• Please review our updated Terms and Rules here

Seagate ST-225 problems

Q

QuantumII

Veteran Member
Joined
Aug 12, 2008
Messages
503
Location
Oslo,Norway
Hi

When I got my XT it had an ST-225 in it. Problem is, this HDD spins up and then starts banging the head against the stop screw (at the far end of the platters).. (making a tick-tick-tick-tick noise), and the ST11 MFM controller reports NO DRIVES FOUND (or whatever the phrase is).

If I rotate the stepper all the way towards the center of the spindle, the drive will calibrate without making the ticking sounds. I have not tried this while the drive was connected to the MFM controller btw.

I assume that the ST-225 does not have a Track 0 interrupter optical switch, but some servo track embedded on one of the platters instead..

btw, I had a spare HDD for the xt, i just wonder if this HDD is possible to fix or if I should just keep it for spares..
 
I'm not sure, but oooold HDD's for mainframes had a screw keeping the head parked. Only way to unpark them is to unscrew the screw. IDK if it is the same with your drive, problably not.
 
no, the head can move allright. it just seems to be unable to sense track 0. Also, the noise the drive makes differes when the head is close to the center of the platters than when they are on the outer edge. Sounds almost like they touch the platters even when the drive is at full speed.

Maybe the platters got knocked out of aligment while being shipped (as in slightly bent casing). That's my guess
 
Scsi

Scsi

I bought used and new vintage mfm hard drives, all of them died after a short time of use.

My Vintage IBM PC and XT now have <<<<SCSI & IDE>>>>

:)

Do you like my photo, I'm Cute

10 print "insert barf icon here"
20 goto 10

error "out of memory"
 
Never mind the disgusting picture; tell us what cards you're using to run those SCSI and IDE drives in your PC/XT.
 
I'd love to know what he did to those drives to kill them. Bloody sacrilege.

All these MFM drives need is a low-level format (and maybe spindle lubrication). Magnetism is bound to have decayed during years of storage so a LLF is needed to restore them.



BG
 
BG101 said:
I'd love to know what he did to those drives to kill them. Bloody sacrilege.

All these MFM drives need is a low-level format (and maybe spindle lubrication). Magnetism is bound to have decayed during years of storage so a LLF is needed to restore them.

BG
Click to expand...
----------
Well, many of them do ultimately die, beyond the powers of LLF & lube to revive.
I could send you a few...
 
It causes all kinds of strange things, depending on what part of it goes and, to tell you the truth, I never got a straight answer out of Seagate, at the time.

It was proprietary and I never saw any information released on it. May be some around now, but, it's kinda moot, since you can't get the chip anymore (not that they'd sell it to you then either).

If you flip the drive so the logic board is up and the front of the drive is facing you, and the green solder mask is golden brown about two inches to the right of the stepper motor, that's your problem.

The number on this chip is 11665-001 and the date code, on this one, is 8605.
 
Druid6900 said:
It causes all kinds of strange things, depending on what part of it goes and, to tell you the truth, I never got a straight answer out of Seagate, at the time.

It was proprietary and I never saw any information released on it. May be some around now, but, it's kinda moot, since you can't get the chip anymore (not that they'd sell it to you then either).

If you flip the drive so the logic board is up and the front of the drive is facing you, and the green solder mask is golden brown about two inches to the right of the stepper motor, that's your problem.

The number on this chip is 11665-001 and the date code, on this one, is 8605.
Click to expand...

Nah, It's healthy green..
 
Sorry I didn't mean to sound quite so sharp in my above post. Forgot the roll-eyes smiley :blush:

I'd love to know if newer (non-bandstepper) drives can be revived!




BG
 
Custom chip problem

Custom chip problem

Just out of curiosity, has anyone ever tried cementing a heatsink to the chip ? Or do they just burn through the epoxy (kinda like a blown TO92 or TO220 transistor )rather then just overheat ?
patscc
 
patscc said:
Just out of curiosity, has anyone ever tried cementing a heatsink to the chip ? Or do they just burn through the epoxy (kinda like a blown TO92 or TO220 transistor )rather then just overheat ?
patscc
Click to expand...

From what I remember, they don't overheat, they, suddenly, just do a cascade failure.

The PCB discolouration depends a lot on how much of the chip goes nova before the VCC to ground link is lost.

In extreme cases, I've seen boards with just the pins left where the IC USED to be.

The big problem, as I later discovered, was that there was no knowing which datecodes of the chips were more or less prone to failure.
 
You must log in or register to reply here.
Back
Top