mount: special device /dev/sdb1 does not exist

sysbox · 10-07-2009, 04:08 PM

I'm trying to mount an external usb drive. The dmesg output is as follows

Code:

usb 1-5: new high speed USB device using ehci_hcd and address 25
usb 1-5: configuration #1 chosen from 1 choice
scsi28 : SCSI emulation for USB Mass Storage devices
usb-storage: device found at 25
usb-storage: waiting for device to settle before scanning
  Vendor: Seagate   Model: FreeAgent         Rev: 0132
  Type:   Direct-Access                      ANSI SCSI revision: 04
SCSI device sdb: 2930277168 512-byte hdwr sectors (1500302 MB)
sdb: Write Protect is off
sdb: Mode Sense: 2d 08 00 00
sdb: assuming drive cache: write through
SCSI device sdb: 2930277168 512-byte hdwr sectors (1500302 MB)
sdb: Write Protect is off
sdb: Mode Sense: 2d 08 00 00
sdb: assuming drive cache: write through
 sdb: sdb1
sd 28:0:0:0: Attached scsi disk sdb
sd 28:0:0:0: Attached scsi generic sg2 type 0
usb-storage: device scan complete

However, I can't mount it:

Code:

# mount /dev/sdb1 /mnt/usb
mount: special device /dev/sdb1 does not exist

Nor can I run fdisk:

Code:

# fdisk /dev/sdb

Unable to open /dev/sdb

There is no /dev/sdb or /dev/sdb1. This occurs for any USB drive I try, and they all mount fine on other Linux machines. What should I do?

sycamorex · 10-07-2009, 04:12 PM

If it's the case with any usb drive you've tried, I would assume your usb port might be faulty. Have you tried connecting a usb mouse/keyboard via this port?
edit: what's the output of: fdisk -l ?

repo · 10-07-2009, 04:13 PM

Try

Code:

cd /dev/
./MAKEDEV sdb

sysbox · 10-07-2009, 04:22 PM

Thanks to repo. 'MAKEDEV sdb'. I'm not sure why they weren't there by default, but now I know how to make them. Thanks again.

girish19 · 11-11-2013, 01:51 AM

hi repo

my error is special device /dev/sdc1 does not exist

i have mistekaly type

cd /dev/
./MAKEDEV sdb

now i am facing issue. Grub is not loading. what should i do?