mount error

[bjlockie]

I'm trying to mount an audio cd that has data on it as iso9660.
Some times it works find and some time it gives the error:

# mount /mnt/cdrom-ide
mount: Not a directory

/etc/fstab:
/dev/sr1 /mnt/cdrom-ide iso9660 noauto,ro 0 0

dmesg (with fs iso9660):
I/O error: dev 0b:01, sector 0
FAT: unable to read boot sector
ISO 9660 Extensions: Microsoft Joliet Level 1
SCSI cdrom error : host 1 channel 0 id 0 lun 0 return code = 28000000
Current sd0b:01: sense key Hardware Error
Additional sense indicates Logical unit communication CRC error (Ultra-DMA/32)
I/O error: dev 0b:01, sector 922052
ISOFS: unable to read i-node block
ISOFS: changing to secondary root
SCSI cdrom error : host 1 channel 0 id 0 lun 0 return code = 28000000
Current sd0b:01: sense key Hardware Error
Additional sense indicates Logical unit communication CRC error (Ultra-DMA/32)
I/O error: dev 0b:01, sector 922108
ISOFS: unable to read i-node block

[474]

A CRC error could be caused by a damaged CD, or even a faulty drive. Perhaps it could be caused by using hdparm (or /proc) to set DMA settings that are above and beyond its capabilites (or even because of a dodgy IDE controller). You could try setting it for a PIO mode instead of DMA to see if you get the same problems, and not unmasking the IRQ and so forth. It seems as though you're using SCSI emulation so hdparm probably isn't going to work anyway. In that case, see my post in Tips/Tricks about SCSI kernel emulation for some info on how to achieve the same effects using the /proc interface.