ASE Labs posted a review on the WD My Passport Studio 250GB USB Mac

Western Digital is well known to system builders and end users for providing excellent storage solutions matched with a good warranty and support. I only recommend two hard drive manufactures to people, Western Digital is one of them (the other being Seagate). The latest and greatest things in terms of technology have moved out of the computer case and into portable storage. The My Passport Studio comes in at 250GB and this one is preformatted for Mac. Don't let that scare you, though.

WD My Passport Studio 250GB USB Mac Review