Re: Two drives failing.....

[dempson@actrix.gen.nz (David Empson)]

<sirghoul@optonline.net> wrote:

> On Tue, 16 Jun 2009 12:20:50 -0700 (PDT), "atfphotography@gmail.com"
> <atfphotography@gmail.com> wrote:
> 
> >On Jun 16, 7:07 am, sirgh...@optonline.net wrote:
> >> Had something a bit unusual happen last night. Want to make sure I
> >> didn't overlook anything.....
> >>
> >> I have a GS with 4 drives on the smartport. two 3.5", two 5.25".
> >>
> >> Last night, BOTH 5.25" drives seem to have failed at the same time.
> >> Neither will read, although they spin up, and recalibrate fine.
> >
> >Sounds like the power supply to me.
> >
> >Have another one to test with?
> 
> Can't see how. everything else, including 3.5" drives work fine.

5.25" drives might use more power rails than 3.5" drives.

I think 5.25" drives need the -5V rail for part of the read/write
circuit (not for spinning the drive or moving the head), but don't have
a reference handy to confirm. Both types of drive use +12V for the
motors and +5V for the interface logic.

Defintely worth checking the voltages on all your power rails.

-- 
David Empson
dempson@actrix.gen.nz