What the fuck is happening with Windows 10 after April 2018 update?

1. Opened my local github repo in external drive
2. Made changes
3. Try to stage, get this weird "error: unable to open object pack directory: .git/objects/pack: Function not implemented" error.
4. Googled it, says check drive for errors.
5. Scanned drive, fixed error, drive has no errors.
6. Opened my repo, all file sizes are "ZERO", including my changed work, gone, poof.