yamt-vita VS IMCUnlockLite

Another possibility: I've been told that some users who formatted their SD2Vita cards on-device using YAMT to format it as TexFAT will sometimes encounter issues, as the TexFAT format isn't always cooperative with Windows... It's not supposed to happen, but apparently it does sometimes.

Do 32K (64 with 256Gb) cluster size and update to YAMT. This also makes it texfat wich improves read / writes.

You might find YAMT useful if you have been using storage manager or other sd2vita application.

Do you have the plugin for sd2vita, set up properly? Are you using YAMT or storagemanager? Has the 64gb micro sd been properly formatted to work with the vita's sd2vita?

Which sd2vita driver (plugin) do you have installed? YAMT or storagemanager? Or did you install using vitaDeploy?

Ever heard of YAMT?

Also I think its time for you to move away from "gamesd" and move to something more modern like yamt or storage mananger.

If its not setup already, yes you just install, run and choose unlock. Its recommended to disable your plugins before you do.

Else, the card is necessary for a 1000 model. My advice is to buy a used 4GB ($10-$15), setup the hack, then install imcunlock lite. This will give you access to a 1GB internal storage, similar to a 2000 model. This partition is available even if the hack is removed, so it completely removes the console's dependence on memory cards. Then sell the 4GB memory card back into the market for what you paid.

If you have an OLED, use imcunlock lite to create a internal 1GB storage (removes dependency on memory card, even when running stock).

Definitely sounds like memory card failure. Only option is to buy another memory card to run homebrew applications. Next time you might want to look into imc unlock lite; this application will create a ~1GB internal storage on your OLED (similar to a Slim). This way, if your memory card ever fails you can revert to imc0 partition as a backup.

If the Vita is a slim, you don't need an official memory card as it has a built it memory. If its a phat oled consider this. IMCUnlockLite / IMCUnlock (if your not sure what your doing stick with the lite version). This is an option, use it as your own risk.

Once you have sd2vita setup, look into IMUnlock Lite to create a small internal partition, similar to the internal partition on a Slim. This will protect you from requiring a memory card once sd2vita is setup. In fact, I know people that have bought a used 4GB from Gamestop, setup sd2vita then IMCUnlock, and returned the memory card to Gamestop.