LinuxQuestions.org - using multiple USB flash devices

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using multiple USB flash devices

I'm having an issue using 2 differnet USB flash drive devices on my Slack 10 system running the 2.4.26 kernel. If I just use one device, everything works fine with it mounting as /dev/sda1 on /mnt/usb.

If I use the 2nd device (not at the same time but alternately), it says no device found at /dev/sda1. To get around this I have to become root, modprobe -r usb-storage then modprobe usb-storage, in effect, reload this module. Then it mounts fine. As long as I keep mounting/unmounting this same device, cool.

However, if I go back to use the first device, I get the same error and must do the same procedure to get around it. It seems the usb-storage module doesn't handle different devices without reloading. Is there a fix for this? Or, is there a way this manual workaround process can be automated?

I have the same problem. The second device is recognized as /dev/sdb1. This is interesting as i'm developing a package which autoconfigure the automounter (submount for now) and many other things. And i didn't find an answer to this problem.

I've not had any issues.

Just added /dev/sda1 and /dev/sdb1 to my fstab with the /mnt/* directory for each.

No need to modprobe or any of that. :?

I hade the same situation with memory cards in my laptop PCMCIA slot. Discovered from /var/lib/pcmcia/stab that the first card inserted into the double slot (either slot) goes on /dev/hde1 and the second on hdg1. Like sporks I just mapped /dev/hde1 to /mnt/Card1 and /dev/hdg1 to /mnt/Card2.

The solution is to use udev and hotplug.
In fact, you can create a symlink of a device probed by hotplug.
Then, you could use this symling in /etc/fstab to mount this device without knowing the real device name /dev/sd?1
A good tutorial : http://www.reactivated.net/udevrules.php

My rules :

Code:

yabon@yabon | 15:34 | ~

-> cat /etc/udev/rules.d/local.rules 

# /etc/udev/udev.rules-local:  Personal rules



# Espon Stylus Photo 890

BUS="usb", SYSFS{manufacturer}="EPSON", SYSFS{product}="USB Printer", SYSFS{serial}="XXXXXXXXXXXXX", NAME="usb/%k", SYMLINK="epson890"



# Creative Muvo TX (MP3)

BUS="scsi", KERNEL="sd?1", SYSFS{vendor}="Creative", SYSFS{model}="NOMAD MuVo TX  ", NAME="%k", SYMLINK="muvo_tx"

    

# External usb drive

BUS="scsi", KERNEL="sd?1", SYSFS{vendor}="Maxtor 6", SYSFS{model}="Y160L0          ", NAME="%k", SYMLINK="dd_externe"

Code:

yabon@yabon | 15:34 | ~

-> cat /etc/fstab 

....

# External drive

/dev/dd_externe  /mnt/dd_externe  vfat        noauto,user,umask=077  0  0

/dev/muvo_tx    /mnt/muvotx      vfat        noauto,user,umask=077  0  0

...

Quote:

Originally posted by JohnKFT
I hade the same situation with memory cards in my laptop PCMCIA slot. Discovered from /var/lib/pcmcia/stab that the first card inserted into the double slot (either slot) goes on /dev/hde1 and the second on hdg1. Like sporks I just mapped /dev/hde1 to /mnt/Card1 and /dev/hdg1 to /mnt/Card2.

Yes, I should have been more clear, the first one plugged in is /dev/sda1 or the first one from the right on the USB hub becomes /dev/sda1 then /dev/sdb1.

Hi!

When I'm trying to use udevinfo (for one of my usb sticks (which is either sdc or sdd)), I get the following message:

user@box:~# udevinfo -q path -n /dev/sdc
unable to open udev database

I'm using kernel-2.4.26 with slack-10.0 (udev-026-i486-1.tgz package ist installed).
Could it be that the udev rules could only be used with the 2.6.x kernel?

Quote:

Could it be that the udev rules could only be used with the 2.6.x kernel?

Yes. 2.4 kernels use devfs for device management, whereas 2.6 uses udev/sysfs. Therefore, udev rules do not apply to devfs (and neither do they apply to the 2.4 kernels).