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cdrom was /dev/hdd now /dev/scd0. Can someone explain?

woody box with 2.4.9 kernel I compiled. I've been using this kernel since 23 Sep 2001. For over a year, /dev/cdrom has been linked to /dev/hdd, and "mount /dev/cdrom" worked with no problem. /etc/fstab entry is:
/dev/cdrom    /cdrom    iso9660   defaults,ro,user,noauto,exec    0  0

Tonight mount /dev/cdrom returned this error message:
mount: wrong fs type, bad option, bad superblock on /dev/hdd,
       or too many mounted file systems
       (could this be the IDE device where you in fact use
       ide-scsi so that sr0 or sda or so is needed?)

Looking at /var/log/dmesg and various entries in /proc I find that the last time I rebooted, my cdrom was identified as ide-scsi.

/var/log/dmesg says:
scsi1 : SCSI host adapter emulation for IDE ATAPI devices
  Vendor: HP        Model: COLORADO 8GB      Rev: 2.08
  Type:   Sequential-Access                  ANSI SCSI revision: 02
  Vendor: E-IDE     Model: CD-ROM 48X/AKU    Rev: U22
  Type:   CD-ROM                             ANSI SCSI revision: 02

The COLORADO is my tape drive and lilo.conf has always had append "hdc=ide-scsi" to get it to work. There is no such entry in lilo.conf about hdd.

To mount the cdrom I now need to mount /dev/scd0.

It's been about a month since the last time I did an apt-get install upgrade. I don't recall mounting cdrom since then until tonight. The only other thing that I can think of that may be pertinent is a couple of week ago I was trying to configure wine to play multimedia files (unsuccessfully), and wine kept giving me warning messages that I didn't have generic scsi devices sg, sg1,... So I looked up what these are in kernel documentation and created them with mknod.

Does anyone have an explanation why cdrom is now ide-scsi?


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