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From: DM on 22 Dec 2009 10:00
Hi all,

I have an external USB harddrive which I share between my Linux
Slackware 12.2 and Windows XP machines. The USB partitions are all
FAT32. All worked well during the first year of use but for the past few
months the USB HD gets frequently mounted in USB 1 mode instead of USB
2. I have no idea why this happens. I googled for it and it turns out
I'm not the only one with this problem but could not find any solutions.

I also noticed that during the shutdown procedure (via poweroff command)
the HD does not seem to be unmounted completely. That is the umount
command is issued, but when I turn off the HD it is first then that the
HD spinns down. Any ideas? Thanks.

BTW, is there a way to force the USB HD to be mounted in USB2 mode?

Here is the relevant part of my fstab:

dev/sda1 /mnt/usb1 vfat
umask=000,noexec,nosuid,nodev,rw,users,quiet 0 0
/dev/sda5 /mnt/usb2 vfat
umask=000,noexec,nosuid,nodev,rw,users,quiet 0 0
/dev/sda6 /mnt/usb3 vfat
umask=000,noexec,nosuid,nodev,rw,users,quiet 0 0
/dev/sda7 /mnt/usb4 vfat
umask=000,noexec,nosuid,nodev,rw,users,quiet 0 0
/

Dawid Michalczyk
http://www.comp.eonworks.com - Linux shell scripts


From: Bill Marcum on 22 Dec 2009 10:25
["Followup-To:" header set to comp.os.linux.hardware.]
On 2009-12-22, DM <dm(a)eonworks.com> wrote:
> Hi all,
>
> I have an external USB harddrive which I share between my Linux
> Slackware 12.2 and Windows XP machines. The USB partitions are all
> FAT32. All worked well during the first year of use but for the past few
> months the USB HD gets frequently mounted in USB 1 mode instead of USB
> 2. I have no idea why this happens. I googled for it and it turns out
> I'm not the only one with this problem but could not find any solutions.
>
I've heard that some Seagate drives do this but I don't know if there is
a solution.


From: habibielwa7id on 23 Dec 2009 10:21
On Dec 22, 5:00 pm, DM <d...(a)eonworks.com> wrote:
> Hi all,
>
> I have an external USB harddrive which I share between my Linux
> Slackware 12.2 and Windows XP machines. The USB partitions are all
> FAT32. All worked well during the first year of use but for the past few
> months the USB HD gets frequently mounted in USB 1 mode instead of USB
> 2. I have no idea why this happens. I googled for it and it turns out
> I'm not the only one with this problem but could not find any solutions.
>
> I also noticed that during the shutdown procedure (via poweroff command)
> the HD does not seem to be unmounted completely. That is the umount
> command is issued, but when I turn off the HD it is first then that the
> HD spinns down. Any ideas? Thanks.
>
> BTW, is there a way to force the USB HD to be mounted in USB2 mode?
>
> Here is the relevant part of my fstab:
>
> dev/sda1        /mnt/usb1        vfat
> umask=000,noexec,nosuid,nodev,rw,users,quiet   0   0
> /dev/sda5        /mnt/usb2        vfat
> umask=000,noexec,nosuid,nodev,rw,users,quiet   0   0
> /dev/sda6        /mnt/usb3        vfat
> umask=000,noexec,nosuid,nodev,rw,users,quiet   0   0
> /dev/sda7        /mnt/usb4        vfat
> umask=000,noexec,nosuid,nodev,rw,users,quiet   0   0
> /
>
> Dawid Michalczykhttp://www.comp.eonworks.com- Linux shell scripts

I think may the power supply of your computer is become weaker and
need to be replaced, Can you try to mount this HD on another Linux
machine and see what will happen.
Some times Linux change the driver parameters if some problem
happened, I remember once Linux identified internal sata hard disk as
hda although it should seen as sda, And that was because a driver
error or conflict, examine dmesg and see the boot error logs, You may
issue "dmesg |grep -i ata" and "dmesg |grep -i sda" and so on, May you
find what's wrong there.
From: Hactar on 3 Jan 2010 22:16
In article <4b30dce4$0$36587$edfadb0f(a)dtext01.news.tele.dk>,
DM <dm(a)eonworks.com> wrote:
> Hi all,
>
> I have an external USB harddrive which I share between my Linux
> Slackware 12.2 and Windows XP machines. The USB partitions are all
> FAT32. All worked well during the first year of use but for the past few
> months the USB HD gets frequently mounted in USB 1 mode instead of USB
> 2. I have no idea why this happens. I googled for it and it turns out
> I'm not the only one with this problem but could not find any solutions.
>
> I also noticed that during the shutdown procedure (via poweroff command)
> the HD does not seem to be unmounted completely. That is the umount
> command is issued, but when I turn off the HD it is first then that the
> HD spinns down. Any ideas? Thanks.

My USB HDs don't spin down on umount, so while possibly undesirable, that
is not unprecedented. I borrowed one from my friend (no idea what it is
on the inside, besides 750GB) that does a force umount if USB becomes
unpowered (e.g. if I turn off the monitor through whose USB port it's
connected). Spin down is one thing, but completely shutting down is
another.

> BTW, is there a way to force the USB HD to be mounted in USB2 mode?

Does the "mount" command show it as mounted when you think it shouldn't
be?

--
-eben QebWenE01R(a)vTerYizUonI.nOetP royalty.mine.nu:81

A neutrino enters a bar. The bartender asks "Can I get you anything?"
The neutrino replies "Nope, just passing through." -- rdu_voyager on Fark
From: J G Miller on 4 Jan 2010 09:21
On Sun, 03 Jan 2010 22:16:20 -0500, Hactar wrote:

> I borrowed one from my friend (no idea what it is on the inside,

Monitor the output of dmesg immediately after connecting it with
the USB cable and you should see some identifier for the disk.

For example,

[ 8.796141] usb-storage: device scan complete
[ 8.804434] scsi 6:0:0:0: Direct-Access WD 10EAVS External
1.75 PQ: 0 ANSI: 4
[ 8.897221] sd 6:0:0:0: Attached scsi generic sg5 type 0

In the above WD indicates Western Digital and a web search on 10EAVS
reveals further details about the model.
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