Something is wrong with the floppy drive in my TDS5054B. For some reason it only lets you format disks as 720KB and when you try to use them in another PC, it can't read them. Also, if you insert a 1.44MB Floppy from another PC, the Tek can't read it. I'm assuming the drive is bad.
It looks to be a USB drive, but is connected directly to the USB pin header on the motherboard. Unfortunately I didn't take a pic when I had it out. It has as 4 pin connector on it, not a wide ribbon cable.
Maybe someone has a TDS5054B carcass around with a good drive in it. Located in NY, USA.