CDROM problems in fc3 (was Re: What I hope is not in FC3

Paul Johnson pauljohn at
Tue Nov 9 19:39:11 UTC 2004

I have been asking around about my laptop, which can write cdroms but 
can't mount them unless I boot with the (deprecated) kernel option:


I'm trying to connect the dots between my trouble and the one that Mr 
Cox mentions below.  Are they the same?

My problem is described here:

The short and sweet is that CDs fail to mount and the message (over and 
over again) is:

kernel: hdc: irq timeout: status=0xd0 { Busy }
kernel: hdc: irq timeout: error=0xd0LastFailedSense 0x0d
kernel: hdc: DMA disabled
kernel: hdc: ATAPI reset complete

cdroms will not mount at all. If I do use the ide-scsi option, they will 
mount, but the message log has a deprecation warning in it and I'm 
advised to use ide-cd instead.  But that doesn't work.  And I've read 
people saying that cd writing is bad with ide-scsi.

What is a person supposed to do?

Replace hardware?

My CD-DVD+RW device is found at startup as

hdc: _NEC DVD+RW ND-5100A, ATAPI CD/DVD-ROM drive


Alan Cox wrote:
> On Tue, Nov 09, 2004 at 08:23:54AM +0000, Michael A. Peters wrote:
>>>yet fixed and its not trivial to fix or it would have been fixed by
>>Say - is this why md5sum /dev/cdrom doesn't work anymore?
> Correct.
>>I use to be able to verify that a CD burned correctly by running md5sum  
>>on the cdrom device and comparing that with the md5sum of the iso image  
>>- but that hasn't worked for me for awhile (I/O error I believe)
> 2.4.x works 2.6.x doesnt. Upgrade to the ide-scsi driver and it will work
> as will eject.

Paul E. Johnson                       email: pauljohn at
Dept. of Political Science  
1541 Lilac Lane, Rm 504
University of Kansas                  Office: (785) 864-9086
Lawrence, Kansas 66044-3177           FAX: (785) 864-5700

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