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- Path: sparky!uunet!ogicse!uwm.edu!zaphod.mps.ohio-state.edu!darwin.sura.net!ukma!kherron
- From: kherron@ms.uky.edu (Kenneth Herron)
- Newsgroups: comp.sys.amiga.hardware
- Subject: A1000 floppy problems
- Message-ID: <1992Nov23.145253.25455@ms.uky.edu>
- Date: 23 Nov 92 19:52:53 GMT
- Article-I.D.: ms.1992Nov23.145253.25455
- Distribution: na
- Organization: University Of Kentucky, Dept. of Math Sciences
- Lines: 45
-
- I have an Amiga 1000 with a second floppy drive (A1010), a two-meg RAM
- board, a comspec SCSI controller, a Rejuvenater board, and a dual ROM
- board. My problem is that the floppy drives have become unreliable.
- They generally can read fine, but writing and formatting don't always
- work. Some examples:
-
- After backing up several HD partitions and reformatting the
- drive, several of the (brand new Verbatim brand) floppies
- containing the backup had read errors. They later reformatted
- fine.
-
- During a session of reformatting old floppies, more than half
- out of a stack of around 80 failed to reformat. The failure
- point on each disk was consistent. About 1/2 to 2/3 of the
- failed disks would format on a sun sparc (using an MS-DOS
- filesystem), after which they could be read on the amiga using
- MSH. Most of the disks were TDKs and Sonys.
-
- Several disks would format and accept writes fine, but later
- reads would turn up disk errors.
-
- Formatting two floppies at once failed every time, though I
- didn't try it very much.
-
- A lot of this could be explained by poor-quality or worn-out disks, but
- it doesn't sound reasonable for this many disks to go bad all of the
- sudden. So, I've been wondering about two other possibilities:
-
- One of my 8250's is flakey. However, there are no other
- problems with the system, and I did try switching the chips to
- no effect. Could an 8250 problem cause something this subtle?
-
- My power supply is overloaded and the drives are having trouble
- developing sufficient write current. I'd always heard the
- 1000's had plenty of power available, and the system isn't
- *that* overloaded. Disconnecting the external floppy drive
- gave some marginal improvement, but didn't help during the
- backup/restore fiasco, for example.
-
- Any ideas?
- --
- Kenneth Herron kherron@ms.uky.edu
- University of Kentucky +1 606 257 2975
- Dept. of Mathematics "Your ball goes over them, it sails off the edge into
- a huge cauldren of fire-breathing dragons." "And they call this a par three?"
-