Summary: My Apple Time Capsule crashed as soon as it was out of warranty. This 4TB drive is a superb replacement. I have it operating as a Raid 1 Firewire connected system using the Apple Time Machine software. I also made additional copies of my Music and Photo collections so as to have access to them in the event of the Apple software giving trouble in the future. The silence of the drive is astonishing. Well Done WD.
Pros: Attractive Design, Easy To Setup, Easy to use, High Capacity, Quiet
Summary: I have two -- one as a time machine on my Mac Pro (snow leopard) and the other on my Mac Mini as a server (snow leopard) for iTunes. Both are 4GB, and for the past few weeks have been working well. (I will update if there are any issues.) 1. It works for me with snow leopard. No issues. (It is listed as compatible on the box cover.) 2. For basic things, the esata works flawlessly with my Mac Pro. 3.
Summary: This will not be a long drawn out review. The drives are slow because they are "green" drives. The device runs insanely hot. The onboard processor cannot even establish advertised transfer speeds. The main board died in less than a year. WD wouldn't repair unit without my drives in it, but said they'd have to wipe them. I told them to pound sand, got a Thermaltake drive toaster and haven't looked back.
Western Digital My Book Does NOT Fully Support ESATA
11 March 2011
Summary: Beware - The Western Digital My Book software fully supports the RAID configurations for USB. BUT, esata is not supported. This means that if you are using esata in a mirrored configuration and a drive was to go bad you would not be warned that the redundancy was compromised.
Summary: I consider my self computer literate and I have not been able to install the SW for the aplications related to the external disk. I went to their website, dowloaded the SW and that did not work either. It is useless. I previously purshased an external disk of 2 TB from WD and that one worked fine.