The system is clearly dead now and it is likely that this memory card format sent it to its grave far earlier than it should have.

Also, 64gb sounds like a lot, but Sony uses a weird file system where games take up way more space that they should and game update files(for whatever reason) are a redownload of the full game

This is one of the greatest issues if not he single biggest downfall of the vita as a system

Thank you AkihabaraGames!The card of course is the largest capacity available for a proprietary storage system