Xbox hdd upgrade (by 3 users)

Yes, an error code of 05 means your Xbox drive is unlocked. Ask me if you have any more problems.

In this case you might want to try to just clone your old drive using Chimp.
Using Chimp:
Unlock your new HDD.
Fire up your Xbox normally, and start Chimp. Connect the new drive to some kind of power supply, another Xbox works fine, or you can use a PC, or even just a Y-adapter in the Xbox you're working on. If you're using another Xbox, make sure you put a video cable in it, it doesn't have to be in the TV, just in the Xbox. Otherwise it won't boot long enough to power the drive. It's okay if it flashes error messages via the LED lights, just make sure the new drive is being powered.
Now, while Chimp is waiting, unplug the IDE cable from the DVD-drive and put in in your new drive, but leave the DVD drive powered. You don't have to be too quick, so be sure not to bend any pins. Now have Chimp scan for devices. It should show you the HDDs in your Xbox. If it shows your new one, you're ready to clone. Now tell Chimp to clone/copy your drive. When it's done, lock it, and unplug everything and plug your Xbox back together normally with the new drive in it. It should work fine. If you're having trouble getting Chimp to recognize the new drive, it's either locked or the jumper settings need to be checked on the HDDs.

If you have the "eeprom.bin" file backed up, fixing an error 05 should be no problem. The HDD just needs to be "locked". The eeprom.bin files is like a key for this lock.
If you are making a new HDD, and still need to lock the new one but have the old one still, you can use Chimp.
Otherwise, you'll have to use XboxHDM.
If you don't have a copy of your eeprom file, you'll have to build a special chip that lets you read your eeprom.
Find everything you'll ever need here:
http://forums.xbox-scene.com/