External firewire CDRW/DVD gone, and I can't get it back.

speedbump · 10-26-2003, 01:23 AM

Spent the past couple of hours searching the archives here, but not seen anything that might solve this problem.

machine:
SONY Picturebook C1MW, 256MB, 30GB, Crusoe 867Mhz, external firewire CDRW/DVD drive.

problem:
Call this an I/O error, folks

I was messing around in fstab trying to get the memory stick slot to work, and was having difficulty, so I deleted the entry for it. I also accidentally deleted the line above, which contained info for the cdrw/dvd drive.

I then deleted the /mnt/cdrom directory, thinking that I could just restart and kudzu would pick it back up again. Wrong.

There are no entries for this drive in dmesg, however it shows up as a scsi device using the sbp2 driver in red hat's "hardware browser", but no cd-rom drives are listed.

"kudzu -p" shows:
class: SCSI
bus: FIREWIRE
detached: 0
driver: sbp2
desc: "Sony [080046] / i.LINK CD-RW DVD-ROM Drive [19000d]"

"cat /proc/scsi/scsi" shows: (this is the memory-stick slot, not the cd drive)
Attached devices:
Host: scsi1 Channel: 00 Id: 00 Lun: 00
Vendor: Sony Model: MSC-U03 Rev: 1.00
Type: Direct-Access ANSI SCSI revision: 02

So, I guess what I need to do is:
1. Determine which device of the 7500 or so in /dev will work with this drive.
2. Get the machine to load the device
3. establish a link to /dev/cdrom and then again to /mnt/cdrom
4. create a new entry in fstab for the drive.

I can deal with items 3 & 4, but will need some help with 1 & 2

Since the machine does detect the drive in H/W browser & kudzu, is there some additional hardware probing tool out there to determine what it's true device name is? (Kudzu & h/W browser just don't have the detail I'm looking for...)

Many, many thanks in advance for any assistance.

finegan · 10-27-2003, 10:30 PM

dmesg

That's the kernel's log of bloody near everything. You're looking for a scsi device scan, like:

Code:

scsi singledevice 0 0 7 0
scsi singledevice 1 0 0 0
  Vendor: Apple     Model: iPod              Rev: 1.50
  Type:   Direct-Access                      ANSI SCSI revision: 02
Attached scsi removable disk sda at scsi1, channel 0, id 0, lun 0
SCSI device sda: 39063024 512-byte hdwr sectors (20000 MB)
sda: test WP failed, assume Write Enabled
 sda: sda1 sda2

The bottom line is the important part that's the device it showed up as and its partition information, so in the above case there are mountable partitions at /dev/sda1 and /dev/sda2 and the fstab entry for the thing looks like:

/dev/sda2 /mnt/ipod vfat defaults,uid=12352,gid=100,user,noauto 0 0

Except edit it for your user id and your group ID, Redhat UID and GID for the first user created on the system will make you 500 and 500.

Cheers,

Finegan

speedbump · 10-27-2003, 11:54 PM

Despite being seen by kudzu and RH's hardware browser, there is*no*entry for this drive in dmesg for kernel 2.4.22. The only scsi device is SDA, and that's the memory stick. The only other drive is the main ide, HDA.

When upgrading, i did a make oldconfig, changing only the processor type. No other changes.

Drive appears and works fine under kernel 2.4.20-20.9

anyway, I've solved the problem (after a fashion) and dumped 2.4.22. I'll try that kernel another day.

Finegan, thanks for your reply. Sorry if my frustration showed through.