Instant compatibility with my Mac Pro (early 2008, OSX 10.8.5) Customer Service Inateck responsive and friendly ... But I put only 3 stars because I find that when the Mac goes to sleep with a connected external HDD USB3 in (and dedicated power supply), wake up message warning me that the disc has been disconnected, the famous message we harvest if you disconnect the hard HDD without léjecter previously always thought that leaving the disc suffered and is charging us ... but I do loccurrence not think it's too serious ...