On your new work machine, which I suspect is Windows 8, part of the 1 TB is allocated to the hidden UEFI partition. There is also probably a hidden system recovery partition. In addition to the overhead of formating, slack bytes, cylinder head alignment, partition table, etc…
Flash drives are made as super floppies; no MBR, no partition table, no cylinder alignments, etc., all of which get destroyed when a user formats them, thus their numbers are closer together.
