I encrypted my regular disks with BitLocker, but I am unable to do so with any USB drive I have. When I select the disk in Windows Explorer, I don't have the right-click menu "Manage BitLocker" on those drives and in the status bar underneath it is stated: "BitLocker status: Not Encryptable" (see screenshot).
I already tried reformatting the drives, deleting and recreating the volumes but nothing helps.