Instruct: Classify an Amazon review as either positive or negative.
Query: Great when it works but a pain when it locks up my MAC

I bought this hoping it would work out well as a external 24/7 drive enclosure. It does work but after a day or two of spin up's and down's, it locks up my MAC hard. I did narrow it down to this enclosure. I have two different ones connected to my Mini. The other will not lock the machine up. When it locks the machine finder freezes hard and I have to force quit everything and reboot. I only put a WD 500GB drive in it so the power supply should handle the load. The drive only pulls .75A. The power supply it comes with says is rated at 2 amps. I have tried changing energy settings etc. Nothing really fixes the problem. So for a occasional external drive it is OK. But, for a continuous on all the time enclosure it sucks. I am putting this on the shelf as a emergency drive tool and getting something that can take the work load.