- CD Format
our CD transfer rate (reading) tests, we used the Nero CDSpeed utility and a
set of both Pressed and CDR media. Let's take a look at how the Sony drive performed
compared with the other two drives.
Note that you have to press the eject button for a few seconds, until the
drive's activity led blinks twice, in order to set the drive to 48X
reading speed. This is a procedure you'll have to repeat each time
you open/close the drive's tray, otherwise it reverts back to 40X.
All drives support the same maximum reading speed for the CD format, that
of 48X. Their performance as reported by CDSpeed was similar with the SONY drive
being a little faster.
Despite boasting 48X reading speed, the Sony drive seems to could only manage
34.6X maximum reading speed with RW media.
For this tests we used a pressed AudioCD and its copy on a CD-R.
When reading AudioCDs, the NEC drive supports 40X DAE speed while the Philips
and SONY 48X. All drives managed a perfect score of 100 in Nero's Advanced DAE
Below is the graph of 90min test disc which we stopped trying to play/rip due
to the very slow speed of 0.8X~1X.
The Q30A failed to read the 99min test disc and it reported an error just before
the end of the disc.
- DVD Format
let's have a look at how the drive performs with DVD media. Again, a set of
DVD media was used, both SL and DL.
Same specifications for all drives and hence, similar performance. All reached
the 16X maximum reading speed.
The two layers of a PTP DVD-ROM disc are read sequentially with
the drive starting reading from the inner part of the disc, which is the beginning
of each layer, progressing towards its outer range. NEC and Philips reported
similar performance, with 12X support, while the SONY supports up to 8X.
The first layer of an OTP dual layer DVD-ROM is read exactly
the same way as the first layer of the PTP disc we tested previously, the main
difference being the reading strategy of the second layer on the disc. The beginning
of the second layer is located in the outer part of the disc, so the drive starts
reading from the outer tracks towards the inner part of the disc. Again, the
Sony drive supports up to 8X reading.
The supported reading speeds for DVD±RW are the same for all tested
drives. In the case of DVD±R, the NEC is the fastest since it supports
16X while the SONY and Philips drives support 12X for the same formats.
Average ripping performance from the Sony and NEC drives. Only the Philips
drive offers a high ripping transfer rate.
Nero CD-DVD Speed Graphs
CD Pressed / CD-R / US-RW / AudioCD / AudioCD-R
DVD Pressed SL / DVD Pressed DL PTP / DVD Pressed DL OTP / DVD-R / DVD-RW / DVD+R / DVD+RW