[comp.sys.amiga] Jumpstarting a Seagate 3.5" SCSI

erick@csuf3b.UUCP (Eric Keisler) (05/13/89)

[--------------------------------------------------------------------------]
Seeing as Seagate SCSI drive problems have been discussed frequently in this
newsgroup, I thought I'd share my experience.

My ST138N SCSI drive (1yr. old) started to exhibit the infamous non-spinup
syndrome:  the drive simply wouldn't spinup when I switched on my B2000
(oh yes, the drive is installed in a Rev 4.2 B2000 with a GVP controller).
At first the problem would happen maybe once in every 10 powerups.  Then
it became more frequent.  I usually could recover by just waiting a couple
of minutes and then powering up again.

Well one day the drive seemed to have died.  No amount of powerup retrys
could bring it to life.  

I put the drive in a box and into the closet and ordered a Conner CP340.

The Conner arrived... DOA. 

While waiting for my next CP340, I decided to give my 138N another try.  After
much mucking about (I'm *NOT* a hardware type), I came up with a hunch that
the problem was somehow related to power (brilliant, no?).  Actually I surmized
that something about the way the B2000's PS comes up in a loaded system caused
me to think that the drive needed just a teeny bit more juice for its spinup
logic.  Anyway enough speculation, like I said: I'm not a hardware type.

Jump Starting a Dead Seagate SCSI:

I had an old (spare) PS from an old Rev 3.9 B2000.  So I simply put the bare
drive and PS on the table, plugged the PS into the wall and the PS's drive
power connector into the drive.

I turned on the PS and... 

The drive began to spinup eminating unusual sputtering sounds and then slowly
picked-up pitch until it reached the charcterisic normal whine.  The 
sputtering sound scared me, but I figured what the heck, it was destined for
the scrap heap anyway.  So just for grins I tried two more jumpstarts before
installing the drive.  Same sputterings, with eventual spinup.

I installed the drive, powered up (the drive came up like a champ!), ran
a zillion diskperfs, and verified that all the data on the drive survived.
The drive has worked flawlessly for over a week now.

Like I said, I'm no harware guru - I have no real explanation as to why the
"jumpstarting" worked.  But it did.  

Hmmm... what am I going to do with another 40meg when the new CP340 arrives??
I guess I'll just *have* to find a use for it ;-).

---
Eric Keisler, Computer Services, CSU Fresno

erick@csufres.CSUFresno.EDU