Summary: I opened the enclosure and used the drive itself. The drive is a Toshiba MQ01ABD100. This drive has 3901 power on hours for me so far but is pretty lightly used (132 power cycle count). The enclosure is secured by snaps that don't need to be broken to be opened and can be reclosed really easily just need to be careful (I started at the side opposite the connector.) The USB 3/SATA board just plugs into the drive and sits there so is very easily reused/removed.
Summary: I bought this external HDD, to transfer my music and movies as I have have 500GB worth of it so I could sell my laptop and transfer it to my new laptop that I am going to buy, this HDD performs very good, speeds are quick.
Pros: Fast, light, no power cable and alot of space!