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Home > Hardware Reviews > Optical Storage > DVD Recorders Double Layer

Thursday, December 22, 2005
Plextor PX-755A

2. Reading Tests

CD Format

For our CD transfer rate tests, we used Nero CD-Speed utility and a set of both Pressed and CDR media. Let's take a look at how the drive performed in comparison to the other two drives.

The 755A supports up to 40X reading speed with CD pressed and CDR media. Not the fastest CD reader on the market, as we can see from the above graphs, where the other two comparison drives support up to 48X for this type of media.

Good reading speed was reported while using USRW media, with the Plextor drive reporting an average speed of 30X and a max speed over 40X.

- AudioCD

For the Audio CD tests, we used a pressed AudioCD and the Advanced DAE CDSpeed feature.

CD-Speed Advanced DAE Quality Test awarded a Quality Score of 100 with an average speed of 29.33X. No Data and Sync Errors were reported, while the drive can Read CD Text and Subchannel Data, and supports Leadin and Leadout reading.

- 90mins Audio disc

- 99mins Audio disc

Unfortunately, the drive cannot read either the 90 or the 99 min audio discs.

- DVD Format

Let's have a look at how the drive performs with DVD media. A set of DVD media was used, both SL and DL.

All three drives reported almost identical high speeds, since the max supported speed with SL pressed media is 16X for the three drives.

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. With this kind of media, the Plextor 755A and BenQ DW1640 managed to achieve a max reading speed of 12X, reporting an average speed of 9X, leaving the LiteOn somewhat behind as its max reading speed with DL media was just above 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. Similar performance to that of the PTP media where the Plextor and BenQ drives reached 12X and the LiteOn 8X reading speeds.

With write once media, the Plextor and LiteOn drives support the same speed, reporting an average reading speed of 9X, while the BenQ drive managed the highest speed with all tested media.

If you keep the eject button pressed for three seconds without inserting any disc, the riplock is deactivated and the ripping speed of the drive increases up to 9.6X average (maximum 12.1X).

-Appendix

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




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