
I bought this drive from Revain to back up my iMac because I was upgrading from Mac OS 10.4 .eleven to Mac OS 10.6.3 have updated. First, I made a "clone" of my system and booted it to the WD hard drive, just in case. After downloading Mac OS 10.6.3, I uninstalled the Mac OS 10.4.11 "clone" and was able to partition the drive using Disk Utility in Mac OS 10.6.3. I did this to use WD backup software for 1 partition and Time Machine for 2 partitions and I made a bootable "clone" of my system with Mac OS 10.6.3 for 3 partitions. I know this is the end but I did it to see if it would work and it does. If necessary, I can boot from WD. I think it works very well, maybe not the fastest because it's USB, but after the first backup, updating the backups with Time Machine and WD software is fast enough and they run in the background. I gave 5 stars because it does everything I expected plus a few things.

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