Mark Hull-Richter wrote:

I wrote a bunch of files to a backup DVD about two months ago and now neither of my drives will read it. I get mount errors from "not a directory" to something like "unrecognized file system type" and so on, usually after a really long wait and a notice about how the drive is write-protected (duh).

Here's what happened most recently:

# mount /dev/hdc /mnt mount: block device /dev/hdc is write-protected, mounting read-only mount: wrong fs type, bad option, bad superblock on /dev/hdc, missing codepage or other error In some cases useful info is found in syslog - try dmesg | tail or so # dmesg | tail -40 hdc: cdrom_decode_status: status=0x51 { DriveReady SeekComplete Error } hdc: cdrom_decode_status: error=0x40 { LastFailedSense=0x04 } ide: failed opcode was: unknown hdc: cdrom_decode_status: status=0x51 { DriveReady SeekComplete Error } hdc: cdrom_decode_status: error=0x40 { LastFailedSense=0x04 } ide: failed opcode was: unknown hdc: cdrom_decode_status: status=0x51 { DriveReady SeekComplete Error } hdc: cdrom_decode_status: error=0x40 { LastFailedSense=0x04 } ide: failed opcode was: unknown hdc: ide_intr: huh? expected NULL handler on exit hdc: ATAPI reset complete end_request: I/O error, dev hdc, sector 5118720 Buffer I/O error on device hdc, logical block 639840 hdc: cdrom_decode_status: status=0x51 { DriveReady SeekComplete Error } hdc: cdrom_decode_status: error=0x40 { LastFailedSense=0x04 } ide: failed opcode was: unknown hdc: cdrom_decode_status: status=0x51 { DriveReady SeekComplete Error } hdc: cdrom_decode_status: error=0x40 { LastFailedSense=0x04 } ide: failed opcode was: unknown hdc: cdrom_decode_status: status=0x51 { DriveReady SeekComplete Error } hdc: cdrom_decode_status: error=0x40 { LastFailedSense=0x04 } ide: failed opcode was: unknown hdc: cdrom_decode_status: status=0x51 { DriveReady SeekComplete Error } hdc: cdrom_decode_status: error=0x40 { LastFailedSense=0x04 } ide: failed opcode was: unknown hdc: ide_intr: huh? expected NULL handler on exit hdc: ATAPI reset complete hdc: cdrom_decode_status: status=0x51 { DriveReady SeekComplete Error } hdc: cdrom_decode_status: error=0x40 { LastFailedSense=0x04 } ide: failed opcode was: unknown hdc: cdrom_decode_status: status=0x51 { DriveReady SeekComplete Error } hdc: cdrom_decode_status: error=0x40 { LastFailedSense=0x04 } ide: failed opcode was: unknown hdc: cdrom_decode_status: status=0x51 { DriveReady SeekComplete Error } hdc: cdrom_decode_status: error=0x40 { LastFailedSense=0x04 } ide: failed opcode was: unknown hdc: ide_intr: huh? expected NULL handler on exit hdc: ATAPI reset complete end_request: I/O error, dev hdc, sector 64 isofs_fill_super: bread failed, dev=hdc, iso_blknum=16, block=16

Is there any way to read what's on this DVD (so I can back -up the files again, hopefully with better results)?

Secondary related question: I noticed that my CentOS boot DVD does not automount when I put it in either drive - why is that?

Thanks.

mhr

I would suspect IDE cable, DVD drive, P/S, motherboard (assuming an on-board IDE channel) in that order. Don't overlook the drive's power connector, either.

Do you have another machine you can try that boot DVD in? Can you read a CD in the failing drive? Have you been monkeying around with the kernel? Is the "DVD drive" really a DVD drive or is it only for CDs?