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:
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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;
}
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