# fdisk -lu /dev/sda

Disk /dev/sda: 320.0 GB, 320072933376 bytes
255 heads, 63 sectors/track, 38913 cylinders, total 625142448 sectors
Units = sectors of 1 * 512 = 512 bytes

   Device Boot      Start         End      Blocks   Id  System
/dev/sda1              63      530144      265041   82  Linux swap / Solaris
/dev/sda2   *      530145     2634659     1052257+  fd  Linux raid autodetect
/dev/sda3         2634660   625137344   311251342+  fd  Linux raid autodetect