Are you sure it is being treated as an IDE device? 

I had a similar problem with my HP 8110 CD Writer. It is a IDE device, but
in order to use it as a writer, you have to do SCSI emulation, which then
makes it a SCSI device. Hence, it is no longer at /dev/hdd, but is instead
located on the scsi /dev's. 

I would look around and see if it is being detected someplace else. If I
remember correctly, it should be shown in /var/log/messages.

*********** REPLY SEPARATOR  ***********

On 3/6/00 at 12:04 PM Thomas, Leonard wrote:

>I am having abit of a problem mounting a zip disk on our machine.  The
drive is
>a Zip250
>IDE drive.  It is recognized  and mounted with out a problem under Redhat
5.2.
>After 
>upgrading to 6.1 I now get the following error message
>
>mount: /dev/hdd4 is not a valid block device
>
>I am trying to mount it as a vfat.  
>
>ideas as to the problem?
>
>Len Thomas
>thomasle@umkc.edu
>
>
>
>