fdisk

ubuntu@ubuntu:~$ sudo fdisk -l

Disk /dev/sda: 80.0 GB, 80000000000 bytes
255 heads, 63 sectors/track, 9726 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x0001af58

   Device Boot      Start         End      Blocks   Id  System
/dev/sda1   *           1        9325    74895360   83  Linux
/dev/sda2            9325        9726     3226625    5  Extended
/dev/sda5            9325        9726     3226624   82  Linux swap / Solaris
ubuntu@ubuntu:~$