Messages in this thread | | | Date | Thu, 07 Jul 2005 19:02:04 +0200 | From | Clemens Koller <> | Subject | Re: IBM HDAPS things are looking up (was: Re: [Hdaps-devel] Re: [ltp] IBM HDAPS Someone interested? (Accelerometer)) |
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Hello,
Just for the records.... ----- root@ecam:~$ ./headpark /dev/hda head not parked 4c -----
HDD is a desktop Maxtor Diamond MaxPlus 9 120GB on a Promise Ultra133 TX2 IDE Controller.
Well, sure, it's not a notebook HDD, but maybe it's possible to give headpark a more generic way to get the heads parked?
Are the commands different per HDD model / manufacturer? Then we might need some information to send the proper commands to the different types?! And if there is no headpark command, might it be valuable to send the HDD a shutdown instead?
PS: I'm working on an embedded PowerPC (MPC8540) system which will be turned into a high-resolution portable camera in the future (with acceleration sensors for the right image orientation). Therefore it will likely be another candidate for a Drop'n'Park or Drop'n'Stop (tm) feature as are planning to put a 2.5" notebook HDD into the cam, too.
Greets,
Clemens Koller _______________________________ R&D Imaging Devices Anagramm GmbH Rupert-Mayer-Str. 45/1 81379 Muenchen Germany
http://www.anagramm.de Phone: +49-89-741518-50 Fax: +49-89-741518-19
Jens Axboe wrote: > On Mon, Jul 04 2005, Jens Axboe wrote: > >>On Mon, Jul 04 2005, Lenz Grimmer wrote: >> >>>-----BEGIN PGP SIGNED MESSAGE----- >>>Hash: SHA1 >>> >>>Hi, >>> >>>Jens Axboe wrote: >>> >>> >>>>It isn't too pretty to rely on such unreliable timing anyways. I'm >>>>not too crazy about spinning the disk down either, it's useless wear >>>>compared to just parking the head. >>> >>>Fully agreed, and that's the approach the IBM Windows driver seems to >>>take - you just hear the disk park its head when the sensor kicks in >>>(you can hear it) - the disk does not spin down when this happens. >>> >>>Could this be some reserved ATA command that only works with certain# >>>drives? >> >>Perhaps the IDLE or IDLEIMMEDIATE commands imply a head parking, that >>would make sense. As you say, you can hear a drive parking its head. >>Here's a test case, it doesn't sound like it's parking the hard here. > > > 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. > > > #include <stdio.h> > #include <unistd.h> > #include <fcntl.h> > #include <string.h> > #include <sys/ioctl.h> > #include <linux/hdreg.h> > > int main(int argc, char *argv[]) > { > unsigned char buf[8]; > int fd; > > if (argc < 2) { > printf("%s <dev>\n", argv[0]); > return 1; > } > > fd = open(argv[1], O_RDONLY); > if (fd == -1) { > perror("open"); > return 1; > } > > memset(buf, 0, sizeof(buf)); > buf[0] = 0xe1; > buf[1] = 0x44; > buf[3] = 0x4c; > buf[4] = 0x4e; > buf[5] = 0x55; > > if (ioctl(fd, HDIO_DRIVE_TASK, buf)) { > perror("ioctl"); > return 1; > } > > if (buf[3] == 0xc4) > printf("head parked\n"); > else > printf("head not parked %x\n", buf[3]); > > close(fd); > return 0; > } > - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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