This is good stuff to make note of, as I have quite a few Apple ROM drives
in various external cases with my Classic Mac parts to test and eventually
part ways with. To answer your question, an EPROM is...
Erasable
Programmable
Read
Only
Memory
They can usually be erased by exposing the window on top (often covered with
a sticker of some sort) to UV light for a period of time, then reprogrammed
later. The EEPROM is a newer verson that is Electrically Erasable.
-Chris
----- Original Message -----
From: "Scott Baret" <[EMAIL PROTECTED]>
To: "Compact Macs" <compact.macs@mail.maclaunch.com>
Sent: Monday, November 14, 2005 9:17 PM
Subject: Re: Macquarium
The Quantum drives most prone to stiction are the ones
made before late 1990. The new ones say "EPROM" on
them. The old ones have an Apple logo with a number
inside of it that specifies the size. These old drives
seem to get stiction all the time, especially the 80MB
ones. I also had a Maxtor drive go on me once.
Out of the 60 or so Conner drives I've dealt with only
one has gone. I typically replaced my stiction
Quantums with one of these or one of the newer
Quantums (the low profile newer EPROM ones).
By the way--what is an EPROM? I used to joke around it
was a formal dance for hard drives in high
school...but I really don't know what it is.
Scott
"That 40MB took the 52MB to the EPROM...their limo was
a Mac IIx"
--- Tom Lee <[EMAIL PROTECTED]> wrote:
> Well, just a quick update - I rejumped it ( trying
all the
> settings ), and I then noted that the drive wasn't
spinning up. I
> removed the top cover (invalidating the warranty!
lol ) and noticed
> that the drive didn't spin up at all. I naturally
turned it off, spun
> the platters around (by the axle, taking care not
to touch the
> platter surface). I powered it back on, and it
spun up!
You've experienced, and temporarily overcome,
"stiction" (stickiness +
friction). There are several causes, but the most
common turns out to be
a bad disk coating in some production runs of
certain manufacturers.
There's a nanoscopically thin protective coating on
some of these, and
unfortunately it can turn to a tacky glue. Old
Quantum drives from about
the 40MB generation to the 100MB generation or so
were particularly
prone to this, and so were the 20MB Sony drives that
shipped with many
SEs. I've opened up lots of those to do
post-mortems, and the head is
actually stuck to the drive surface on many of them.
If you ever get
them to spin up, don't power them back down. Back up
your data as soon
as possible, because that drive is not long for this
world.
Other sources include balky bearings (including
bearing lube that turns
gummy after some years of use). Since the head isn't
involved there,
there's less risk of disk surface damage, but you
should still replace
the drive sooner than later.
--Cheers,
Tom
--
Prof. Thomas H. Lee
Center for Integrated Systems, CIS-205
420 Via Palou Mall
Stanford University
Stanford, CA 94305-4070
http://www-smirc.stanford.edu
650-725-3709 voice, -3383 fax
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