> [snip] > > > > Hmm, readcd was trying to read 279884 blocks, while cdrecord said it > > wrote 279882 blocks. > > > yes and seems to be always the same: > with new burned cd I got: > # ll /MultiCd/cd060213.iso > -rwxr-xr-x 1 root root 3213312 Feb 13 2006 /MultiCd/cd060213.iso > > i.e. 3213312/2048 == 1569 > > while: > readcd dev=/dev/hdd f=- | md5sum > Read speed: 1059 kB/s (CD 6x, DVD 0x). > Write speed: 353 kB/s (CD 2x, DVD 0x). > Capacity: 1571 Blocks = 3142 kBytes = 3 MBytes = 3 prMB > Sectorsize: 2048 Bytes > Copy from SCSI (1,1,0) disk to file '-' > end: 1571 > Errno: 0 (Success), read_g1 scsi sendcmd: no error > CDB: 28 00 00 00 06 00 00 00 23 00 > status: 0x2 (CHECK CONDITION) > Sense Bytes: > Sense Key: 0xFFFFFFFF [], Segment 0 > Sense Code: 0x00 Qual 0x00 (no additional sense information) Fru 0x0 > Sense flags: Blk 0 (not valid) > cmd finished after 0.014s timeout 40s > readcd: Success. Cannot read source disk > readcd: Retrying from sector 1536. > > so always Capacity == original image size + 2 ? > > [snip] > > > > There always seems to have been any issue with reading blocks from a cd > > getting broken by the kernel doing readahead and getting failures by > > trying to read past the end of the disc even though the user never asked > > it to. Sometimes your size just happens to hit a safe block size so the > > readahead doesn't break. > > > btw this tips: > readcd dev=/dev/hdd sectors=0-1569 f=- | md5sum > Read speed: 1059 kB/s (CD 6x, DVD 0x). > Write speed: 353 kB/s (CD 2x, DVD 0x). > Capacity: 1571 Blocks = 3142 kBytes = 3 MBytes = 3 prMB > Sectorsize: 2048 Bytes > Copy from SCSI (1,1,0) disk to file '-' > end: 1569 > addr: 1569 cnt: 33 > Time total: 5.436sec > Read 3138.00 kB at 577.3 kB/sec. > 6a1248783a21722816b972aa9bae9d5e - > > (adding sectors=0-1569 : 1569 being the size of the original image) > > seems to work fine > # md5sum /MultiCd/cd060213.iso > 6a1248783a21722816b972aa9bae9d5e /MultiCd/cd060213.iso > > >> is the same wrong results. > >> > >> mmm I always used successfully dd method at my office with scsi cdrom > >> drive > >> (even for bootable disk). > > > > Well it seems some disks can be read that way, others can not. > > > I would be curious to read same cd on scsi cdrom (at the office)? > well here are the results with the cd I burned at home and in a scsi cd rw drive: # dd if=/dev/rdsk/c1t4d0 bs=2048 | md5sum 1569+0 records in 1569+0 records out 6a1248783a21722816b972aa9bae9d5e -
and also with readcd but an older release: # readcd -version readcd 1.11a19 (hppa1.1-hp-hpux11.00) Copyright (C) 1987, 1995-2002 Jörg Schilling # readcd dev=1,4,0 f=- | md5sum Capacity: 1569 Blocks = 3138 kBytes = 3 MBytes = 3 prMB Sectorsize: 2048 Bytes Copy from SCSI (1,4,0) disk to file '-' end: 1569 addr: 1569 cnt: 19 Time total: 6.239sec Read 3138.00 kB at 503.0 kB/sec. 6a1248783a21722816b972aa9bae9d5e - I am very confused: cdrecord finaly do well its job on ide drive but what went wrong for the check (cdrom drive? (but I don't have another model to test) or some code in the kernel? (I don't think to have a small chance to put this ide drive on a *nix system which could support ide and scsi hw)). Any idea? Cheers, Joel > > --- Scarlet One Unlimited Free national calls, surf up to 6 Mbit/s, 50 GB download volume For only EUR 49,95 per month. No Belgacom subscription needed. All in! http://www.scarlet.be - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/