Time Machine Not Recognizing External Hard Drive

I purchased this external hard drive so i could back up my 2012 MacBook Pro with time machine. I was able to format the drive for the time machine and had absolutely no issues doing it. I was also able to partition it so it can also be used as a regular drive so i can store photos and videos. Out of the box, the device was flawless and powered up immediately when i plugged it in with USB. No power adapter necessary. When it's running when its recording or reading, its silent and there are no vibrations or rattling noises. Considering the 4TB storage capacity and the fact it's not SSD, this is quite a small device. I've been using Western Digital for over a decade and have never had any issues. In my opinion, they are the best devices and i would recommend them to anyone. They are the best bang for the buck!

I bought this hard drive to use with Time Machine on my Mac. I literally just plugged it in, then the computer asked me if I wanted to use it as my Time Machine backup and I clicked yes. Presto. Done. Didn't install any software, it's just plug and play. (I had to buy a new external drive because I got a new computer and the old backup drive would be completely overwritten if I used it for Time Machine. This one is about 1/20 the size of the old. Since I work upstairs in my bedroom at night sometimes, it's nice to have an external drive that is completely portable. This way I tend to plug it in for a backup more often instead of waiting until I am downstairs again.) I actually bought an extra one for a different computer.

Purchased as a Time Machine external hard drive for my MacBook Pro. Works very well - plenty fast for backup tasks. Very quiet operation compared to the Western Digital drives I tried out. Great for long term storage of data as SSD drives are prone to data loss over time if not powered on regularly. Learned this the hard way :-/

This is my 3rd WD external hard drive and I'm loving it. I use it as my new Time Machine and repartitioned the others for storage. Simple and quick to set-up.The blue-black metal is beautiful as well. I rather like this look to the speckled surface of the other Passports.

About a year ago, my G-Technology external hard drive stopped working as my time machine backup for my MacBook Pro. I tried all kinds of stuff. Searched the Internet endlessly and boy, there are a lot of people with the same issue. I was debating whether to buy a new drive, but thought I'd try a new cable first. It's expensive, but if it works, it's worth it, and if it doesn't, I'll return it. I'm so glad I gave it a try. I followed the steps in the instructions for hook up and power and it immediately began backing up my machine! I now have three backups from today alone. Thank you StarTech!

I use the product as the external hard drive for my iMac's Time Machine. It runs quiet, is slim and is nonintrusive on the desk top. Got an excellent price and service from B&H.

Needed a small external hard drive (because of desk size) to use for my Time Machine back up. This works perfectly and was easy to set up.

Lots of room. No problems with my computer quickly recognizing it (unlike numerous other external hard drives I've used). Use them for long-term travel so the rugged body provides peace of mind. At this price, for this capacity and ease of use, it was well worth getting a second one in order to be sure many TBs of video and photo files are safely backed up.

I had trouble with Yosemite recognizing this external drive.Others have had this same problem with a variety of external drives with this OS as I subsequently found out searching the internet.The activity light would come on but it did not show up in Finder as a device or on the desktop.Kext Utility 2.6.1 was suggested as a remedy but I could never get a download unassociated with a lot of software I did not need.I left the WD My Passport 3 TB attached to my Apple MacBook Pro attached x 24 hours and for reasons entirely unknown to me,it was recognized and is working fine now.From searching the internet, this is not a unique experience. Hopefully,no further problems with the drive & Yosemite.

Excellent External hard drive.