sudo fdisk -l

Disk /dev/sda: 500.1 GB, 500107862016 bytes
255 heads, 63 sectors/track, 60801 cylinders, total 976773168 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x0001d68e

   Device Boot      Start         End      Blocks   Id  System
/dev/sda1              63     5863724     2931831   fd  Linux raid autodetect
/dev/sda2   *     5863725     6843689      489982+  fd  Linux raid autodetect
/dev/sda3         6843690    61528949    27342630   fd  Linux raid autodetect
/dev/sda4        61528950   976768064   457619557+  fd  Linux raid autodetect

Disk /dev/sdb: 500.1 GB, 500107862016 bytes
255 heads, 63 sectors/track, 60801 cylinders, total 976773168 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x0001d68e

   Device Boot      Start         End      Blocks   Id  System
/dev/sdb1              63     5863724     2931831   fd  Linux raid autodetect
/dev/sdb2   *     5863725     6843689      489982+  fd  Linux raid autodetect
/dev/sdb3         6843690    61528949    27342630   fd  Linux raid autodetect
/dev/sdb4        61528950   976768064   457619557+  fd  Linux raid autodetect