> I am a bit confused at your connection description.
There is one cable. Plug a flash drive (A) in. It works. Umount it. 
Unplug it. Plug the other drive (B) in. Issue mount command. New drive 
(B) won't work. Unplug (B) & re-plug original drive (A). Mount (A). 
Drive (A) works. It doesn't matter which drive is mounted first, the 
attempt to replace it with the other always fails.

-mj-

Alan Dayley wrote:

> 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
> 
> 
> 
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