My Passport Studio / My Book Studio don't work on USB after using Firewire400

I use My Book Studio(2TB) and My Passport Studio (500GB) on my MacBookPro.
Both are working fine as long as I use the FW400-Connection, but when I try to connect via USB the Finder hangs up.
I’ve got an older WD-MyBook-HD wich works fine though.


Have you tried using a different USB cable? Have you tried connecting the drives into a different USB port? Does the same thing occurs in a different computer?. Interesting questions to reflect about haha :slight_smile: