Excerpt: I had an issue with my wife's MacBook Air and need to take it in for service. Apple suggested a backup and since I didn't have an external drive for her Mac I decided to buy the Passport for Mac.
A reliable fast USB drive but get the non - mac version
James Sibley, Amazon
16 September 2013
Summary: I've used WD passports for years with good results though the spinny thing inside flakes after a year or so, much like other low cost devices. Its reasonably rugged for use with a laptop. You can tell when its getting bad when its starts taking longer to be recognized by the OS.
Summary: I read the reviews and opted for a drive that worked(was formatted for Mac) right out of the box. Worth the extra money for me, I don't have to worry about my 3 year old mac, losing all my photos, peace of mind....