Plextor PX-755UF 16x FireWire/USB 2.0 DVD±RW

While CPU, memory, OS and other variables don't often make a huge difference, there are some nonetheless. We have a computer that is used only for testing hardware. We do this so all tests can be compared reliably.

Test System:

For DVD writers the performance tests are broken down into four sections: CD read, CD write, DVD read and DVD write tests. Each benchmark test has been run three times. The score given is an average of the three. DMA has been enabled in device manager for all IDE devices supporting it.

CD Read Tests: For the read performance section of the CD-ROM benchmarks, CD WinBench 99 v3.0 and CD Speed v4.70 are used to test read speeds, seek times and CPU usage. For DAE testing both CD Speed and CD DAE are used. CD Speed is used to give an overall DAE speed rating and CD DAE is used to give the track by track extraction speeds and to check the extracted tracks for errors the drive may have created.

CD Write Tests: To test the write speeds, Nero Burning Rom is used to write 700MB to our test media. Times are recorded. To test rewrite scores, Nero is used again to time how long it takes to write 400MB of random files and directories. Then Sonic's DLA is used to test packet writing speeds. The same files are copied and pasted in Windows Explorer and timed.

DVD Read Tests: For the read performance section of the DVD benchmarks CD Speed v4.70 is used to test read speeds, seek times, and CPU usage.

DVD Write Tests: To test the DVD write speeds, Nero Burning Rom is used to write 4GB to our test media. Times are recorded. Then Sonic's DLA is used to test packet writing speeds. The same files are copied and pasted in Windows Explorer and timed.

As I pointed out earlier, the PX-755UF has both FireWire and USB 2.0 connectors. To save time, our tests have been run using USB 2.0.

CD Winbench 99 Scores:

The CD Winbench test is as close as we can get to testing every day usage. It fires off eight different applications using scripts. This tries to mimic the activities of a person loading these programs onto their own computer.

Plextor's new DVD writer performed very well in our CD Winbench tests. In the transfer rate tests, the PX-755UF started reading at 23.7x (3400 / 150) on the inside and reached a maximum speed of about 46.4x (6960 / 150) on the outside. This resulted in a very good overall CD Winbench score.

CD Speed v4.70 - Pressed CD:

For this test I used a pressed CD containing one Mode 1 data track. The disc is 74:38 in size and is full of data and directories.

SpeedRead Enabled

SpeedRead Disabled

	Plextor PX-755UF	ASUS DRW-1608P3S	LG GSA-H10N	Lite-On SHM-165H6S
Transfer Speed Average: Start: End:	36.76x 21.29x 48.61x	31.61x 18.12x 41.49x	35.57x 20.42x 46.78x	36.68x 21.95x 48.50x
Seek Times Random: 1/3: Full:	94ms 114ms 169ms	113ms 129ms 202ms	114ms 130ms 175ms	103ms 116ms 168ms
CPU Usage 1x: 2x: 4x: 8x:	0% 1% 2% 6%	0% 1% 2% 4%	1% 1% 3% 21%	2% 4% 7% 12%

PX-755UF performed very well when reading pressed CD's. With SpeedRead enabled, the drive had no problems reading our test disc at 48x. Looking at the other scores, you can see that its seek times and CPU usage were also quite good.

CD Speed v4.70 - CD-R Media:

For this test I made a copy of our pressed test CD. I used 12x rated Memorex Gold 74 minute media for the tests.

The PX-755UF was a little slower when reading CD-R media. While it still had no problems reaching its rated speed, it wasn't as fast as the SHM-165H6S this time around. Nevertheless, its seek times were again quite good.

Plextor's new DVD writer had no problems recognizing our 99 minute CompUSA media. With SpeedRead enabled, the PX-755UF read our test disc from start to finish, reaching a maximum transfer speed of 48.48x.

The PX-755UF slowed down considerably when reading discs recorded with GigaRec. As you can see, the drive had a maximum read speed of only 8x when reading these discs.

CD Speed v4.70 - CD-RW Media:

For this test I made a copy of a pressed test CD. I used some PNY 80 minute CD-RW media for the tests.

The PX-755UF's CD-RW read speeds were limited to only 40x, even with SpeedRead enabled. Nevertheless, the drive had no problems exceeding this speed in CD Speed's transfer rate tests and its seek times were again very good.

CD DAE and CD Speed v4.70 - Pressed CD:

For this test I used Pure Funk. The CD is almost exactly 74 minutes. This helps to squeeze the maximum performance out of the CD.

Exact Audio Copy can tell us a lot about a drive's capabilities. You can see from the screen shot that the Plextor PX-755UF supports accurate stream, caches audio data and has the ability to retrieve C2 error information from audio CD's.

CD Speed	Plextor PX-755UF	ASUS DRW-1608P3S	LG GSA-H10N	Lite-On SHM-165H6S
Average: Start: End: DAE Quality: Accurate Stream:	31.35x 18.02x 41.48x 10 Yes	31.15x 18.77x 41.38x 10 Yes	30.73x 17.95x 40.68x 10 Yes	37.03x 21.26x 48.93x 10 Yes

The PX-755UF did fairly well in our DAE tests. While not nearly as fast as the drive from Lite-On, it hadno problems ripping pressed audio CD's at 41x.

To get a better look at the quality of the extracted audio we use CD DAE. CD DAE is actually designed to be an audio ripping program. It converts the CD-DA on the CD to .wav files. We use it in our testing because it can also be used as a quick and easy way to test the quality. Where CD Speed tests the DAE as one large session, CD DAE extracts each CD track individually. It actually extracts each track twice and then compares them to check for any errors. Every error a drive creates could be a hiss or pop you would hear later in the audio tracks.

While the PX-755UF started out fairly quick when extracting our test CD with CD DAE, its average and maximum speeds were slower than what we saw with CD Speed.

CD DAE and CD Speed v4.70 - CD-R Media:

For this test I used a copy of the Pure Funk CD. It's burned onto the same Memorex Gold 74 minute media I used in the CD Speed tests.

The PX-755UF was slightly faster when ripping audio CD-R discs. Unfortunately, even with this increase in speed, it wasn't nearly as fast as the Lite-On SHM-165H6S. So how did it do in CD Speed's advanced DAE tests? Take a look below.

Plextor's new DVD writer completed CD Speed's advanced DAE tests with an average score of 29.93x. The drive had no problems passing all of the on-the-fly tests and did not create any errors. In the advanced tests, the PX-755UF was able to read the CD-Text and subchannel data as well as the lead in and lead out sections of the CD.

To see how well Plextor's DVD writer can read scratched and dirty discs, I used CD Speed's ScanDisc utility to see how many sectors were damaged or unreadable. This is a very rough, but good way to test the drive's error correcting abilities.

CD Speed - ScanDisc

The PX-755UF handled scratched discs relatively well. By looking at the screenshot, you can see that the drive considered only 68.7% of the CD to be "damaged". More importantly, none of the sectors on the disc were unreadable.

You can also get an idea of how well the drive can read scratched and dirty discs by using CD DAE. CD DAE will extract the audio tracks twice and then compare them. From this information we can see what the drive's average speed was and how many errors it generated.

The PX-755UF gave some mixed results in this test. While the scratches on the disc didn't slow the drive down very much, the number of errors was higher than what we'd like to see.