I have a hard drive which is removable (hot-swappable in a laptop's bay). The drive has unallocated free space at the beginning, probably because it was previously a primary drive and I don't think it has been formatted since. It was successfully partitioned once with version 10, latest build, but the unallocated space remains. I would like one more partition (so as to have three). There is no data of consequence on the drive, and I can copy it to the primary drive in any case. The unallocated space seems a waste. Would it be advisable to reformat the drive, and if so what procedure should I follow?