I have no idea how the sim was deleted, but GBs of files can be deleted rather quickly because all Windows has to do is mark the sectors used by the files as free to assign to new files, Windows does not actually erase the data in those sectors.
I have no idea how the sim was deleted, but GBs of files can be deleted rather quickly because all Windows has to do is mark the sectors used by the files as free to assign to new files, Windows does not actually erase the data in those sectors.