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:
| CPU: | AMD Athlon 64 X2 4600+ 2.4GHz | |
| Motherboard: | ASUS M2N-SLI Deluxe with BIOS 0304 | |
| Memory: | Corsair TWIN2X2048-6400 | |
| Video Card: | MSI NX7900GT-T2D256E - ForceWare v93.71 | |
| Hard Drive: | Seagate Barracuda 7200.10 SATA 3.0Gb/s 320GB | |
| Operating System: | Windows XP SP3 - NVIDIA nForce v9.16 |
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 and CD Speed are used to test transfer speeds, access times and CPU usage. For DAE testing, CD Speed is used to give an overall speed rating and is used in combination with CD DAE to see how well a drive reads scratched and dirty discs.
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 Roxio's Drag-to-Disc 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 is used to test read speeds, access times, and CPU usage.
DVD Write Tests: To test the DVD write speeds, Nero Burning Rom is used to write a 4.38GB image to our test media. Times are recorded. Then Roxio's Drag-to-Disc is used to test packet writing speeds. For this, 4GB of random files and directories are copied and pasted in Windows Explorer and timed.
CD Winbench 99 Scores:
| Sony DRX-S90U | |
| CD Winbench 99 | 1365 KB/sec |
| Transfer Rate: Inside | 1570 KB/sec |
| Transfer Rate: Outside | 3400 KB/sec |
| Random Access Time | 127ms |
| CPU Utilization | 0% |
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.
Sony's new portable DVD writer performed fairly well in the CD Winbench portion of our tests. In the transfer speed tests, the drive started reading at about 10.5x on the inside of the CD and was able to reach 22.7x on the outside of the disc. As you can see, this resulted in a very good overall CD Winbench score.
CD Speed v4.7.7.16 - 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.
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Transfer Speed | Access Times | CPU Usage | |||||||
| Average | Start | End | Random | 1/3 | Full | 1x | 2x | 4x | 8x | |
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Sony DRX-S90U |
18.93x | 10.89x | 25.03x | 135ms | 158ms | 237ms | 1% | 1% | 3% | 6% |
The DRX-S90U performed a little better in our CD Speed tests. The drive started reading at 18.93x and quickly accelerated, reaching a maximum transfer speed of 25.10x. Unfortunately, its access times were a little higher than we'd like to see.
CD Speed v4.7.7.16 - 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.
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Transfer Speed | Access Times | CPU Usage | |||||||
| Average | Start | End | Random | 1/3 | Full | 1x | 2x | 4x | 8x | |
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Sony DRX-S90U |
18.95x | 11.01x | 25.00x | 140ms | 162ms | 249ms | 1% | 2% | 3% | 6% |
The DRX-S90U was a little faster when reading CD-R media. Thanks to this speed boost, the drive was able to reach a maximum transfer speed of 25.70x.
Sony's portable DVD writer had some trouble reading our 99 minute CompUSA media. If the session on the CD was larger than 90 minutes in size, the DRX-S90U would not recognize the disc correctly. The drive also slowed considerably when reading the disc back. As you can see, it reached a maximum transfer speed of only 10.85x.
CD Speed v4.7.7.16 - 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.
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Transfer Speed | Access Times | CPU Usage | |||||||
| Average | Start | End | Random | 1/3 | Full | 1x | 2x | 4x | 8x | |
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Sony DRX-S90U |
19.00x | 10.99x | 25.09x | 142ms | 166ms | 249ms | 1% | 1% | 3% | 6% |
The DRX-S90U also reads CD-RW media at 24x. As you can see, it had no problems reaching this speed in our tests.
CD Speed v4.7.7.16 (DAE) - 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 while the Sony DRX-S90U supports accurate stream, caches audio data and has the ability to retrieve C2 error information from audio CD's.
| CD Speed | Average | Start | End | Quality | Accurate Stream |
| Sony DRX-S90U | 19.12x | 11.04x | 25.25x | 10 | Yes |
For a portable drive, the DRX-S90U did very well in our DAE tests. The drive started out at 11.04x and reached a maximum speed of 25.25x.
CD Speed v4.7.7.16 (DAE) - 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.
| CD Speed | Average | Start | End | Quality | Accurate Stream |
| Sony DRX-S90U | 18.94x | 11.04x | 24.97x | 10 | Yes |
The DRX-S90U was a little slower when extracting audio from CD-R media. This time around, it reached a maximum DAE speed of 24.97x. So how did it do in CD Speed's advanced DAE tests? Take a look below.
Sony's portable DVD writer completed CD Speed's advanced DAE tests with an average score of 18.02x. While the drive was able to go through the tests without creating any errors, it was unable to pass all of the on the fly copying tests. If you look at the advanced features, you can see that the DRX-S90U was able to read the CD-Text and subchannel data but failed to read the lead in and lead out sections of the CD.
