Caveat: It's a 1TB not a 500GB. Sorry.
Here's what I've got: A Western Digital 500GB RAID MyBook Pro II. It is connected to a Dell Inspiron 9400. I, along with my colleagues, are all using Windows XP Pro. I currently have a WD 120GB External HDD at the moment we use to share files. It's getting very full.
I tried hooking up the MyBook Pro II HDD to share. I can see it and all the files placed on it as a drive on my computer, and I can share the drive giving everyone in the office full rights, but no one is able to access the shared drive over the network.
Oh, I did call WD's support. I got to an outsource company in India, who barely could read the instruction manual! That frustrated me, so I ended the call with no help.
Is the problem due to it being a RAID? This drive was not my choice of share drives to use.