Re: Head parking (was: IBM HDAPS things are looking up)

[Lenz Grimmer <lenz@grimmer.com>]

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Hi,

Jens Axboe wrote:

> ATA7 defines a park maneuvre, I don't know how well supported it is 
> yet though. You can test with this little app, if it says 'head 
> parked' it works. If not, it has just idled the drive.

Great! Thanks for digging this up - it works on my T42, using a Fujitsu
MHT2080AH drive:

  lenz@metis:~/work/ibm_hdaps> sudo ./headpark /dev/hda
  head parked

Judging from the sound the drive makes, this is the same operation that
the windows tool performs.

However, the head does not remain parked for a very long time,
especially if there is a lot of disk activity going on (I tested it by
running a "find /" in parallel). The head parks, but leaves the park
position immediately afterwards again. I guess now we need to find a way
to "nail" the head into the parking position for some time - otherwise
it may already be on its way back to the platter before the laptop hits
the ground...

Thanks again - this is another helpful bit in getting all the pieces
together.

Bye,
	LenZ
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 Lenz Grimmer <lenz@grimmer.com>                             -o)
 [ICQ: 160767607 | Jabber: LenZGr@jabber.org]                /\\
 http://www.lenzg.org/                                       V_V
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