Sega Saturn official backup cart issue

I've just recently plonked in my official Saturn backup cart into one of my Saturns and an odd thing has happened - while it appears as normal in the backup manager part of the BIOS, only 38 blocks are showing as free but no individual saves are listed - the only option is to clear the cart. I then tried in another Saturn and had the same issue. Cart slots in both seem nice and clean - 1mb and 4mb carts work perfectly - but others have commented on corrupted carts as something that just happens, even with the official carts.

So.... has anyone come across this before? I'd like to recover those saves but I have a feeling I'm out of luck!!!

 

Probably corrupt. Disassemble the cart and clean first though

 

Thanks for that - I'll pull apart and give it a decent clean and see how I go!