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Home > Hardware Reviews > Optical Storage > CD-RW External

Thursday, July 25, 2002
Plextor PX-208T

3. CD Error Correction tests

Plextor PX-208T combo CDRW/DVD - Page 3

CD Error Correction tests

In the following tests we examine the error correction capabilities of Plextor PX-208T. We use the built-in Nero CD Speed v0.99.3 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

Our tests did not show any of the above negative behaviors from the Yamaha CRW-F1.

- 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)

Nero CD Speed showed that the drive gave 1178633 read errors during the reading process. The read errors occurred when the size of the errors on the disc became large enough, and continue until the end of the disc.

- 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.

Plextor PX-280T gave some read errors in the artificially interrupted areas of the disc, and also in the wide black dot spot.

- 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 drive did not have any reading problems with the specific disc. The reading speed was gradually increased as the drive reached to the end of the written data, at 60min.




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