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Home > Hardware Reviews > Optical Storage > 48x CD-RW

Wednesday, September 11, 2002
CyberDrive CW088D

3. CD Error Correction

CyberDrive CW088D IDE CD-RW - Page 3

CD Error Correction tests

In the following tests we examine the error correction capabilities of CyberDrive CW088D. We use the built-in Nero CD Speed v1.0 CD Quality test. The reference test media come from ALMEDIO and Philips corporations.

- ABEX TCD-714R

This test disc has been produced for measuring and adjusting the tracking servo characteristics of the drive, against the eccentricity of compact disc. The fundamental characteristics of this disc other than on eccentricity are compatible with the standards in "Red Booklet".

The test examines the ability to trace eccentricity of the compact disc player. In reference to a zero eccentricity disc, we check the following phenomena:

a. There is skipping of sound tracks
b. Requires excess time to locate or cannot locate the starting point of the tune.
c. Mechanical noise is heard from the CD player
d. Requires excess time to read or cannot read the TOC information
e. The spindle motor runs wild

Physical characteristics of disc:

Eccentricity: 280 micro meters
Deviation: 3 micro meters

CyberDrive behaved in a very strange way in this test. The error rate is extremely high and definitely cannot reflect the real error correction capabilities of the drive. As it seems, there is an incompatibility between the CDSpeed implementation of ABEX TCD-714R and the way the CyberDrive CW088D retrieves C2 errors.

- ABEX TCD-721R

This test disc is produced with the objective of measuring and adjusting the CD player's tracking servo characteristics and error correction ability against scratches on the disc. Artificial scratches with lengths from 1.8 mm to 3.0 mm are found on the disc. The phenomenon that may occur during playback of the disc contents are:

a. Noise is created
b. The sound skips
c. The same section is repeatedly played
d. Start of the tune cannot be detected
e. The spindle motor rotates erratically (reverse rotation, change in revolution, e.t.c)

The same behavior as in the previous test is showed here. This time, the drive reduced the reading speed in some hard to read areas, but again the amount of errors marked is unduly high.

- ABEX TCD-726

This disc is produced for measurement and adjustment of error ability and tracking / focusing servo characteristics of a CD player against defects included in some discs. Three kind of defects, interruption, black dots and fingerprints are prepared in this disc. The interruption defects are sized from 0.5 mm to 1.0 mm. The black dots are from 0.4 mm to 1.0 mm. Lastly, the fingerprints are from 65 to 75 micro meters.

- PHILIPS SBC-444A

Another test disc that comes from Philips. The purpose of this disc is adjustment / checking of the CD player. Note that the disc is not within specification concerning local defects. The defects found on the disc are interruptions of the information layer, black dots at out-read area, and simulated fingerprint.

The situation remains the same in the ABEX TCD-726 and Philips SBC-444A. The errors occur from the beginning of the test and we should not take these results as a reference for the drive's performance.




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