dmesg: 

usb-storage: device found at 2
usb-storage: waiting for device to settle before scanning
  Vendor: ST310014  Model: A                 Rev: 0811
  Type:   Direct-Access                      ANSI SCSI revision: 00
usb-storage: device scan complete
SCSI device sda: 20005650 512-byte hdwr sectors (10243 MB)
sda: test WP failed, assume Write Enabled
sda: assuming drive cache: write through
SCSI device sda: 20005650 512-byte hdwr sectors (10243 MB)
sda: test WP failed, assume Write Enabled
sda: assuming drive cache: write through
 sda:<6>usb 2-1: reset full speed USB device using ohci_hcd and address 2




cat /proc/partitions: cat /proc/partitions 
major minor  #blocks  name

   3     0   78150744 hda
   3     1   30716248 hda1
   3     2      40162 hda2
   3     3     498015 hda3
   3     4          1 hda4
   3     5   19535008 hda5
   3     6   27358663 hda6
   8     0   10002825 sda




 sudo mkfs.vfat -I /dev/sda 
mkfs.vfat 2.11 (12 Mar 2005)
/dev/sda: No such file or directory