Western Digital MyBook Studio Edition II
I was confused when a user recently decided to use a relatively new external hard drive, but it wasn’t mounting on her computer. It looked like the computer didn’t even recognize that the drive was attached. She was using a Mac, and Disk Utility wasn’t seeing the drive at all when connected via FireWire 400. The odd thing was that I remembered partitioning the drive on my computer. As it turns out, there is an interesting issue, where USB (the method I connected the drive) works fine, but FireWire wouldn’t see the drive. I started to wonder if I had to contact Western Digital about this issue, when I decided to check to see if there were any firmware updates. Sure enough, there were:
http://support.wdc.com/product/download.asp?groupid=114&sid=58&lang=en
The firmware update fixed the issue, and she is happily working with her external hard drive through FireWire.
Xakriel's Tech Support Blog 
[…] I was confused when a user recently decided to use a relatively new external hard drive, but it wasn't mounting on her computer. It looked like the computer didn't even recognize that the drive was attached. She was using a Mac, and Disk Utility wasn't seeing the drive at all when connected via FireWire 400. The odd thing was that I remembered partitioning the drive on my computer. As it turns out, there is an interesting issue, where USB (the me … Read More […]
Western Digital Green drives seem to not eject themselves like other green vendors. I thought you may like to know this in case you come across misbehaving drives.
http://chimac.net/2010/03/06/is-your-external-hd-ejecting-itself-on-your-mac/