Note: Some of the instructions are very similar (if not the same) as the other iPods so don't be surprised if I repeat myself...
We all have or know of someone who has an iPod with a dead hard drive. Of course you can simply buy another drive but you're back to the same power-hungry, failure-prone, fragile rotating media. Instead, upgrade your iPod to use Flash Memory. Sure a hard drive can hold all 30,000 of your songs, but even a 4GB card can hold over 24 hours of music - I usually change out songs often enough that I don't need to carry 20+ Gig of songs at all times.
You can also check out my new Bluetooth 5G iPod Video at iPodHackers.net
Step 1: What You Need
Although you can get adapters for the 4G iPod cheap on eBay, Tarkan Akdam is in my opinion the only person in the world selling a reliable adapter for the 5th Gen iPod Video. Get yours HERE. Don't come crying to me if you use some cheap Taiwanese adapter and burn up your iPod!
2) iPod-Opening tools (non-marking plastic tools and/or flathead screwdriver). Tarkan will ship you a set of these with your purchase.
3) You will also need some hot melt glue or double sided foam tape.
4) Of course, you will need a fully ATA-Compliant Compact Flash card. Any size will work, but you can now get 8GB cards for under $60 as of this writing. I've had good luck with Transcend and Sandisk. Check the specs, not all cards will work.
5) Oh yeah, make sure you start off with a fully functioning iPod! Don't assume that the broken unit you bought from eBay simply has a bad drive.