Re: SATA - PATA Bridge Trouble

> > > If you're really stuck, email me via my website and I will send you a
> > > Maxtor OneTouch housing - of which I have plenty - but you will need a
> > > 12v DC power supply for it. Just use the carcase which contains the
> > > electronics and not the entire shell, which is effectively
hermetically
> > > sealed and will cause your drive to fail.
> >
> > From the fact that hard drive is effectively hermetically sealed in
> > enclosure, you cannot conclude that is going to overheat and fail. Hard
> > drive temperature does not neccesarily have to exceed operational
limits. It
> > all depends on how efficiently external enclosure is cooled and what
thermal
> > resistance exists between hard disk and enclosure.
>
> For starters, I have boxes full of OneTouch cases, the hard drives from
> which I have returned to Maxtor for RMA replacement. I keep the power
> supplies as they are useful, but most of the external housings just go
> in the bin.
>
> I can assure you, anything placed in a OneTouch drive is a disaster
> waiting to happen.
>
> No cooling whatsoever. No heatsinks. No vents. Thermal resistance?
> You mean a few millimetres of fresh air? That the best you can do?

I'm not sure what are you asking.

Hard disk generates heat. External surface of enclosure dissipates heat.
Temperature of hard drive is Thd = Tamb + Phd*(Rhd_enc+Renc_amb).
You can exceed operational temperature of hard disk if:
1. ambient temperature (Tamb) is too high
2. hard drive is thermally insulated in enclosure (Rhd_enc)
3. enclosure is not cooled properly (Renc_amb)
4. hard disk generates (Phd) to much heat

So with given hard disk and enclosure I can still make sure that Tamb and
Renc_amb are as low as possible. If hard disk does not work too hard too
often, it also lowers average Phd. All of that prolongs hard disk life.

> But you're right to a degree - put a decent hard drive in there, and it
> may last a few months. Put a Maxtor drive in there, and you're asking
> for trouble.

Because Maxtors tend to generate more heat than other brands, they increase
chance of overheating.

> If you think for one second (and clearly from your post you *do*) that
> placing a hard drive in a hermetically sealed enclosure is not an issue,
> then think again.

"Is not an issue?", it might not be an issue if extra care is provided.

> You might work from paper - but I work in the real world. The two yield
> very different results.

What paper? What results?


.

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