Activeforever Plextalk PTR2 Digital DAISY Player and Recorder - Manual (Page 221)

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Symptom: Traces of writing are visible on the recording surface despite
the fact that the data on the CD-RW has been erased.
Possible cause: This is not a problem.
Solution: Once a CD-RW is written, there are traces of the writing, even if it
is erased.
Symptom: Nothing can be added to the media.
Possible cause 1: There is not enough space in the disc for added data.
Solution: The information capacity for writing to a CD-R or CD-RW is 650
MB for a Type 74 disc. This includes the table of contents and read in and
read out data. If the free capacity is insufficient to add the data, you
should use a blank CD-R or CD-RW disc.
Possible cause 2: The CD-R or CD-RW was previously written to by a CD-R
or CD-RW drive of another company.
Solution: Use CD-R or CD-RW discs that have been written to by PLEXTALK.
Possible cause 3: The CD-R or CD-RW was written using "Disc-at-once" or
was closed after writing by "Track-at-once".
Solution: You are unable to add data to these discs. You should use a
blank CD-R or CD-RW disc.
Symptom: Previous sessions of the media which were written two or
more times cannot be read.
Possible cause 1: The previous session could not be read due to the
writing software used.
Solution: A CD-R or CD-RW that has been written, in a state where the
previous session was not read by the writing software, can in principle
only have the final session read. When the data is written, the second or
more read the previous session and write as a multi-session. The data
session written previously is closed, preventing the reading of the added
session. Rewrite the data to a blank CD-R or CD-RW.
Possible cause 2: The CD-R or CD-RW is of poor quality.
Solution: Check for dirt, fingerprints or scratches on the surface of the disc.
If necessary, carefully clean the disc using the soft cloth provided.
Possible cause 3: The CD has been inserted upside down.
Solution: Eject the CD and reinsert it the correct way up.
Symptom: Read error has occurred.
Possible cause 1: The CD-R or CD-RW is of poor quality.
Solution: Check for dirt, fingerprints or scratches on the surface of the disc.
If necessary, carefully clean the disc using the soft cloth provided.
Possible cause 2: The CD has been inserted upside down.
Solution: Eject the CD and reinsert it the correct way up.