CompuServe Messages

I just installed a 2010 internal 3 1/2" floppy drive in my Amiga 2000, and am having some serious problems with it. If anyone else has had similar problems, I'd like to hear about it. Basically, if I insert a disk that already has data, the system is able to read a little of it– show a directory, run a program, etc.– but then, very quickly, it displays "read/write error" message. Then, the disk is lost. Whether I hit "Retry" or "Cancel", a disk corrupt message soon follows, and the disk becomes unusable in any drive. If I insert a new disk, with no data, and try to format it, I get an "Initialization failed — no sector header — try a different disk." Finally, if I run DiskDoctor on a disk as a result of the "Disk Corrupt" message, it starts ok, but then produces a list of "Hard Errors" that generally are on or around tracks 40-60. And, when done, it says the following: "Unable to read disk type – formatting track zero;" "Unable to write to root – formatting root track;" and "Cannot write root block – Sorry!" So, frustrated, I brought the drive back to the dealer, got a new one, installed it– same problems. Then, afraid perhaps it was in fact the 2000, I figured I would try switching the cables– in other words, use my DF0: as DF1:, see if that worked. Well, here's what happened when I did that: DF0: still responded as DF0:, despite the fact that it was plugged in as DF1:– okay, no problem, obviously the disks physically identify their logical device number. The lights, however, lit up on the opposite of the active disk– ok, also no prob, obviously the computer controls the lights separately from the drives. BUT, and here's the confusing part, in this twisted, reverse configuration, BOTH DRIVES WORKED PERFECTLY. What is going on here?? I can think of no explanation for it, especially this last part. If anyone can offer any assistance at all, or even just an explanation, I would greatly appreciate it.