Hi,
After upgrading to Red Hat 7.2 when I try to mount my cdrom drive I get:

mount: /dev/hdc is not a valid block device

I installed off the cdrom drive, the drive worked fine before the upgrade. I saw a few posts with this problem. Anyone know what's wrong?

when I do
dmesg | grep hdc

I get

hdc: driver not present

Maybe that'll help.

Thanks,
Matt

Is the CDROM really connected to /dev/hdc?

Meaning is it the Master drive on the secondary IDE controller?

Check your jumpers (or try to mount /dev/hdd and see if that works)


John

It is my understanding that Linux uses this naming practice to name the IDE devices:

hda - First IDE device (Usually primary hard disk)
hdb - Second IDE device
hdc - Third Device
hd.. - And so on to hdz ( If this really can happen I'm not sure.)


Your CD-ROM is probably hdb if you only have one hard disk.
So try mounting /dev/hdb
This probably a flaw in RedHat 7.2's detection mechanism.

Have Fun!

I know your pain. I am having the same problem and it is not because I don't know where my CDROM is connected or how redhat designates the devices. The CDROM is detected when I do the install but it goes away forever when I boot for the first time. Redhat 5.2 through 7.1 install and detect the drive just fine but 7.2 freaks out. It seems to detect it because if I list the contents of /proc/ide/hdb/model it tells me that I have an NEC CD-ROM Drive:273 (which is correct). However /proc/ide/hdb/driver just say (none). I thought it might have something to do with a DMA problem but I disabled DMA for the device and it didn't help. You might try adding the line:

/sbin/hdparm -d0 /dev/hdc

to your /etc/rc.d/rc.sysinit file. This is supposed to disable the DMA for the device. I read somewhere that this might help for some CDROMs (it didn't help me though). Good luck.

as root enter: depmod -ae

depmod was the magic. thanks.

another place to always check is your fstab. itll tell you what all of your devices mount points are.

jason

This link may help:
http://www.comptechdoc.org/os/linux/...ugdevices.html

I got nowhere with depmod -ae or any of the other fixes on the RedHat website. But moving my cdrom from the master on the 2nd IDE channel (dev/hdc) to the slave on the 1st channel (dev/hdb) did the trick.

I got 2 hard drives and an HP CDROM-Writer.

When I try to install Linux 7.2 I get the message that
my primary harddrive is hdc and my secondary harddrive is
hdf, whats going on here. Do I need change the physical
harddrive configuration. Doe'nt seem to recognize my CDROM
drive either trying to boot the Linux 7.2 installation CD.

Thanks
-Rick