I ordered this drive: http://www.buy.com/pr/product.aspx?sku=243030713 1.5 TB, said to be USB 3 compatible on the order page. Drive arrived today and on the box it says under OS support: Mac OS X 10.5 or later (USB 2.0 speed). The manual inside says : "As of this printing, there are no USB 3.0 host bus adapters with Macintosh hardware support. The GreenDrive3 is fully supported with Macintosh based computers via USB 2.0 connections". I haven't unboxed the thing yet because if it won't do USB 3.0 on my pending iMac (which shipped today) I will be returning the drive. I'm hoping this was printed some time ago and now the drive will be USB 3 compatible with an iMac. Anyone else seen this, or know the answer? I've sent a ticket to the manufacturer but who knows how long that will take....and if it's not compatible I want to order one that is.