Re: Removable HD Trays?

"Mike Easter" wrote:
Timothy Daniels wrote:

Those *are* convenient if you don't have a free bay in a desktop PC.
But the internal racks which receive slide-in trays have the advantage of
providing cooling air flow for the hard drive. That air flow is sometimes
provided by fans built into the rack or tray, sometimes by the case and
power supply fans. The docking stations rely on convection for cooling.

My old IDE rack/trays didn't have fans and the plastic rack/tray didn't seem to have much 'ventilation' slits in the
design. I'm sure other designs were cooler/ better ventilated.

The description of (one of) the eSATA/USB dock at the link used the words 'cool' and 'exhaust' as if it had some kind
of fan. It has its own PS.

"This extremely cool (patented design) and remarkably efficient hard drive enclosure,... Compact docking station
design maximizes heat dissipation and exhaust."
http://www.monoprice.com/products/product.asp?c_id=103&cp_id=10315&cs_id=1031502&p_id=5330&seq=1&format=2#description
or http://bit.ly/dEaqFb

It doesn't look like it would have a fan, but would depend upon the openness for simple 'airy' heat dissipation. I'm
sorta puzzled by the use of the word 'exhaust'.


Here is a similar docking station with specs that explicitly state "No"
to a cooling fan:
http://www.tigerdirect.com/applications/SearchTools/item-details.asp?EdpNo=3516746&CatId=2785

Here is another whose specs say "Whisper Quiet operation...
no cooling fan needed":
http://eshop.macsales.com/shop/NewerTech/Voyager/Hard_Drive_Dock?s_kwcid=TC|9594|hard%20drive%20dock||S||4379737040&source=GoogleVoyager07292009&gclid=CKC7icu4s6gCFRphgwodWWuhAA

Even if a fan were supplied, where would it be put, and
how efficient would it be without a shroud to act as ducting
to direct the airflow over the surface of the hard drive?
From what I've read in hard drive NGs, though, overheating
is not as much a problem with 2.5" drives as with the larger
3.5" drives - probably due to the larger surface to volume
ratio of the smaller drives, which allows for better conductive
cooling through their cases to the air.

*TimDaniels*


.

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