Summary: I did quite a bit of research here on Amazon and other places before deciding on this particular model as my primary backup to my desktop iMac. I can honestly say, this little unit is amazing. Literally, I plugged it into the Mac using the enclosed firewire cable (which is short like others have said), a window opened on my Mac asking if I wanted to use the WD passport as my Time Machine backup drive. I said yes and with one click of the mouse, it took care of the rest.
Summary: I've had this drive for a little over a year now and I have had no problems with. It works great with Time machine. Backups and transfers are fast thanks to FireWire. The metal casing feels very solid and has protected the drive from any damage.
If you have a new Mac, dont buy this port hard drive.
Jo "perfectlycharmed", Amazon
26 August 2013
Summary: If you are planning on using this on one of the new Macs, don't bother to spend the extra $ on firewire. The new Macs do not accept firewire only 3.0 USB. If using the USB cable on this hard drive it can only do 60 MB/s (480 Mbit/s)-Not the 800 firewire you are paying the extra money for.
Summary: I'm happy for all of the reviewers who have had such a positive experience using this drive. Unfortunately, I join the chorus of the four or five users who have found that this product is a waste of money and time. I bought the drive in September 2012. I never used it with Time Machine; I just used it as a second backup drive, regularly copying my main work files and others that I wanted to archive from the iMac's internal hard drive. The drive worked OK for a while.
Summary: I've ordered a number of external hard drives on Amazon; so far, the WD My Passport Studio 500 GB is the keeper. It's portable, holds the same amount of data as my PowerBook's hard drive, and couldn't be easier to deal with--it works quite literally out of the box. Do NOT bother formatting it with the included software--your Mac knows what do do with it.