Justin Conover írta:
Seeing the following in dmesg referring to my dvd drive when I try and
play something:
end_request: I/O error, dev sr0, sector 205572
Buffer I/O error on device sr0, logical block 51393
Buffer I/O error on device sr0, logical block 51394
Buffer I/O error on device sr0, logical block 51395
Buffer I/O error on device sr0, logical block 51396
Buffer I/O error on device sr0, logical block 51397
Buffer I/O error on device sr0, logical block 51398
Buffer I/O error on device sr0, logical block 51399
Buffer I/O error on device sr0, logical block 51400
Buffer I/O error on device sr0, logical block 51401
Buffer I/O error on device sr0, logical block 51402
Do you also get scary messages about hardware errors, too,
like CRC errors during DMA transfer? If not, then your disk
may be broken or just dusty. Look for small spot(s) on the
data side, you may wash it off with warm soapy water :-)
However if you get CRC errors in the log too, I have to tell that
I got similar errors when booting the Fedora 8 install disk.
I had to work it around with using the "libata.dma=1" option
on boot. This only enables DMA for harddisks but not for
ATAPI devices. My ODD is a Pioneer 111 reflashed to
the Buffalo 1.28 firmware so it can burn Labelflash labels, too.
The downside is that it reports max. usable UDMA66 about itself
but I had to limit it to UDMA44 to have stable DMA transfer despite
using an 80-wire cable. It worked on Fedora 6 with "hdparm -X67"
but now Fedora 8 doesn't allow the same with pseudo-SCSI devices. :-(
However, replacing my IDE cable with another also 80-wire one
seems to have fixed it, at least the same F-8 DVD that produced
errors during installation with DMA, now it can be read back
entirely. (To re-enable DMA, initrd had to be rebuilt with
"options libata dma=1" commented out in modprobe.conf.)
