Until the new Mac Pros are released this is my go to backup
596449
Filled up my old backup and bought this one as a bridge to span the gap of nothingness that is Apples attention to it's Pro consumers. Works great for the price and does the job I intended it to do effortlessly
4175766
I just purchased a new iMac and Macbook Air and am continuing to use the old eMac.  I needed a drive with the capacity to backup all three computers.  I use the WD My Book Studio as my offsite storage device so it does not stay connected to a computer all the time.  I connect it to the computer being backed up, run the backup and then disconnect the WD.  After all backups are complete, I take the drive to my offsite storage location.  The WD My Book Studio has done the job without any problems.
2397312
I have a new Mac Pro (11/2015) and this compliments it perfectly. I just plugged in the USB cable to the Mac and it worked immediately. It is a little flimsy, but what do you expect for a portable version at this price point?
2412576
This is a simple way to back up my Mac, even though it was not created for the Mac. It works really well. I am not a techie, but this is easy.
401628
This item has been wonderful from day one. Being able to have large amounts of data available anywhere in my home and anywhere else for that matter is a beautiful thing! I have had no issues getting this to work in an Apple home (Macbook Pro, Macbook Air, Apple TV, iPhones, and iPads) I only subtract one star because for some unknown reason, it just freezes once in a while and is quickly fixed by a soft reboot. This is really only annoying during a backup but once fixed the Macs resume the backups and all is good in the world again. Either way, I have lost no data and the product has been great to date!!
3669289
I got a used mac pro off craigs list, and wanted to utilize it's much spaceness.  Thus I decided to purchase this sizable hard drive.
I partitioned it: 1TB & 500GB. I'm using the second 500GB slab for a dual boot of fedora.  It's a really annoying process, but you'll be happy to know that this hard drive has continued to hold all my data as promised.
4464144
I am running a Mac 10.6.8 desktop and ordered the My Book for Mac as a back up.  The hard drive arrived early, great packaging, and with just a couple of clicks teamed with Time Machine to back up all the data.  The My Book is compact and quiet and I do not need to eject the drive when shutting down the computer.  I would recommend this drive to anyone requiring a backup for their Mac.
3398654
My new Mac Pro is the most powerful mac I have ever owned. I use my Mac for my job as a graphic designer plus so many more things like media center for my Apple TV and ITunes storage with the help of the additional drive bays which I loaded with 2 3TB hard drives. This Mac makes every day tasks simple to organize and keeps me updated with text messages and email. The best Mac I have ever owned.
2900961
I use this as extra storage and backup for my Macbook Pro.  I love that it sits nearly flush with my laptop and I never take it out.  It's much faster than the old USB 2.0 version, so if you're computer has the fast ports I'd totally recommend this.
4655117
I've used the .Mac service since it came into existence. Love the great new features and the 10g limit. I use filechute with it and makes it easy to move my large files.
520684
With this upgrade, I have extended the working life of my Macbook and avoided having to buy a new Mac.

I update my (now older) Macbook internals as new technology becomes available - first a Superdrive, then 6GB of RAM, a 200GB HD followed by a 320GB HD, then a 500GB HD and now this new 1TB HD. This drive IS taller at 12.5 mm high and it is IS a very tight fit in the polycarbonate (plastic) Macbook, but it does fit and work perfectly.

Shutdown your Macbook, remove battery, remove RAM/HD cage (3 #0 Phillips screws) and remove your old drive. Transfer the drive cage (4 small Torx screws), lay the new drive flat in the battery compartment and use a bit of steady force to slide it into the drive bay. IT WILL FIT - there is a tiny lip that adds resistance but you will not damage anything nor hurt the computer. Slide it all the way home, lay the white HD pull tag under the RAM/HD cage and reassemble. Total time, perhaps 5 minutes.

Use Carbon Copy Cloner (free) or Superduper! (paid) to clone your old drive and you are good to go. My old drive was a 7200rpm 500GB HD, and this new 1TB is a slower 5200rpm HD - but if your old HD was almost full, you will notice that the Mac appears faster and responds much quicker as it has more contiguous HD swap space.

Enjoy your new expansive space.
4049200
Open the package, pop this into to the slot on the side of you MacBook Pro 13 and bang, you have an extra 128GB of storage.  It shows up as another drive but it never goes away.  I don't have to worry about getting a notice that the drive was not ejected properly because it never leaves my MacBook Pro.  I story all my photos and music on this drive and just about anything else I need.  Sure comes in handy with the origina 256gb SSD I had already in my MacBook Pro.
508653
This is a backup for the one I am using now - several years old.
1251402
I recently bought a new iMac and immediately fell in love with the Leopard operating system(I'm someone that uses both Vista and Leopard now, and as much as I hate the advocates on either side, I'm finding myself using the Mac all the time and only using my Vista box when I'm forced to). One of the features I was looking forward to using was Time Machine, which for those that aren't familiar is a new program in Leopard that automatically(automagically?) backs up your entire Mac and then does hourly backups of any changes that occur thereafter. Wow. Erased an email yesterday that all of a sudden you wished you had today? Go to Mail, click on Time Machine and then go back in time to when that email still existed on your machine and recover it. Awesome. Simple. So enough about that.

Obviously you need a drive to do this, and I didn't have one until the other day when I bought this WD My Book. I plugged it in and immediately Leopard spotted it and asked me if I wanted to use it for Time Machine. I sure did! It's quiet, it's cool to the touch, and it looks cool as well! It matches my Aluminum iMac. The only downside is I hate the light on the front, which is easily solvable...I turned it around!

Now if my Mac ever crashes, I can be back to exaclty where I was within 15-20 minutes. Brilliant. Thank you WD and thanks Apple for making this software a part of your base OS.
4358308
You really cannot go wrong with this drive.  I have never seen a bad review and personally, I have owned four.  The previous units were the 1TB version and now with expansion, a 2TB.  I've had them run individually, run daisy-chained, run mirrored, basically any configuration reasonable and they just work flawlessly.  I've had running my Apple backup for ages and it works great.  I had tired a cheaper, inexpensive USB only 1 TB and it just cannot handle the constant use well.
4526756
I've had this drive for a few weeks now. It is super sleek looking and it sets on the base of my IMac. The silver color is a perfect match. It looks like it is part of the computer!  I use it with Apple's Time Machine. It has worked flawlessly from the first back-up which took only about 4 1/2 hours. Not bad considering I had about 360 GB to back up and I used the USB  connection to do it. Apple's Time Capsule takes longer than that even with a direct ethernet connection. I have not tried firewire yet since many of the reviews say it has bugs; but I am sure WD will come up with a firmware fix and I noted that most of the complaints were from Mac Book users. I have an IMac and I think it has something to do with the power connection to the Mac Book since these drives are self-powering. I suspect that firewire will work just fine with an IMac.  I am going to buy a new Mac for my other house and I intend to take this drive with me to transfer everything to the new computer. I am very pleased with this product and I got a super good  price from Amazon seller charlie902.
2081698
I won't say as much as I normally would if this were a standalone review, as other reviews here have covered much of what I would have included otherwise.  What I would like to strongly emphasize, however is the following:

1. My installations of 10.6 on my Macbook Pro and my Mac Pro both went flawlessly.  I had zero issues with the install.  I did, however, WAIT until I was sure that there were 10.6 compatible drivers for my scanner, printer, and Wacom Intuos4 tablet, and that steermouse and Carbon Copy Cloner also had 10.6 compatible versions.  At this point in time, most such issues have been resolved, but it is worth it to make sure that is the case, and to wait until you are sure.  In very few cases is there a great rush!  A couple weeks won't be a big deal.

2. BACKUP BEFORE upgrading!  Just because most peoples installs will go flawlessly is no guarantee yours will.  You always want to be able to step back if you need to!  A time machine backup is good, but a SuperDuper or CCC image of your system drive is better, in my opinion.  Some programs (PSE comes to mind) will not work properly when restored via migration assistant and a time machine backup.  Also, keep in mind that if you do do a clean install that the iLife programs won't be there.  You will need to install them from your original install discs that came with your mac.  There is an option to install bundled software only.  However, I would recommend just doing the straightforward install, except I would say customize it and just pre-emptively install Rosetta and QT7.

3. Don't expect awesome improvements in speed.  You will be disappointed if this is your reason for upgrading.  Also, note that some things may be different that annoy you.  Check out a detailed review if these sorts of things push you over the edge (and have a backup so you can revert if you like).

4. Finally, and most importantly, please understand that Snow Leopard is much more POTENTIAL awesomeness that will be realized in the future, than ACTUAL awesomeness that will manifest as soon as you boot into it.  See, at this point, processing power is increasing not via increasing clock speed and kflops increases of a single core, but is being increased by increasing the number of cores per CPU, and even the number of CPU's per computer (and don't forget the GPU).  This increase is real, but is currently NOT utilized by most softare.  The issue has to do with the difficulty of writing code for parallel processes and breaking tasks into threads.  If you read the Ars Technica review of Snow Leopard, you will get some very detailed info on the problem, and on Apple's approach to it.  The incredible thing is that according to informed opinion (or some of it, anyway), Apple REALLY DID more or less solve this thorny problem by providing new tools for PROGRAMERS to write code that will take advantage of all that processing power sitting idle.  Note especially the AT discussion of queues and how they provide a powerful and easy to use tool for programmers.  So, anyway, whether or not you understand all the technical details, the point is just that in a year or two, you will start to see OS X programs written for 10.6 really make waves with serious performance increases.  Then you will get awesome improvements in speed in many cases.

Snow Leopard is laying the foundation for excellence.  I am very happy and impressed that Apple took the time and effort (and risk) necessary to do this.  It will pay off in a big way!  Just wait and see!