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Having trouble installing a piece of hardware? Want to know if that peripheral is compatible with Linux?

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Old 07-05-2004, 07:30 PM   #1
talkinggoat
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cdrom issues


i have a plextor 40-12-10a that has been working fine since i installed rh. now, all of a suden, the cdrom will not work. it is setting up as a hard drive. does anyone have a starting point where i can begin to troubleshoot this problem?
 
Old 07-05-2004, 07:38 PM   #2
penguin4
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talkinggoat; assume u refer to cd working in W. but now not with rh? any probability u can check if that cdrom is proprietary with windows. also check
favorite http://tldp.org/HOWTO/HARDWARE-HOWTO/index cdrom for compatiblity/support/nonsupport. those will indicate if usable with linux.
 
Old 07-05-2004, 09:03 PM   #3
talkinggoat
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penguin4; the cdrom was working fine since the original install six months ago. it isn't a proprietary issue. it is seeing it in the bios and in the bootup of linux, however, it thinks that it is a hard drive, all of a suden. it has JUST started doing this, but i don't yet know enough to have a starting point.
 
Old 07-06-2004, 11:38 AM   #4
penguin4
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talkinggoat; may not think its not proprietary but when it requires W or better it may be. never the less ur config of hd primary & secondary may be
where it is,check that out & reconfig .
 
Old 07-07-2004, 10:54 PM   #5
talkinggoat
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that's my signature, bud. sorry. try again.

if i remove or reconfigure the hard drive in any physical way, it causes the os to look for it during boot. in short, it causes problems. there is some type of of software issue at work here. as i am a noob to linux, but a guru to windows, i don't know where to start searching for a problem. if anyone has a real starting point, please feel free to voice it here.

Last edited by talkinggoat; 07-07-2004 at 10:55 PM.
 
Old 07-08-2004, 02:17 AM   #6
J.W.
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talkinggoat - the very first question would be: did you make any system changes, after which the CD started to misbehave? If so, what were they? Additionally, when you say the CD is being recognized as a hard drive, what exactly do you mean? What kinds of error messages are you getting, or what kinds of tasks are you attempting to perform when you encounter this obstacle? Additionally, could you post the results of running the "fdisk -l" command (that's a lower case L) as well as the contents of the fstab file (which is in the /etc directory) I'll admit at first glance, I thought your question may be about the boot sequence in your BIOS, but if you've got deep experience in Windows I'll assume that's not what you're talking about. -- J.W.
 
Old 07-08-2004, 04:42 AM   #7
hasnain
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CDROM Problem

hello


if ur CDrom is not mounting then the solution is ssimple u can make it accessable by using terminal

[root @ localhost root] mount /dev/cdrom

or

[root @localhost root] mount /mnt/cdrom


try both 1

regards
 
Old 07-08-2004, 01:51 PM   #8
penguin4
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J.W.,hasnain, & talkinggoat; thanks J.W. & hasnian, that is what was refering to. the reference added to original post was cd dr labeled as for
W or better. which maybe interpreted as only W, ME, XP. maybe wrong and
will stand corrected thank you.
 
Old 07-11-2004, 10:46 PM   #9
talkinggoat
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j.w. i looked at my other linux box, and it should be picked up as a hard drive ex: hdc from dmesg. i get this, as well...

hdc: PLEXTOR CD-R PX-W4012A, ATAPI CD/DVD-ROM drive ...

hdc: attached ide-cdrom driver.
hdc: ATAPI 40X CD-ROM CD-R/RW drive, 4096kB Cache, UDMA(33)

if i try to mount it, i get :
mount: block device /dev/cdrom is write-protected, mounting read-only

when i try to access it. i goes haywire and crashes the system.

if i try to remove it, it complains and complains during bootup. kudzu doesn't ask to reconfigure, though.

[root@beta log]# /sbin/fdisk -l

Disk /dev/hda: 61.4 GB, 61492838400 bytes
255 heads, 63 sectors/track, 7476 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

Device Boot Start End Blocks Id System
/dev/hda1 * 1 13 104391 83 Linux
/dev/hda2 14 7346 58902322+ 83 Linux
/dev/hda3 7347 7476 1044225 82 Linux swap
[root@beta log]# /sbin/fdisk -l /dev/hdc

Disk /dev/hdc: 734 MB, 734334976 bytes
255 heads, 63 sectors/track, 89 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

Disk /dev/hdc doesn't contain a valid partition table

[root@beta log]# cat /etc/fstab
LABEL=/1 / ext3 defaults 1 1
LABEL=/boot1 /boot ext3 defaults 1 2
none /dev/pts devpts gid=5,mode=620 0 0
none /proc proc defaults 0 0
none /dev/shm tmpfs defaults 0 0
#/dev/hde3 swap swap defaults 0 0
#/dev/hdc3 swap swap defaults 0 0
/dev/hda3 swap swap defaults 0 0
/dev/fd0 /mnt/floppy auto noauto,owner,kudzu 0 0
/dev/cdrom /mnt/cdrom udf,iso9660 noauto,owner,kudzu,ro 0 0
 
Old 07-12-2004, 01:27 PM   #10
J.W.
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I'm still a little confused. If you can mount the CD successfully, then you can safely ignore any "readonly" messages, because by definition a CD-ROM is read only. Additionally, if you were to remove the CD drive itself, then of course the system would complain during bootup, because you are referencing a device in fstab that is not physically connected to the machine.

Let's return to the beginning: you indicated that your CD was working fine for several weeks, then suddenly started to misbehave. What system changes/modifications did you make immediately prior to that? I would expect that's the likely cause in this sudden change in operation.

In any event, the process for mounting a data CD (not an audio CD, which doesn't need to be mounted) is to place the CD into the drive, then mount it. Example
Code:
mount /dev/cdrom /mnt/cdrom
Please see the man pages for mount for more detail as well as for optional parameters you can set. Once the CD has been mounted, you should be able to go to the /mnt/cdrom directory and access the data. Note: depending on how the CD was burned, it's possible that a regular user account may not have Read permissions on those files. If so, you could temporarily switch to being root, copy the data from the CD into a directory in the regular user's /home directory, and then access it from there.

Hopefully this will be helpful. If not, then perhaps you could describe what data files you've got on that CD-ROM, and also exactly what kind of error messages are generated when the system "goes haywire" and crashes. From the sound of it most of what you describe seems generally OK, but obviously having the system crash when accessing the CD isn't normal. -- J.W.
 
  


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