Further info:

# fdisk -l /dev/sdb

Disk /dev/sdb: 8086 MB, 8086618112 bytes
249 heads, 62 sectors/track, 1023 cylinders
Units = cylinders of 15438 * 512 = 7904256 bytes
Disk identifier: 0x0009e1e0

   Device Boot      Start         End      Blocks   Id  System
/dev/sdb1               1         506     3905783    6  FAT16
/dev/sdb2   *         507         784     2145882   83  Linux
/dev/sdb3             785        1023     1844841    5  Extended
/dev/sdb5             785         809      192944   83  Linux
/dev/sdb6             810         872      486266   83  Linux
/dev/sdb7             873         897      192944   83  Linux
/dev/sdb8             898        1023      972563   83  Linux

# for i in {1,2,5,6,7,8} ; printf "/dev/sdb$i = $(vol_id -l /dev/sdb$i)\n"
/dev/sdb1 = datastore
/dev/sdb2 = grml
/dev/sdb5 = home-rw
/dev/sdb6 = live-rw
/dev/sdb7 = GRMLCFG
/dev/sdb8 = TESTSTUFF

# fdisk -l /dev/sdc

Disk /dev/sdc: 320.1 GB, 320072933376 bytes
255 heads, 63 sectors/track, 38913 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Disk identifier: 0xd6adc55d

   Device Boot      Start         End      Blocks   Id  System
/dev/sdc1               1       38175   306640656    b  W95 FAT32
/dev/sdc2           38176       38783     4883760   83  Linux
/dev/sdc3           38784       38913     1044225   83  Linux

# for i in {1..3} ; printf "/dev/sdc$i = $(vol_id -l /dev/sdc$i)\n"
/dev/sdc1 = MIKAUSB
/dev/sdc2 = USBROOT
/dev/sdc3 = GRMLCFG