If you are talking about a 6th generation Classic, there is nothing you can do. It is only going to recognize 128 gb no matter what card you use. I don't know about a replacement hard drive. If you are talking about the 7th generation Classic you can update it. When I upgrade (usually due to a drive failure) I always go SSD. Price wise it is the best value. I do the upgrade of $65 (not including parts) You can supply the parts or I can supply them
It is a iPod classic model a1238 160 gb. MC297/LLA. I believe that this is a 7th generation. It is a brand new one I just bought a few months ago as a backup for my existing iPod. I would definitely be interested in having you do the work as well as supplying the parts. How large of an SSD can be upgraded? Please let me know how I can contact you