fdisk -l

To list the partition details from command prompt

Ex:

[root@localhost grub]# fdisk -l

Disk /dev/hda: 255 heads, 63 sectors, 4864 cylinders
Units = cylinders of 16065 * 512 bytes

Device Boot Start End Blocks Id System
/dev/hda1 * 1 2432 19535008+ 7 HPFS/NTFS
/dev/hda2 2433 4864 19535040 f Win95 Ext'd (LBA)
/dev/hda5 2433 4813 19125351 83 Linux
/dev/hda6 4814 4864 409626 82 Linux swap