Folders and files found on external G-drive

I am running a G-Drive Thunderbolt 3 with an iMac. The drive is running ok, but I found some strange folders with names like, 0a, ob, 1a, 1b, CURRENT, and so on. More than 200 of them mostly with no data in them. Are these the folders used by the drive ? I tried to delete them, but they reappear. Is it possible to permanently delete these or collect them into a single folder ?