you can use this command to display all recognized drives and all existing partitions in your linux server

# fdisk -l

output might look like this:
Disk /dev/cciss/c0d0: 146.8 GB, 146807930880 bytes
255 heads, 63 sectors/track, 17848 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

           Device Boot      Start         End      Blocks   Id  System
/dev/cciss/c0d0p1   *           1          13      104391   83  Linux
/dev/cciss/c0d0p2              14       17848   143259637+  8e  Linux LVM


NOTE: fdisk is used to delte, display and create new partitions. to show all the current partitions in your server use fdisk -l command. also for virtual filesystem /proc/partitions contains the information of partitions