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Old 10-25-2005, 10:01 PM   #1
servnov
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Registered: Sep 2004
Distribution: Slackware 10.2
Posts: 276

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Can't remount USB device unless I reboot


I use
Code:
mount /dev/sda1 /where/ever
to use my usb flash drives and my digital camera. It works fine. BUT, I can only do it once. So I will mount the device and the umount it. After this I cannot ever mount any other device without rebooting. If I try I will get
Code:
not a valid block device
. My kernel is 2.4.31 running on slackware. I have had this problem on previous slackwares running older kernels too, even on different machines.

I just want to fix this annoyance to save rebooting and time.
 
Old 10-25-2005, 10:59 PM   #2
herbc
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Registered: May 2004
Location: United States
Distribution: Slackware 10.0
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Can you mount the same USB peripheral after umount? If so, then possibly the USB driver is seeing the new peripheral in a different location, requiring a mount /dev/sda2 /where/ever, etc.

I only have a flash drive, which mounts multiple times with no problems on Slack 10.0 as /dev/sda1. So I'm only guessing. But, I've seen the same problem with multiple USB printers if they are turned off and then back on in a different order, ie., they are placed on a different block device.
 
Old 10-26-2005, 01:58 AM   #3
Emmanuel_uk
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Registered: Nov 2004
Distribution: Mandriva mostly, vector 5.1, tried many.Suse gone from HD because bad Novell/Zinblows agreement
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there are bash scripts around for any stubborn devices which do not want
to get unmounted, maybe that would help, I do not have a link at hand
(maybe google umount + bash + script + stubborn ) or whatever

It could be a question of killing the process that used the usb device.
I have read as well about "usb devices that get mixed up"

Finally, I do not think you need to reboot
At worth maybe you could do

service nameofservicefor_USB restart

or maybe just remove from memory OHCI and UHCI kernel model
and then modprobe them back in
 
Old 10-26-2005, 02:09 AM   #4
AwesomeMachine
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Registered: Jan 2005
Location: USA and Italy
Distribution: Debian testing/sid; OpenSuSE; Fedora
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I have a digital camera that turns off by itself. The device node, sdb1 goes away, and when I turn it on sdb doesn't come back. I thought it was something to do with the usb hotplug driver.
 
Old 10-26-2005, 02:32 AM   #5
Emmanuel_uk
Senior Member
 
Registered: Nov 2004
Distribution: Mandriva mostly, vector 5.1, tried many.Suse gone from HD because bad Novell/Zinblows agreement
Posts: 1,605

Rep: Reputation: 53
AwesomeMachine you are right
so
service hotplug restart
might be worth testing for servnov
(even after the camera was manually added and umounted)

Does servnov has hotplug running?
servnov could probably add a line in fstab, the camera will still be mounted
only when present

I do not know in slack, but in mandy there is a libgphoto.conf
some kind of conf file in which the user sometimes need to add
the hexa ID of the camera to make it mount automatically.
A few scripts are called. I do not have the pc here to tell which one
(one is camera.sh AFAIK so even if digikam for example
does not know about the camera, it is still mounted
as usb mass storage and konqueror is launched).
Found out it worked only if I had service HAL running as well
(because one of the script uses it to id the camera)

I might be well on a wild goose chase here
 
Old 10-29-2005, 01:11 PM   #6
servnov
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Registered: Sep 2004
Distribution: Slackware 10.2
Posts: 276

Original Poster
Rep: Reputation: 30
I just figured it out!!!! If I mount /dev/sda1 and then umount I can't remount since I get the not valid block device error. However, I can mount using /dev/sdb1 and it works! Thanks bros.
 
  


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