I see no reason why to remove the SSD. My only goal was to put a drive without moving parts and noise in the T4. (speed is no issue)
The databus in fact is not the speed bottleneck at all... it's the USB interface!
Realize that the T4 makes use of the HD in a completely different way than the instruments you mention, T4 uses it like a USB-stick and there are no processes running on/from it.
(No indexing, defragmentation, frequent writing at all!)
The T4 can run without a HDD .... what about the Wersi's??... Can they?
The SSD prices dropped to an acceptable level..... don't worry Bill.... I think I know what I'm doing