I originally formatted the 2TB WD in the normal way, staying away from WD's "Turbo" drivers and custom GUID format. When used that way, I was getting good speeds <200 read and write. Read up a little on the WD boards, and decided that before the drive starts filling up, I'd re-format it with the WD utility and add the turbo drivers. A word of warning....Don't. Speed dropped to >100MBPS and the drive ejects randomly when accessing folders etc. I am now going to go back to where it was before....Standard OSX format. Anybody else had similar issues? I'm using the drive on my new rMBP 13"..