC 48x
media. Jitter was low at al the supported writing speeds, except at 16x, where
the pit jitter values were slightly increased.
14. ReWriting Tests
24x Slim CD-RW Combo Roundup Vol.1- Page 14
HS-RW Tests
We used a Mitsubishi HS-RW discs and Nero Burning Rom for writing at
the maximum allowed speed for both drives.
Asus SCB-2408 supports
4x, 8x, 10x and 12x CLV rewriting speeds.
LiteOn LSC-24081MX is able to rewrite at 4x, 8x, 10x CLV and 12x Z-CLV.
Below you can see the rewriting times of the drives at 12x for a 700MB data
compilation with Nero Burning Rom:
The Asus drive gave a lower recording time than the LiteOn LSC-24081MX,
due to the CLV writing mode. LiteOn could also use the CLV strategy for such
a low writing speed, since the supported Z-CLV demands some extra seconds.
- Packet Writing Tests
We used InCD and Ricoh HS-RW media for all
Packet Writing tests.The formatted disc had 530mbs of free space. We copied
a 403 MB file (403.147 KB) from a
Hard Disk (on the same
PC as the writers) to the formatted RW media using explorer (we dragged and
dropped):
The Asus drive was slower than LiteOn in both reading and writing tasks.
15. Conclusion
24x
CD-RW Combo Roundup Vol.1-
Page 15
Conclusion
LiteOn
LSC-24081MX |
Pros
|
Cons
|
- Simple and stylish
design
- Fast CD-R/RW/DVD-ROM reading
- Low CD/DVD seek times
- Supports DVD-R/RW, +R/RW, DVD-ROM formats
- High error
correction performance with CD-R / DVD
- Low 3T Jitter
- 24x maximum DAE speed
- High C2 information
accuracy
- Fast DVD-Video
ripping
- Overburning up to 98min
- Supports CD-Text (reading/writing)
- Supports 99min discs
- Creates working
SafeDisc v.2 backups
- Reasonably priced
|
- Z-CLV implementation
leads to increased recording times
- Does not support
audio protected discs
- Increased CD seek times
|
|
|
Asus
SCB-2408
|
Pros
|
Cons
|
- Very Stylish
design, 250 g weight
- Dual USB 2.0/1.1
& IEEE 1394 supported interface
- Small dimensions, light weight
- Complete retail
package
- Fast CD-R/RW/DVD-ROM reading
- Supports DVD-R/RW, +R/RW, DVD-ROM formats
- High error
correction performance with CD-R / DVD
- Low recording
times
- Low 3T Jitter
- 24x maximum DAE speed
- Overburning
up to 99min
- Supports CD-Text (reading/writing)
- Supports 99min discs
- Supports Key2Audio
audio protected discs
|
- DVD seek
times could be lower
- Low C2 information
accuracy
- Cannot recognize Cactus Data Shield 200 audio protected discs
- Low packet writing
reading / writing speeds
- High price
|
Portability and high performance are the main characteristics of both Asus
and LiteOn drives. Having nothing to hide, the drives performed adequately
in most of the benchmarks, and confirmed their official specifications.
Asus has paid attention to the retail package and the drive's design, while
LiteOn preferred keeping a more spartiatic attitude, without, however, neglecting the
performance factor. Asus SCB-2408 comes in a complete retail package with many
accessories and documentation, while the LiteOn LSC-24081MX box contains only
the essential parts for operation.
The small dimensions and the low weight of the drives make them a very handy
solution when attached to your notebook or your PC. In addition, Asus offers
a dual USB and IEEE 1394 connection interface, while LiteOn chose to support
only the USB 2.0, mainly focusing to lower cost. As a note, in the LiteOn's
design we might say that the response of the eject button could be better.
The LiteOn LSC-24081MX supports the 24x Z-CLV maximum recording speed for
the CD-R format. Our tests showed that the current implementation of the Z-CLV
technology does not allow the drive to achieve the lowest writing times among
the 24x category drives, including Asus SCB-2408. However, the writing stability
for both drives is very good and no writing problems occurred while writing
on various media. In addition, both the Jitter measurements on the recorded
media showed a high writing quality.
In the reading part, the drives are fast and the reading speeds reached the
maximum supported 24x, on both pressed and CD-R media. The Asus drive gave slightly
increased seek times on DVD-ROM media, while the LiteOn could be improved
in this area when using CD-R discs. The entire available DVD recordable / rewritable
formats (except DVD-RAM) were read fast, including the DVD-Video discs.
A very impressive performance of both drives is on the error correction tests
with CD-R and DVD media. In the case of ripping scratched audio discs, both drives
corrected / concealed most of the reading errors, resulting to high scores
in the corresponding tests. Please note, that the Asus drive does not retrieve C2 error
information 100% accurately, allowing the LiteOn drive to be a better solution
for tasks based on retrieving C2 information. DVD-ROM reading was fast and
accurate in the case of not only normal but even on defected discs.
The maximum supported DAE speed is 24x for both drives. The audio protected
discs are not supported by the drives, since the LiteOn cannot recognize them
and the Asus can only handle the Key2Audio discs.
Another strong feature of both drives is their ability to create working backups
of the latest SafeDisc v.2 protected titles.
If price is a basic factor for choosing one of the tested drives,
then we should mention that the LiteOn is a more affordable proposal and is
available at a price rated approximately 130-140 Euros. The complete retail
package, as well as the dual interface support of the Asus drive, increases its
retail price. It is available at about 180 - 200 Euros. For different reasons, each drive
deserves our credits.