How to disable APM on HDD

T

tokyojin

Hello, this is my first post on this forum and I'm almost new to FreeBSD 7.1

I'm trying to disable APM function on my WD2500BEVT HDD. Now I know that my HDD supports APM through the command below.

# atacontrol cap ad0

Previously I could disable it with hdparm command on Linux so I tried to find something like hdparm but couldn't find any...

Does anyone know how to disable APM on HDD?

-tokyojin
 
killasmurf86 said:
Why do you need that, what are you trying to achieve?
What problem do you need to fix?
Click to expand...

thanks for you comment.
I just want to disable it to avoid from frequent head unload cycles that may shorten lifetime of HDD

-tokyojin
 
I think this might be what you're looking for:

APM disable:
# camcontrol cmd ada0 -a "EF 85 00 00 00 00 00 00 00 00 00 00"

APM enable:
# camcontrol cmd ada0 -a "EF 05 00 00 00 00 00 00 00 00 01 00"

You'll need AHCI/ATA_CAM enabled for the above to work.
 
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