PX-208T combo CDRW/DVD
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CD Error Correction tests
In the following tests we examine the error correction capabilities of Plextor
PX-208T. We use the built-in Nero CD Speed v0.99.3 CD Quality test. The reference
test media come from ALMEDIO and Philips corporations.
- ABEX TCD-714R
This test disc has been produced for measuring and adjusting the tracking servo
characteristics of the drive, against the eccentricity of compact disc. The
fundamental characteristics of this disc other than on eccentricity are compatible
with the standards in "Red Booklet".
The test examines the ability to trace eccentricity of the compact disc player.
In reference to a zero eccentricity disc, we check the following phenomena:
a. There is skipping of sound tracks
b. Requires excess time to locate or cannot locate the starting point of the
c. Mechanical noise is heard from the CD player
d. Requires excess time to read or cannot read the TOC information
e. The spindle motor runs wild
Physical characteristics of disc:
Eccentricity: 280 micro meters
Deviation: 3 micro meters
Our tests did not show any of the above negative behaviors from the Yamaha
- ABEX TCD-721R
This test disc is produced with the objective of measuring and adjusting the
CD player's tracking servo characteristics and error correction ability against
scratches on the disc. Artificial scratches with lengths from 1.8 mm to 3.0
mm are found on the disc. The phenomenon that may occur during playback of the
disc contents are:
a. Noise is created
b. The sound skips
c. The same section is repeatedly played
d. Start of the tune cannot be detected
e. The spindle motor rotates erratically (reverse rotation, change in revolution,
Nero CD Speed showed that the drive gave 1178633 read errors during the reading
process. The read errors occurred when the size of the errors on the disc became
large enough, and continue until the end of the disc.
- ABEX TCD-726
This disc is produced for measurement and adjustment of error ability and tracking
/ focusing servo characteristics of a CD player against defects included in
some discs. Three kind of defects, interruption, black dots and fingerprints
are prepared in this disc. The interruption defects are sized from 0.5 mm to
1.0 mm. The black dots are from 0.4 mm to 1.0 mm. Lastly, the fingerprints are
from 65 to 75 micro meters.
Plextor PX-280T gave some read errors in the artificially interrupted areas
of the disc, and also in the wide black dot spot.
- PHILIPS SBC-444A
Another test disc that comes from Philips. The purpose of this disc is adjustment
/ checking of the CD player. Note that the disc is not within specification
concerning local defects. The defects found on the disc are interruptions of
the information layer, black dots at out-read area, and simulated fingerprint.
The drive did not have any reading problems with the specific disc. The reading
speed was gradually increased as the drive reached to the end of the written
data, at 60min.