nonono...
the h320 original firmware sits in a flash chip (reprogrammable), not on the hdd. Rockbox installation writes a modified firmware to that flash chip so you have both original firmware and rockbox. Rockbox itself is run from the hdd.
now to your problem: to write the rockbox bootloader to the flash chip, we use the original firmware. And that doesn't start with a CF, only with a hdd. So if the disk crashed, it will be hard to get the mod done, unless you have access to a spare hdd to do the installation.
FYI, I'm located in the EU but I'm not a shop and cannot give any warranty....