No worries, may be a stupid question but is the patch at the bottom of your user-startup sequence?
Also you must close J301 on A2000 (DF1 as HD Floppy Drive) and check the the floppy drive cable is installed correctly, seems obvious but check all the pin are not bent and you have no tears or kinks in the cable.
try this format tool, see what happens
http://aminet.net/package/disk/misc/Formatter