From: Arno on
Franc Zabkar <fzabkar(a)> wrote:
> On Tue, 04 May 2010 09:18:02 +1000, Grant <omg(a)> put finger
> to keyboard and composed:

>>Interesting, only recently I came across a HDD that shorted out one of
>>the rails, I didn't think to check for a TVS gone short, just assumed
>>from quick look those things were caps across the supply.

> Other manufacturers sometimes place a fuse in series with each TVS
> diode.

In which case the drive will just not power up.

> Shorted protection diodes are a very common problem, especially in
> external drives. People often plug a 19V laptop adapter into a 12V
> drive ...

There is a reason for those protection diodes...

Arno Wagner, Dr. sc. techn., Dipl. Inform., CISSP -- Email: arno(a)
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Cuddly UI's are the manifestation of wishful thinking. -- Dylan Evans