Donny are these proper external hard drives or are they hard drives inserted into a "CADDY" ?

If they are proper USB external drives, and you are trying to connect via the USB port on the Tyros, then perhaps your T1 DOES have the dead USB port problem. It is a chip on the USB PCB within the T1 that is the problem.

Yamaha are STILL fixing this under warranty as it is a manufacturing problem.

The T1 I had repaired was earlier this year. AND I bought it secondhand, although the original owner was not a computer person so never plugged anything into the USB port and therefore did not know.

Contact Yamaha USA and you will find that what I am saying is correct.

As to the disk now not working on the PC...simply deleting files from the hdd will NOT stop it working.

There must be something else that has happened.

Dennis