> And may the source be always with you ...
>
> Here is the new part of the man page:
Thanks! Makes good sense.
I ran into a very interesting result while trying this feature
out, using my IDE/ATAPI drive under SCSI emulation. The first
CD I tried reported some C2 errors:
radagast:~$ readcd dev=1,0,0 --c2scan
Capacity: 296830 Blocks = 593660 kBytes = 579 MBytes = 607 prMB
Sectorsize: 2048 Bytes
Copy from SCSI (1,0,0) disk to file '/dev/null'
end: 296830
C2 in sector: 179819 first at byte: 160 (0xF0) total: 2168 errors
C2 in sector: 179820 first at byte: 0 (0xFF) total: 376 errors
C2 in sector: 224619 first at byte: 1102 (0x02) total: 524 errors
C2 in sector: 224620 first at byte: 4 (0x0F) total: 1559 errors
C2 in sector: 224621 first at byte: 0 (0xF0) total: 156 errors
addr: 296830 cnt: 28
Time total: 406.963sec
Read 767004.08 kB at 1884.7 kB/sec.
C2 errors total: 4783 bytes in 5 sectors on disk
C2 errors rate: 0.000685%
So did the second CD:
radagast:~$ readcd dev=1,0,0 --c2scan
Capacity: 232267 Blocks = 464534 kBytes = 453 MBytes = 475 prMB
Sectorsize: 2048 Bytes
Copy from SCSI (1,0,0) disk to file '/dev/null'
end: 232267
C2 in sector: 179819 first at byte: 112 (0xF0) total: 2216 errors
C2 in sector: 179820 first at byte: 0 (0xFF) total: 328 errors
C2 in sector: 224619 first at byte: 694 (0x02) total: 800 errors
C2 in sector: 224620 first at byte: 2 (0x3F) total: 2166 errors
C2 in sector: 224621 first at byte: 0 (0xFC) total: 650 errors
addr: 232267 cnt: 13
Time total: 341.478sec
Read 600174.30 kB at 1757.6 kB/sec.
C2 errors total: 6160 bytes in 5 sectors on disk
C2 errors rate: 0.001128%
and the errors are in the same place! The third CD showed
a very similar pattern:
radagast:~$ readcd dev=1,0,0 --c2scan
Capacity: 301237 Blocks = 602474 kBytes = 588 MBytes = 616 prMB
Sectorsize: 2048 Bytes
Copy from SCSI (1,0,0) disk to file '/dev/null'
end: 301237
C2 in sector: 224619 first at byte: 1270 (0x02) total: 444 errors
C2 in sector: 224620 first at byte: 4 (0x0F) total: 1701 errors
C2 in sector: 224621 first at byte: 0 (0xF0) total: 340 errors
addr: 301237 cnt: 79
Time total: 377.782sec
Read 778391.70 kB at 2060.4 kB/sec.
C2 errors total: 2485 bytes in 3 sectors on disk
C2 errors rate: 0.000351%
My guess is that this drive (a Toshiba XM-6402B) has a firmware
problem affecting Red Book operations, but I can't be sure of
that.
I tried re-testing one of the CDs in my Ricoh MP6201S CD-RW drive,
and it didn't work at all:
radagast:~$ readcd dev=0,2,0 --c2scan
Capacity: 301237 Blocks = 602474 kBytes = 588 MBytes = 616 prMB
Sectorsize: 2048 Bytes
readcd: Input/output error. mode select g1: scsi sendcmd: no error
CDB: 55 10 00 00 00 00 00 00 18 00
status: 0x2 (CHECK CONDITION)
Sense Bytes: 70 00 05 00 00 00 00 0A 00 00 00 00 26 00 00 00
Sense Key: 0x5 Illegal Request, Segment 0
Sense Code: 0x26 Qual 0x00 (invalid field in parameter list) Fru 0x0
Sense flags: Blk 0 (not valid)
cmd finished after 0.009s timeout 40s
Copy from SCSI (0,2,0) disk to file '/dev/null'
end: 301237
readcd: Input/output error. read_cd: scsi sendcmd: no error
CDB: BE 00 00 00 00 00 00 00 63 FA 00 00
status: 0x2 (CHECK CONDITION)
Sense Bytes: 70 00 05 00 00 00 00 0A 00 00 00 00 24 00 00 00
Sense Key: 0x5 Illegal Request, Segment 0
Sense Code: 0x24 Qual 0x00 (invalid field in cdb) Fru 0x0
Sense flags: Blk 0 (not valid)
cmd finished after 0.009s timeout 40s
readcd: Input/output error. Cannot read source disk
readcd: Retrying from sector 0.
.~~-~~~+~~~-~~~+~~~-~~~+~~~-~~~+~~~-~~~+~~~-~~~+~~~-~~~+~~~-~~~+~~~-~~~+~~~-~~~+~~~-~~~+~~~-~~~+~~~-~~~+~~~-~~~+~~~-~~~
readcd: Input/output error. Error on sector 0 not corrected. Total of 1 errors.
Other readcd operations on this drive also fail - I suspect that its
lack of true MMC compatibility is confusing readcd.
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