so luckless!! you might lose you partition table on hda.
I got a powerful harddisk kit at yesterday
If you had not written any data to /dev/hda since system crashed, I believe the kit can rescue your data.
testdisk-5.3.tar.gz ( http://www.cgsecurity.org/testdisk-5.3.tar.gz
compile and install it , then cp /usr/local/sbin/testdisk to a floppy, bootup system with RH CD1, mount /dev/fd0 with testdisk kit,
testdisk can analyse your hda structure and print to screen
press 'ALT + F2' switch console and use fdisk /dev/hda,
repartition hda as same as testdisk export .
when repartition completed, reboot system and into rescue mode
note: don't format new partitions
use fdisk -l you can find partitions back.