Hi !
(Following an advice from someone at freebsd-questions@, this is a repost of a question asked at freebsd-questions@)
I'm currently using FreeBSD 4.10 on an HP D530 SFF. The system is perfectly stable except for the following problem I'm unable to understand :
When I mount a cdrom (mount /cdrom), then calculate the MD5 hash of a big file on a CD (md5 /cdrom/bigfile), the results are often random: unmounting, mounting again and calculating again the MD5 often result in a different value. What disturb me the most is that absolutely no errors are reported in any log (no read errors for example).
I thought the CDROM reader, a LITE-ON LTR-48327S PQS3, was the culprit,
so I replaced it with a PLEXTOR DVDR PX-712A and got the exact same results (i.e. random MD5 values). I checked the RAM using memtest and
got no errors. The problem does not occur for files on the harddisk.
hw.ata.atapi_dma is set since both drives support it and it seems to be required for proper CD/DVD burning. The CD drive is the master on its own ATA bus.
While the problem occurs on multiple CDs (mostly RW), to my surprise, I was not able to reproduce the problem by reading big files on DVDs.
Could someone provide me a hint on what to check next or how to fix this problem ? Can errors on CDs generate such a behavior ?
Thank you very much in advance,
Regards,
Jean-Sebastien
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