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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?

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2 Answers

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.

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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

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-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
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