Messages in this thread | | | Date | Sat, 17 Feb 2007 18:26:42 +0000 | From | Joel Soete <> | Subject | Re: 2.6.20-rc6 libata PATA ATAPI CDROM is not working |
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[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)?
Cheers, Joel - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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