fdisk -l /dev/sda

Disk /dev/sda: 50.0 GB, 50019202560 bytes
64 heads, 32 sectors/track, 47702 cylinders
Units = cylinders of 2048 * 512 = 1048576 bytes

   Device Boot      Start         End      Blocks   Id  System
/dev/sda1               1       47702    48846832   86  NTFS volume set