Hum,
That sounds like good advice to me...
The A3000 came with a dead A3010 (880kB) or an A3015 (1.76Mb) floppy disk?
Hum, I remember that the custom chips couldn't handle the data transfer rate from the HD disks (double rate). Commodore 'solved' this by making the drive spin at half normal speed when high density disks are used...
So...
Perhaps your A3000 has improperly-wired floppy cables.
(this was the case with the A4000s)
[The cables had wires 3-5 , instead of wires 4-6 twisted. These cables will work fine for a single drive, but will not properly connect a second drive...To use two drives that are both jumpered as DF0, the floppy cable should have both wires 4-6 and 10-12 twisted. A cable with only wires 4-6 twisted will require the drives to be jumpered as DF0 and DF1.]
Is it possible to try out a high-density drive ? (er, may ONLY work with HD floppys though)
Sry, don`t have too much expierience with the A3000, but it`s my 2 cents worth... :-?
