Hi
Sorry to tell you but some flash adapters are just like that
There is this guy on YouTube called dankpods who does this sort of things and he will tell you the same thing
There is a company called iflash that makes the adapters and the are really good when it comes to restores and things like that
But one more thing before you buy anything what I would try is download the software called superduper
Put take all data from the old iPods hdd and copy it straight to the compact flash adapter
And cross you fingers and hope that it works
If you have any more questions please ask
Thanks:)