If you orphan the object by not having anything point to it, it goes away when "git gc" is run. That happens automatically after about two weeks by default.

Even things like "git add" will create objects stored in the .git folder.

I have had git corruption problems on a raspberry pi sd card, usually I just had to reclone/abandon that folder

It honestly sounds like git is the least of your problems here...

yeah I can delete the .git folder and repull/add the remote origin, I had to do that again the other day. I'm not sure what it is, my SD card is a gold sandisk too not a cheapo.