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

Lenz Grimmer
2005-07-07T08:41:42Z

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

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
- --
- ------------------------------------------------------------------
Lenz Grimmer <lenz@grimmer.com> -o)
[ICQ: 160767607 | Jabber: LenZGr@jabber.org] /\\
http://www.lenzg.org/ V_V
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.4.0 (GNU/Linux)
Comment: Using GnuPG with Thunderbird - http://enigmail.mozdev.org

iD8DBQFCzOqlSVDhKrJykfIRAlm0AJ9WvadtsxAdLdTCe40N/KDbvSLf5wCdEWWA
OsiXzwFjziNuKvK5HKSMjb4=
=qXXH
-----END PGP SIGNATURE-----