have either of your guys contacted western digital? I am wondering if there is a firmware upgrade that may be available for your drives. This sort of problem sounds awfully buggy unless you are running identical computers with identical operating systems and even that is remote. Simply out of curiosity, do both of you religiously use the shutdown button in windows as opposed to old fashioned people who just turn off the computer? Second, do you guy's have UPS systems? if you don't during the time frame this occurred, have you experienced any power outages or brown outs that you know of?
I only bring this up because the most common way to corrupt "any" hard drive and I presume flash drives as well is to pull the plug during the writing of files (not reading) there is a cache on the drive to be concerned with and many operating systems have a checkbox to speed up hard drive access for non removable drives indicating write cache enabled. That delays immediate transferring of data to be written and sort of spools it like a printer but could fry your partition table if lost power occurs at a time like this. Removable drives such as flash or external usb/firewire drives are not as prone to this if the default of "optimize performance" is not checked. This bypasses any operating system caching of your data.
Probably more info than you guy's cared to know, but consider it food for thought. Personally if either of you or anyone else reading this thread wants some advice from a pro. The ultimate insurance policy is a UPS. Most people hear that and think immediately big bucks. Well on sale right now is a respectable powered UPS by Cyberpower on sale nationwide in the USA from bestbuy with an instant discount (no mail in rebates) for $29.99. I have a couple of these units myself. The only thing that these models don't support is USB monitoring however they do have a serial port which can be converted if your computer doesn't have serial support. Also, a safe bet would be to plug just your computer into this and not anything else on the battery side because 425VA is not enough to keep both running for any reasonable period of time. But this is great for short little power outages and if you can get a serial connection, you can have the free software shutdown your computer automatically on a customized power outage schedule.
Also they have a nice size 685VA UPS on sale for $59.99 which will keep your computer, monitor, and maybe a few extra external goodies powered up. (Don't use the battery side for printers)
but this 685VA has serial & usb support for monitoring on your pc.
This is the link for the $29.99 425VA Model
This is the link for the $59.99 685VA Model
Sale is good until July 19, 2008 at bestbuy.com or stores.
For the 685VA
* 8 total outlets, all with surge and 4 with battery
* 685VA rating with 390 watts of power
* 890-joule surge energy rating
* Battery run time up to 70 minutes
* Phone/fax/modem/DSL communication protection ports
* Automatic voltage regulator
* USB/serial connectivity
* Shutdown software included
* CyberPower $125,000 connected-equipment warranty