F
Franc Zabkar
After unpacking the ISO that Seagate recently provided to address a
"bricking" bug in its Barracuda 7200.11 drives, I found the following
SD1A firmware image:
http://www.users.on.net/~fzabkar/SD1AMOOS.LOD
Peeking inside the code, I found some interesting text strings in two
sections :
Invalid Preheat
Preheat Time
Heater DAC
WrPreHt
WrHt
RdHt
Delta Clearance Due To Temperature
Read Fly Height
Write Fly Height
Write heat
Read heat
Read Fly Height = %f
Write Fly Height = %f
Preheat = %x, Write heat = %x, Read heat = %x
It seems to me that HDDs must incorporate a heater to bring the HDA up
to an optimum temperature so that the R/W flying height is at an
optimum level.
This observation is supported somewhat by a Samsung patent whose
inventors claim that "flying height drops significantly in humid
conditions" and that this can be remedied "by increasing the
temperature of the air flowing between a slider's air bearing surface
and the rotating disk surface it accesses".
Method and Apparatus Reducing Flying Height Drop in a Hard Disk Drive
Under Humid Conditions:
http://tinyurl.com/4s5brl
http://www.freshpatents.com/Method-...umid-conditions-dt20071227ptan20070297085.php
- Franc Zabkar
"bricking" bug in its Barracuda 7200.11 drives, I found the following
SD1A firmware image:
http://www.users.on.net/~fzabkar/SD1AMOOS.LOD
Peeking inside the code, I found some interesting text strings in two
sections :
Invalid Preheat
Preheat Time
Heater DAC
WrPreHt
WrHt
RdHt
Delta Clearance Due To Temperature
Read Fly Height
Write Fly Height
Write heat
Read heat
Read Fly Height = %f
Write Fly Height = %f
Preheat = %x, Write heat = %x, Read heat = %x
It seems to me that HDDs must incorporate a heater to bring the HDA up
to an optimum temperature so that the R/W flying height is at an
optimum level.
This observation is supported somewhat by a Samsung patent whose
inventors claim that "flying height drops significantly in humid
conditions" and that this can be remedied "by increasing the
temperature of the air flowing between a slider's air bearing surface
and the rotating disk surface it accesses".
Method and Apparatus Reducing Flying Height Drop in a Hard Disk Drive
Under Humid Conditions:
http://tinyurl.com/4s5brl
http://www.freshpatents.com/Method-...umid-conditions-dt20071227ptan20070297085.php
- Franc Zabkar