Re: Odd Flash Drive Behavior.

Mark Jarvis said:
>
> I have two flash drives: a 128MB MicroAdvantage and a 256 SanDisk secure
> digital card (relic of a camera that died) that is plugged into a
> SanDisk SD card reader. They get plugged into a USB cable which snakes
> around from a port on a USB 2 card on the back of my box to a convenient
> spot near my keyboard. Whichever one is seen first reads OK. It
> doesn't matter whether it is plugged in before or after boot.

I am a bit confused at your connection description. "They get plugged
into a USB cable..." means that two readers get plugged into one cable or
that two flash cards are plugged into one reader that has one cable to the
computer? I think I need a consice description of your media modules
(card? drive?) and how they are connected.

> The problem: if I umount the device, unplug it, then plug the other one
> in & attempt to mount it, I get a "not a valid block device" error.
> FWIW, XP has no trouble with this. XP can even tell the devices
> apart--mounts one as drive J:, the other as drive K:.
>
> What can I do to make Linux recognize the second device to be plugged
> in?

I suspect, based on assumptions about your connections, that your Linux
kernel does not support a multiple LU SCSI device. This is normal since
most kernel binaries that ship in most (all?) distros do not support
multiple LU devices.

What distro are you running and have you done any special configurations
to it after installing?

> The applicable entry in /etc/fstab is:
>

> /dev/sdb1    /mnt/usbhd    auto    noauto,rw,umask=0,users    0 0

>
> The device is "sdb1" because I have a small SCSI disk which is "sda1".

If you do need multiple LU support, you will end up with an sdc1 also.
But, before we go there, please describe your flash reader connection(s)
so we can go down the right path.

Alan



---------------------------------------------------
PLUG-discuss mailing list - PLUG-discuss@lists.plug.phoenix.az.us
To subscribe, unsubscribe, or to change you mail settings:
http://lists.PLUG.phoenix.az.us/mailman/listinfo/plug-discuss