My 20gb 4th Gen iDie Hard Color, model A1099, lost his mind after I dropped it from 2+mtr high on a concrete floor. I ordered a:
64GB KingSpec 1.8-inch IDE CF 50-pin SSD Solid State Disk (MLC)
to replace the original KIA 20gb HDD. Within 24hrs I received the 64gb KingSpec SSD.
I used iFixit's "iPod 4th Generation or Photo Hard Drive Replacement" as my DIY guide.
A good thing to know is that the 64gb KingSpec SSD has the same size as the original 20gb HDD so you don't have to buy a 40/60gb thick rear panel, 40/60gb headphone jack or bracket. Connecting the KingSpec SSD is exactly the same as connecting a HDD
When I was done I attached the iMod to my Laptop. Right after that I got a "iPod Firewire AC Charger" logo on my iMod screen. When I attached it to the AC Charger the "iPod Firewire AC Charger" logo disappeared and the "battery is fully charged" logo appeared. Right after that I connected my iMod again to my laptop. Because iTunes recognized the iMod it started itself up. After I choose "Restore iPod" in iTunes my iMod was within one minute fully functional again. Time will tell if it became a "iDie Harder" ;-)