Date   : Tue, 21 Jun 1983 13:48:00-EDT
From   : MOOERS@bbna
Subject: Re: Problem with Heath Z37 controller and Tandon TM-100-4 d...

We also have some Tandon drives, which we bought about a year and
a half ago.  They are single drives, in metal cases.  We had no
trouble until a few months ago when the power supply in one drive
failed.  After we had the power supply replaced with a
reconditioned power supply, and probably unrelated to that, I
sysgenned a couple of new system disks and immediately started
getting warm boot errors, on either of two disks, whenever I
exited from a program such as an editor or a modem program, and
also (much worse) whenever I tried to write to disk from within
the program.

I found that if I opened the door of the drive and wiggled or
moved the disk slightly, the disk would reboot without fail.  I
could then write to disk, if I gave the command right away.  I
could also prevent errors by wiggling the disk BEFORE I wrote to
disk or exited from the program.  (This is clearly kludgy, but it
works, and, fortunately, SpellBinder, my usual editor allows me
to restart and capture the text in the buffer.)  After I read
your message, I tried configuring my drives to 12 ms seek time
instead of 6 ms, and I got the warm boot errors just the same.

The owner of the store that sold us the Tandons suggested that
the power supply might be running too hot.  I then realized that
I had sysgenned my new system disks when the drives were just
turned on, and therefore cold.  I have now re-sysgenned after
the system had been running for over an hour, and have had only
one "BDOS error", followed by a "warm boot" error.  So maybe I
have partially conquered the problem.  I don't know how to adjust
the temperture of the power supply.  These single drives do not
have cooling fans.  I can't tell from the catalog whether the
Heath H37 does or not.

I haven't yet looked into the SECERR counter, but I shall.

---Charlotte Mooers