[kwlug-disc] Checking a USB disk for errors

John Johnson jvj at golden.net
Fri May 16 09:30:09 EDT 2014

On 2014-05-15 21:55, Khalid Baheyeldin wrote:
> The problem is that it is taking many hours now, with the laptop 
> heating up (73C to 81C).

IMO I find it curious that "laptop" PC should not be used on one's lap 
for the very reason that Khalid mentioned above, temperature.

The electronics devices, cpu, etc, inside the device generate heat when 
operating, particularly when performing a task that is cpu intensive.
Similarly, the mechanical component, the HDD which has a motor and a 
solenoid actuator, generates heat when operating.
And a HDD diagnostic would be very demanding on the last item above due 
to the repeated actions required.

With drive to make the "laptop" enclosures compact and thin the 
mechanisms to dissipate the heat generated inside become very complex.
These mechanisms include traditional heat-sinks which radiate heat into 
air passing over fins to cool components mounted to the hear sink.

For heat sinks to work effectively the apertures that allow air to move 
into and out of the "laptop" enclosure must be free of dust and other 
obstructions like, for example, one's clothes if the "laptop" is on 
one's lap.

Other mechanisms include "heat pipes" that carry heat from internal 
components to the outside surfaces of the "laptop" where the heat is 
radiated into the surrounding environment.

The mechanism by which heat pipes carry this heat is explained here: 

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