Hi,

I can't read CDROM.
What's wrong now while I could read it before many times.

I re-installed redhat9 that means CD worked well.
Also it recogizes CD when I put CD on boot time.
But after system is booted up, I can never read CDROM again.

fstab says:
/dev/cdrom /mnt/cdrom udf,iso9660 noauto,owner,kudzu,ro 0 0

mount /dev/cdrom /mnt/cdrom says:
not a dierctory or i/o error happens.
(I put a redhat9 disc1 that is really readable at boot)

Please give me a hint.

Thanks,
Shigeru

Hi, did you tried mounting the cdrom with root account?
I would edit the fstab file, changing noauto to auto so linux will make the work for me mounting the device when a media is inserted.

Try this first

Excuse for my not so fine english

Hi,

the problem is not auto mount but never be mounted in any way.
I did it as root but not mounted.

Probably the link who refers /dev/cdrom is changed.
Did you enabled scsi emulation? If so your cdrom is not more seen as /dev/hdx but as /dev/scd0 with a symbolic link to /dev/cdrom.

Type ls -l /dev/cdrom as root and check the symbolic link to wich device refer then at console prompt type "dmesg" and check under wich device is recognised the cdrom.

Hi,

Thanks and I guess you're right.

ls /dev/cdrom* says:
/dev/cdron -> /dev/hdc
/dev/cdrom1 -> /dev/scd0

dmesg says repeatedly:
UDF-fs DEBUG super.c:1157:udf_check_valid: Failed to read byte 32768. Assuming open disc. Skipping validity check
hdc: command error: status=0x51 { DriveReady SeekComplete Error }
hdc: command error: error=0x50
end_request: I/O error, dev 16:00 (hdc), sector 1306628

I didn't know and didn't intend to enable scsi emulation.
How can I turn off this emulation?

Thanks and regards
Shigeru Serizawa

Is /dev/cdrom your dvd and /dev/cdrom1 your burning device?

Make this test initially, edit fstab file giving to cdrom only iso9660 file system without UDF. Maybe this option may resolve quickly the problem.

To tunr off ide-scsi emulation you have to check if this is activated as a kernel module. So in a root's shell type "lsmod" to see which kernel modules are activated. Then if you see in that list ide-scsi type "modconf" and select the module under the scsi section and remove it from kernel.


I hope this help

Hi, thanks for your reply,
I guess I'm close to fix this, but still in trouble...

First I edited fstab to delete udf and booted the system, but it still in same trouble.
CDROM and CDROM1 are IDE ATAPI devices for CDROM and CDRW and they looks as below in dmesg:
-----------------------------------
hdc: SAMSUNG CD-ROM SCR-2432, ATAPI CD/DVD-ROM drive
hdd: LG CD-RW CED-8080B, ATAPI CD/DVD-ROM drive
...
hdc: attached ide-cdrom driver.
hdc: ATAPI 32X CD-ROM drive, 512kB Cache, DMA
Uniform CD-ROM driver Revision: 3.12
SCSI subsystem driver Revision: 1.00
hdd: attached ide-scsi driver.
scsi0 : SCSI host adapter emulation for IDE ATAPI devices
Vendor: LG Model: CD-RW CED-8080B Rev: 1.00
Type: CD-ROM ANSI SCSI
Attached scsi CD-ROM sr0 at scsi0, channel 0, id 0, lun 0
sr0: scsi3-mmc drive: 32x/32x writer cd/rw xa/form2 cdda tray
------------------------------------
Linux seems automatically attach scsi driver for CDROM1.
lsmod says below:
ide-scsi 12208 0
scsi_mod 107544 3 [sg sr_mod ide-scsi]
ide-cd 35712 0
cdrom 33728 0 [sr_mod ide-cd]

I didn't find modconf command in my system.

I'm sorry to attach a lot of raw messages, but please give me another help.

Thanks a lot,
Shigeru Serizawa

Ok, try this:

as root edit file /etc/modules , here is a list of all modules loaded at boot-time. Try to comment with "#" ide-scsi. Then reboot, this time the scsi emulation should be not activated and your devices listed only as hdc and hdd.

When I was using Redhat8.0 last year I had a lot of problems concerning the scsi emulation (at each boot I had to rebuild the symlink /dev/cdrom-->/dev/scda-->/dev/hdc) The problem is that the emulation is necessary to use mastering program such as k3b,cdroast...

In other chance you could rebuild your kernel WITHOUT ide-scsi support or pass to Debian

Excuse me for poor english.