cdrom troubleshooting

From: Bob Simon (bobneworleans_at_yahoo.com)
Date: 03/29/04 

Date: 29 Mar 2004 13:45:43 -0800

How does one go about troubleshooting problems with a cdrom drive
and/or IDE/ATAPI subsystem? The following are a sample of some of the
messages I see in /var/log/messages:

Mar 29 15:01:16 marvin kernel: hdc: irq timeout: status=0xd0 { Busy }
Mar 29 15:01:16 marvin kernel: hdc: ATAPI reset complete
Mar 29 15:01:26 marvin kernel: end_request: I/O error, dev 16:00
(hdc), sector 1290220
Mar 29 15:12:24 marvin kernel: hdc: cdrom_decode_status: status=0x51 {
DriveReady SeekComplete Error }
Mar 29 15:12:24 marvin kernel: hdc: cdrom_decode_status: error=0x30

I removed the drive to verify that it is jumpered as master.