
Not *Exactly* Gonna Happen
You can't use LTFS to show up like a USB drive. While LTFS enables a user to use the tape "like a disk drive", it must be understood that you will not be able to use the tape drive "just like" a disk. You're talking about Apples and Oranges here.
Yes, they are both storage mediums, but that's where the similarities stop. A HDD (as well as Flash memory) is a random access device that multiple process can read/write data from simultaneously. However, a tape drive is a sequential access device and only one process can read/write data to/from the tape at a time. Once a read or write process is performed on the device, subsequent requests are queued behind the prior command until it is done.
Furthermore, you must use the LTFS tools to mount/unmount an LTFS volume on a Linux, Mac or Windows system to allow the drive to show up as a HDD. For assistance on this part, you need to refer to the LTFS documentation. It requires command line use on Mac and Linux. The commands can be quite long to perform a simple operation.
You must use the 'mkltfs' command to first convert a standard LTO-5 tape to the LTFS format. Becareful that you don't get 'mkltfs' happy with this process as you cannot currently revert a tape back to normal data status in the 1.2.0 LTFS tools.
Once you've formatted the tape for LTFS, you must mount the tape using the 'ltfs' command. You should take a look at
IBM's documents on their LTFS utilities.