Rocks: Recover Partition Table

Two Step Recovery Procedure - Recover the partition tables - Re-install the grub boot loader

Utility to recover the disk partitions: www.cgsecurity.org/wiki/TestDisk 

# Easiest to book off knoppix
testdisk /dev/sda

# proceed through the menus 
# intel/pc partition should be fine unless running a GPT parititon
# apply changes when partitions are discovered]

# then boot off a rocks rescue disk
# at the boot prompt:
build rescue 

chroot /mnt/sysimage
grub-install /dev/sda