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SubjectRe: CD-ROM I/O error: dev 0b:00, sector 843150
From writes:
: Herbert Rosmanith:
: : does the above message mean that the cdrom (the disk, not the drive)
: : is defective ?
: : I get a lot of this messages after dd if=/dev/scd0 of=/dev/null:
: : scsi0 channel 0 : resetting for second half of retries.
: ...
: : Additional sense indicates Random positioning error
: : CD-ROM I/O error: dev 0b:00, sector 843138
: : the bad thing is that I cannot ^C the process doing dd nor kill -9 it,
: : so it's stuck somewhere in the kernel.
: Interesting how suddenly everybody has the same complaint.
: Use the raset that I posted recently to set the read ahead to 0
: and the problems are gone. (But the CD becomes very slow.)
: So, no, neither your disk nor your drive are defective,
: it is just the kernel that does not handle errors very elegantly yet.

Oddly enough, When I do this little test, I get kernel panics, Corrupted
Stack pages, all sorts of fun stuff. I have an NEC 6Xi on an NCR 53c810.
It's fairly reproducable, and only seems to happen if I have the CDROM
mounted when I do this, and happens every "once and a while" if I don't have
the CDROM mounted.


Everyone should know of all information that others have deemed unfit for
public knowledge. -Author Unknown | <>

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