I have USB device, which is actually identified as serial device by Ubuntu 10.04. How can I find its full path?

ls -la /dev/

shows a lot of devices. How to choose correct one?


From a Terminal prompt:

df -h

You should have a screen similiar to the one attached which should give you the mount point of the USB device.

enter image description here

  • 4
    -1 that command will show disk usage when the OP has stated his device is showing up as a serial device. – Nathan Osman Sep 5 '11 at 16:12

Probably the simplest thing to do, but not always simple to interpret, is to run dmesg after inserting the device.

For a flash memory pendrive you can find something like the following

[39653.096626] usb-storage: device scan complete
[39653.097617] scsi 6:0:0:0: Direct-Access     Kingston DataTraveler 2.0 1.00 PQ: 0 ANSI: 2
[39653.099860] sd 6:0:0:0: Attached scsi generic sg2 type 0
[39653.101089] sd 6:0:0:0: [sdb] 1994752 512-byte logical blocks: (1.02 GB/974 MiB)
[39653.101588] sd 6:0:0:0: [sdb] Write Protect is off
[39653.101592] sd 6:0:0:0: [sdb] Mode Sense: 23 00 00 00
[39653.101595] sd 6:0:0:0: [sdb] Assuming drive cache: write through
[39653.110832] sd 6:0:0:0: [sdb] Assuming drive cache: write through
[39653.110839]  sdb: sdb1 sdb2
[39653.197706] sd 6:0:0:0: [sdb] Assuming drive cache: write through
[39653.197712] sd 6:0:0:0: [sdb] Attached SCSI removable disk
[39653.960873] EXT4-fs (sdb2): warning: maximal mount count reached, running e2fsck is recommended
[39653.962127] EXT4-fs (sdb2): mounted filesystem with ordered data mode

where it is simple to see that two partition /dev/sdb1 and /dev/sdb2 are on the drive.

For a serial device you should find something talking about ttyS0 or similar, corresponding to /dev/ttyS0.

  • OK, but what is the path? – Kajsa Apr 5 at 12:08
  • don't you see sdb2? the path is /dev/sdb2 – enzotib Apr 5 at 13:27

For serial devices I tend to look in /dev/serial/by-id. For disks I use /dev/disk/by-label. If you use ls -l on those they'll show you where they're linked to.


You can find all information related to a device from the built-in disk utility available in Ubuntu (called Disks in Ubuntu 13.04 and newer versions.).

  • full path of device. (e.x. /dev/sdb1 or /dev/sdc1)
  • partition type
  • serial number
  • size of device and model name

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