The second USB plug is to help with the power supply to the drive. Some systems supply enough juice using one port, many need both.
I have some that it will run just fine with one USB conenction, others that need both for it to even turn on.

For music, especially recording, it is probably better to use an additional internal drive and keep the externals for backup, as you are doing now. IF you have the room inside..


I do not work here, but the benefits are still awesome
Make your sound your own!