USB drive detected (dmesg) but no entry in /dev ?!

demoman · 04-04-2006, 02:19 AM

I cannot mount my USB drive any longer (it did work at some point, after the Ubuntu install) and cannot figure out the issue.
(Incidentally my USB printer also doesn't work but one thing at a time...).

Basically:

the drive is detected when I turn it on (see dmesg below)
weird "type does not exist" in dmesg
it's also in /proc/scsi/scsi (see below)
no corresponding entry can be found in /dev/
fdisk doesn't see it neither
all this was working fine on SuSE and *did* work right after Ubuntu install

All detail below...

Any idea?

Thanks in advance!

Breezy Badger Ubuntu Server 5.1.0

Code:

# uname -a
Linux oooo 2.6.12-9-k7 #1 Mon Oct 10 13:47:52 BST 2005 i686 GNU/Linux

/var/log/messages when I turn on the drive:

Code:

Mar 31 23:18:16 localhost kernel: [4295656.599000] usb 5-2: USB disconnect, address 6
Mar 31 23:18:21 localhost kernel: [4295661.765000] usb 5-2: new high speed USB device using ehci_hcd and address 7
Mar 31 23:18:22 localhost kernel: [4295661.978000] scsi6 : SCSI emulation for USB Mass Storage devices
Mar 31 23:18:22 localhost usb.agent[6438]:      usb-storage: already loaded
Mar 31 23:18:31 localhost kernel: [4295670.945000]   Vendor: USB-HS    Model: WDC WD2500BB-14G  Rev: 0.01
Mar 31 23:18:31 localhost kernel: [4295670.945000]   Type:   Direct-Access                      ANSI SCSI revision: 00
Mar 31 23:18:31 localhost kernel: [4295670.978000] SCSI device sdc: 488397168 512-byte hdwr sectors (250059 MB)
Mar 31 23:18:31 localhost kernel: [4295670.998000] SCSI device sdc: 488397168 512-byte hdwr sectors (250059 MB)
Mar 31 23:18:31 localhost kernel: [4295670.999000]  /dev/scsi/host6/bus0/target0/lun0: p1 p2
Mar 31 23:18:31 localhost kernel: [4295671.045000] Attached scsi disk sdc at scsi6, channel 0, id 0, lun 0
Mar 31 23:18:41 localhost scsi.agent[6475]: Attribute /sys/devices/pci0000:00/0000:00:10.4/usb5/5-2/5-2:1.0/host6/target6:0:0/6:0:0:0/type does not exist

Result of mount:

Code:

#mount -t ext3 /dev/sdc2 /mnt/usblin/
mount: special device /dev/sdc2 does not exist

The USB (WDC) drive is listed in /proc/scsi:

Code:

# more /proc/scsi/scsi
Attached devices:
Host: scsi0 Channel: 00 Id: 00 Lun: 00
  Vendor: ATA      Model: Maxtor 7Y250M0   Rev: YAR5
  Type:   Direct-Access                    ANSI SCSI revision: 05
Host: scsi6 Channel: 00 Id: 00 Lun: 00
  Vendor: USB-HS   Model: WDC WD2500BB-14G Rev: 0.01
  Type:   Direct-Access                    ANSI SCSI revision: 02

Code:

# more /proc/scsi/usb-storage/6
   Host scsi6: usb-storage
       Vendor: BUFFALO INC.
      Product: USB2-IDE Bridge
Serial Number: 00000701080B
     Protocol: Transparent SCSI
    Transport: Bulk
       Quirks:

Nowhere to be found in /dev...

Code:

# ls /dev/s*
/dev/sda  /dev/sda1

And fdisk doesn't seem to see it neither:

Code:

# fdisk -l

Disk /dev/hdb: 40.0 GB, 40020664320 bytes
255 heads, 63 sectors/track, 4865 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

   Device Boot      Start         End      Blocks   Id  System
/dev/hdb1   *           1        4678    37576003+  83  Linux
/dev/hdb2            4679        4865     1502077+   5  Extended
/dev/hdb5            4679        4865     1502046   82  Linux swap / Solaris

Disk /dev/hdc: 250.0 GB, 250059350016 bytes
255 heads, 63 sectors/track, 30401 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

   Device Boot      Start         End      Blocks   Id  System
/dev/hdc1               1        1246    10008463+  83  Linux
/dev/hdc2            1247        1371     1004062+  82  Linux swap / Solaris
/dev/hdc3            1372        3239    15004710   83  Linux
/dev/hdc4            3240       30401   218178765    5  Extended
/dev/hdc5            3240       30401   218178733+  83  Linux

Disk /dev/sda: 251.0 GB, 251000193024 bytes
255 heads, 63 sectors/track, 30515 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

   Device Boot      Start         End      Blocks   Id  System
/dev/sda1               1       30514   245103673+  83  Linux

Just in case, I did a:

Code:

update-usbids

No change.

Interestingly, lsusb doesn't seem too happy:

Code:

# lsusb
Unknown line at line 5924
Unknown line at line 5925
Unknown line at line 5926
Unknown line at line 5927
Unknown line at line 5928
Unknown line at line 5929
Unknown line at line 5930
Unknown line at line 5931
Unknown line at line 5932
Unknown line at line 5933
Unknown line at line 5934
Unknown line at line 5935
Bus 005 Device 007: ID 0411:002a MelCo., Inc.
Bus 005 Device 001: ID 0000:0000
Bus 004 Device 001: ID 0000:0000
Bus 003 Device 002: ID 04e8:324c Samsung Electronics Co., Ltd ML-1740 Printer
Bus 003 Device 001: ID 0000:0000
Bus 002 Device 001: ID 0000:0000
Bus 001 Device 001: ID 0000:0000

tomolesonjr · 04-04-2006, 08:55 AM

I have suse 10.0. my 80 gb usb hd shows up as sda. but you access it through /media? where as my usb flash shows up as /media/usbdisk_1

Tom

adssse · 04-04-2006, 02:34 PM

Can you mount it manually? Have you tried creating a directory such as /mnt/sda1, and then trying 'sudo mount /dev/sda1 /mnt/sda1'?

demoman · 04-04-2006, 03:37 PM

Quote:

Originally Posted by adssse

Can you mount it manually? Have you tried creating a directory such as /mnt/sda1, and then trying 'sudo mount /dev/sda1 /mnt/sda1'?

Yes, I did that:
mount -t ext3 /dev/sdc2 /mnt/usblin/

sda1 is another drive - SATA. The USB drive (sdc according to dmesg) does *NOT* show up in /dev.

Thanks.

tomolesonjr · 04-05-2006, 03:46 AM

Have you tried the modprobe? I have to use it with my zip to get suse to recognize sda in dev.

try modprobe imm. works for my zip to get it to show up. perhaps something like that.
rmmod imm, removes it. that's suse. perhaps there is something similar for you.

good luck!

tomolesonjr · 04-05-2006, 04:03 AM

try lsmod. see if usb_storage appears as a module.

tomolesonjr · 04-05-2006, 04:18 AM

Hi again, I just tried something. do an lsmod. sd_mod, usb_storage, and usbcore.
if they aren't there, do a modprobe sd_mod. that by itself will cause the sda or whatever sd to not show up.

again, good luck.

Tom

demoman · 04-07-2006, 11:28 PM

Quote:

Originally Posted by tomolesonjr

Hi again, I just tried something. do an lsmod. sd_mod, usb_storage, and usbcore.
if they aren't there, do a modprobe sd_mod. that by itself will cause the sda or whatever sd to not show up.

again, good luck.

Tom

Thanks Tom.

Yes, all these modules are there:

Code:

# lsmod | grep -i usb
usblp                  12736  0
usb_storage            74560  2
usbcore               118204  4 usblp,usb_storage,uhci_hcd
scsi_mod              135944  5 sr_mod,sbp2,sd_mod,usb_storage,libata
ide_core              139028  5 usb_storage,ide_disk,ide_cd,ide_generic,via82cxxx
# modprobe sd_mod
#
# ls /dev/s*
/dev/sda  /dev/sda1
# dmesg
{...}
[4890183.677000] Attached scsi disk sdc at scsi8, channel 0, id 0, lun 0
[4890183.697000] usb-storage: device scan complete
# mount -t ext3 /dev/sdc1 /mnt/usblin/
mount: special device /dev/sdc1 does not exist

Thanks anyway!

Bruce Hill · 05-11-2006, 07:51 AM

Did you determine the problem? I'm having a similar issue with 2.6.16.14 and found this thread...