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CD-Prüfen mit readcd

In der letzten Charge grml-CDs, die ich von meinem Bruder bedruckt bekommen habe, haben sich ein paar kaputte CDs reingeschlichen. Beim Booten der grml-CD bekommt man dann meistens SquashFS-Fehler und “dann geht nix mehr”. Um jetzt die schlechten von den guten[tm] CDs auszusortieren, habe ich readcd verwendet. So schaut das aus wenn es in Ordnung ist:

# readcd -c2scan dev=/dev/cdrom
Read  speed:  4234 kB/s (CD  24x, DVD  3x).
Write speed:  4234 kB/s (CD  24x, DVD  3x).
Capacity: 353867 Blocks = 707734 kBytes = 691 MBytes = 724 prMB
Sectorsize: 2048 Bytes
Copy from SCSI (0,0,0) disk to file '/dev/null'
end:    353867
addr:   353867 cnt: 38
Time total: 519.971sec
Read 914386.80 kB at 1758.5 kB/sec.
Total of 0 hard read errors.
C2 errors total: 0 bytes in 0 sectors on disk
C2 errors rate: 0.000000%
C2 errors on worst sector: 0, sectors with 100+ C2 errors: 0
#

Und die CD schmeisst man lieber weg, wenn man sowas zu sehen bekommt:

Read  speed:  4234 kB/s (CD  24x, DVD  3x).
Write speed:  4234 kB/s (CD  24x, DVD  3x).
Capacity: 353869 Blocks = 707738 kBytes = 691 MBytes = 724 prMB
Sectorsize: 2048 Bytes
Copy from SCSI (0,0,0) disk to file '/dev/null'
end:    353869
readcd: Success. read_cd: scsi sendcmd: no error
CDB:  BE 00 00 05 66 25 00 00 28 FA 00 00
status: 0x2 (CHECK CONDITION)
Sense Bytes: F0 00 25 00 05 66 4B 0A 00 00 21 00 64 00 00 00
Sense Key: 0x5 Illegal Request, Segment 0
Sense Code: 0x64 Qual 0x00 (illegal mode for this track) Fru 0x0
Sense flags: Blk 353867 (valid) illegal block length
resid: 105840
cmd finished after 0.030s timeout 40s
readcd: Success. Cannot read source disk
readcd: Retrying from sector 353829.
.......................................
readcd: Success. Error on sector 353867 not corrected. Total of 1 errors.
readcd: -noerror set, continuing ...
.
readcd: Success. Error on sector 353868 not corrected. Total of 2 errors.
readcd: -noerror set, continuing ...
C2 in sector: 353868 first at byte:  374 (0x02) total:  172 errors
addr:   353869
Time total: 594.388sec
Read 914391.97 kB at 1538.4 kB/sec.
Max corected retry count was 0 (limited to 10).
The following 2 sector(s) could not be read correctly:
353867
353868
Total of 2 hard read errors.
C2 errors total: 172 bytes in 1 sectors on disk
C2 errors rate: 0.000021%
C2 errors on worst sector: 172, sectors with 100+ C2 errors: 1

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