detail information

A new test we're now going to do is with Lite-On's C1/C2 error scan program called WSES. This program can accurately scan a disc for errors and it's a better method of checking the write quality then when using Nero CD Speed for instance. For the quality tests we wrote several different CD-Recordable media and then measured the C1/C2 errors from the disc. The created disc was scanned using a Lite-On LTR-48125W drive (WSES only works with Lite-On drives) at 40X reading.

Introduction:

C1 and C2 errors are not really on a disc. They occur during reading. The more difficult it is for a drive to read a disc, the more errors will occur while reading that disc. A good disc should report low error rates even at high scanning speeds. But don't forget that a bad disc can also have low error rates after burning. A good disc will still report low error rates if you put the disc into direct sunlight, while a bad disc will damage and/or may degrade after some months. The results below are thus not an indication whether or not the used disc is of a good quality. It's merely an indication if the burn process was done properly.

In the figures below you will see a graphical overview of errors occurring during the read process. Please note that every created/burned disc will always have C1 errors. These are errors that are corrected by the drive and they will not effect the disc in a bad way as long as their amount is limited. C2 errors are however very bad for a disc and are harder to read and correct. When there are too many C2 errors present on the disc it means you have bad burned disc and it can't be read in the test drive your using as a reader (a coaster). Although a low amount of C2 errors can still be recovered by the drive, a zero amount of C2 errors is always preferred!

The Tests:

700MB MMORE CD-R80:

• Contents: Data
• Certified Speed: 32X
• Write Speed: 44X (3m:04s)
• Disc Type, Material: CD-R, Phthalocyanine
• ATIP Lead-in: 97m 17s 06f
• Nominal Capacity: 702.83MB (79m 59s 74f)
• Disc Manufacturer maybe: India, MoserBaer

Disc can be read fine. There are no C2 errors and the amount of C1 errors is limited. This is thus a good burn done at 44X:

700MB Discplanet Media:

• Contents: Data
• Certified Speed: 16X
• Write Speed: 16X (5m:27s)
• Disc Type, Material: CD-R, Cyanine
• ATIP Lead-in: 97m 15s 11f
• Nominal Capacity: 702.83MB (79m 59s 74f)
• Disc Manufacturer maybe: Ritek

Disc can be read fine. There are no C2 errors and the amount of C1 errors is this time very limited. This is thus also a good burn done at 16X, the certified speed of the media:

700MB Hi-Space Metal:

• Contents: Data
• Certified Speed: 24X
• Write Speed: 40X (3m:16s)
• Disc Type, Material: CD-R, Phthalocyanine
• ATIP Lead-in: 97m 25s 07f
• Nominal Capacity: 702.69MB (79m 59s 00f)
• Disc Manufacturer maybe: MPO, France

Disc can be read fine. There are no C2 errors and the amount of C1 errors is limited. This is a good burn done at 40X while the disc was certified for 24X:

700MB Nashua:

• Contents: Data
• Certified Speed: 12X
• Write Speed: 16X (5m:33s)
• Disc Type, Material: CD-R, Phthalocyanine
• ATIP Lead-in: 97m 16s 06f
• Nominal Capacity: 702.83MB (79m 59s 74f)
• Disc Manufacturer maybe: Memorex Black

Although the disc can be read fine there are a lot of C1 errors on the disc. Notice that the display scale is now 300 instead of the normal 60 (above the red arrow). The Nashua media is quite old and was certified for 12X writing. The Yamaha wrote it at 16X. There are no C2 errors on the disc so it can still be read ok:

650MB Taiyo Yuden:

• Contents: Data
• Certified Speed: 40X
• Write Speed: 40X (2m:59s)
• Disc Type, Material: CD-R, Cyanine
• ATIP Lead-in: 97m 24s 01f
• Nominal Capacity: 656.40MB (74m 43s 01f)
• Disc Manufacturer maybe: Taiyo Yuden

Disc can again be read fine. There are no C2 errors and the amount of C1 errors is limited. More errors than with the Discplanet Media discs, less than with the MMORE discs. Another good burn done at 40X:

700MB Maxell:

• Contents: Audio, 74 minutes
• Certified Speed: 40X
• Write Speed: 40X (3m:04s)
• Disc Type, Material: CD-R, Phthalocyanine
• ATIP Lead-in: 97m 25s 29f
• Nominal Capacity: 702.83MB (79m 59s 74f)
• Disc Manufacturer maybe: Maxell

And the last disc we've tested can also be read just fine. There are no C2 errors and the amount of C1 errors is again limited. Another successful burn done at 40X, the certified speed of the media:

Conclusion:

Judging from the results we got with discs burned at full speed using the Yamaha CRW-F1 drive we can say all discs were written without any problems and had no serious errors on them. All discs could be read just fine and they all had a little amount of C1 errors. Not one disc had C2 errors which is of course a good thing. It seems the lack of supported write speeds is thus no problem for the Yamaha CRW-F1 drive since it does a pretty good job in deciding the best write speed for the used media.

Note that from the media we tested only the MMORE discs could be written at 44X. They also had the most amount of C1 errors on them (except for of course the Nashua media). The amount was limited so this is no problem at all. The least amount of errors were found on the Discplanet Media CD-R's but these discs were also written at a low speed (16X). All discs could be read fine after they were burned.

Now that we've finished our read, write and quality tests, it's time to test the drive for its ability to read data and audio copy-protections.

Writing Tests

Protected Data