Bought myself a Vantec USB2 External HDD case with it's own PSU. Added to that a cheap 300GB Samsung HDD.
My Mouse is USB in a PS2 adaptor because my KVM doesn't do USB.
If I boot with the USB HDD plugged in, the mouse goes doolally, and won't work properly even if you remove the HDD. If I bought with the drive unplugged, the mouse is fine, but when I plug the drive back in, even though it assigns the same letter, it loses the network share.
Any suggestion? Mouse is a Maplin branded wireless optical. KVM is a Dakota Scout 4 PC HDD case is a Vantec NexStar3. Hdd is a samsung (slow but I've found reliable).
Tried all the available USB2 ports on the PC. It doesn't affect any of the other PCs that the KVM is plugged into, just the one the at the HDD is connected to.