Model: HTS548080M9AT00 (Hitachi) Laptop: T42. segfault:/home/spstarr# ./a /dev/hda head parked
Seems to park, heard it click :) Shawn. On July 7, 2005 04:48, Jens Axboe wrote: > On Thu, Jul 07 2005, Lenz Grimmer wrote: > > -----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: > > > > [EMAIL PROTECTED]:~/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. > > Very cool, I wasn't sure if this was a 'new' feature waiting to be > implemented in drives or if ata7 just documented existing use in some > drives. > > How long did the park take? Spec states it can take up to 500ms. > > > 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... > > The head just remains parked until the next command is issued. This > needs to be combined with some ide help, to freeze the queue. Perhaps > some sysfs file so you could do > > # echo park > /sys/block/hda/device/head_state > > Or whatever, at least just exposing this possibility so that the drive > internally can block future io until a 'resume' command is issued. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
