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-   -   Can't mount cdrom any more. (https://www.linuxquestions.org/questions/linux-hardware-18/cant-mount-cdrom-any-more-304757/)

linmith 03-22-2005 01:08 PM
Can't mount cdrom any more.
 
I've been able to mount CDs fine until recently, and now I can't at all. When I type
Code:
mount /mnt/cdrom
I get an error:
Code:
mount: /dev/hdb is not a valid block device
/dev/hdb is my cdrom drive.

I think it might have something to do with a kernel module, since I've been fidling around with them recently...but I'm not sure what to do. Any suggestions?

Itzac 03-22-2005 01:20 PM
Could you please post the output of 'lsmod', 'uname -r', and 'cat /proc/ide/hdb/model'?

Also, if your harddrive is hda, I would recommend putting your CD-ROM on the other IDE channel on your motherboard. IDE can only go as fast as the slowest device on the chain, and that's usually the CD-ROM. By putting the HDD and CD-ROM on seperate IDE channels, each is able to operate at maximum speed.

linmith 03-22-2005 01:31 PM
lsmod:
Code:
Module                  Size  Used by    Tainted: P
snd-pcm-oss            37736  1
snd-mixer-oss          12504  2 [snd-pcm-oss]
usb-ohci              19240  0 (unused)
ehci-hcd              17580  0 (unused)
forcedeth              9164  1
snd-intel8x0          18924  4
snd-ac97-codec        49500  0 [snd-intel8x0]
gameport                1420  0 [snd-intel8x0]
snd-pcm                56072  0 [snd-pcm-oss snd-intel8x0]
snd-timer              13604  0 [snd-pcm]
snd-page-alloc          6328  0 [snd-intel8x0 snd-pcm]
snd-mpu401-uart        3200  0 [snd-intel8x0]
snd-rawmidi            12740  0 [snd-mpu401-uart]
snd-seq-device          3888  0 [snd-rawmidi]
snd                    30852  1 [snd-pcm-oss snd-mixer-oss snd-intel8x0 snd-ac97-codec snd-pcm snd-timer snd-mpu401-uart snd-rawmidi snd-seq-device]
soundcore              3396  4 [snd]
nvidia              3642236  6
joydev                  5888  0 (unused)
keybdev                2052  0 (unused)
mousedev                4212  0 (unused)
hid                    21220  0 (unused)
input                  3200  0 [joydev keybdev mousedev hid]
usbcore                59308  1 [usb-ohci ehci-hcd hid]
agpgart                43940  3
apm                    9580  2
uname -r:
Code:
2.4.26
cat /proc/ide/hdb/model:
Code:
LITE-ON COMBO SOHC-5232K

linmith 03-24-2005 02:26 PM
*bump* Can you still help me?

Itzac 03-24-2005 06:07 PM
Take a look at /boot/config and look at the values of CONFIG_BLK_DEV_IDESCSI and CONFIG_BLK_DEV_IDECD. If they're both equal to 'y', then I have no idea how to help you. If either of them is set to 'm' then you need to load the respective module, ide-scsi or ide-cd respectively. If this solves the problem you need to make sure the module gets loaded at boot-up.

The other possible problem is one with the node in /dev. To check this do 'ls -l /dev/hdb'.

It should return something like 'brw-rw---- 1 root disk 3, 64 2005-03-24 09:46 /dev/hdb'. If it starts with anything other than b, then you need to replace the node.

Also, just for kicks, why don't you post your fstab.

skaven 03-24-2005 06:29 PM
Well if your fstab is mounting "/dev/hdb", then you're not using ide-scsi, at least not to do normal read operations (I recommend using ide-scsi if you're going to be doing any cd burning, however).

Thus don't worry about the ide-scsi stuff just yet.

Since the output of cat /proc/ide/hdb/model is showing a model number, then that means that the kernel "knows" your drive is there. It actually was able to access it on the IDE bus and read the model number. This is good.

This means one of two things:

1. the actual device node could be corrupt, as noted by Iztac.

2. your CD-ROM is being flaky and has decided to quit reading CDs.

I'd bet on the second one before the first, unless you've been doing something as root recently in /dev...


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