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: This is a great, fast and reliable little external hard drive. Firewire adds so much speed and the portability is awesome. I bought the refurb model and saved even more. This is the best price I could find for such a great little hard drive. We travel a lot with these, in the US and overseas, and find WD to be one of our favorite brands. Highly recommend this brand and this product.
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: This is pure junk, don't waste your money. I had this for a total of 6 months and it worked until yesterday. Now I can't access my files because the data structure is corrupt and unreadable. Online help told me to format the disc to fix the error. I did this and one day later, it happened again. Do not use as a backup. This is less reliable than a flash drive. DON'T WASTE YOUR MONEY!
Summary: I bought the 1TB version of the hard drive. I came pre-formatted for the Apple Mac and could start using it right off. It has two Firewire ports to allow you to daisy-chain more drives, though I haven't tried this as of now.