Doing a sudo find, the items I found are at these locations:
/Library/LaunchDaemons/com.wdc.drivemanagerservice.plist
/Library/Application Support/WesternDigital
The first one is a daemon that you'll need to unload with this command:
sudo launchctl unload /Library/LaunchDaemons/com.wdc.drivemanagerservice.plist
To verify it's been unloaded, execute this command:
sudo launchctl list | grep -i wdc
Next, remove the daemon descriptor file:
sudo rm /Library/LaunchDaemons/com.wdc.drivemanagerservice.plist
After that, remove the folder. Either copy/paste this exactly or make sure you type it exactly since the "rm" (remove) command doesn't just put things in the Trash, and the recursive/force (R and f) options can be dangerous if you give it the wrong path to remove.
sudo rm -Rf '/Library/Application Support/WesternDigital'
I'm using my My Book Studio II by way of eSATA (PC Card in a MacBook Pro 17") rather than USB or FireWire, but I do remember that to configure it after buying it, I had to plug it in as USB rather than as FireWire or eSATA, so my guess is that the problem may be due to the device being plugged in by another manner than USB, and Mavericks somehow is doing something different with the IO registry than the software expected, causing the WD software to send a reconfigure or erase command. If anyone has had these problems with a USB connection, please add that to this forum. If not, feel free to include what connection you had that was present upon loss. Thankfully I haven't upgraded to Mavericks yet.