Transcend Information Portable Hard Disk TS40GHDU1 - Manual (Page 12)

is new or has previously been configured with one large partition, you
can select Use Existing Partition Table. If your disk has previously been
configured with multiple small partitions, you should select Re-arrange
Partition Table.
4. (First time drive use) If you chose to re-arrange the partition table, specify
the size and format type for your partition(s).
By default, the size of the first partition will be equal to the full size of
your C drive. You can reduce this number if you are not using the full
disk, but be sure to allow for expansion.
5. (First time drive use) Click Start to begin preparing your disk.
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