(see in line)
Alan Dayley wrote:
> Mark Jarvis said:
>
>>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.
>
>
> Please confirm my assumptions as follows:
> - You have one slot for a memory card in one card reader.
> - This one card reader plugs directly into the USB port on the computer.
> - You have two SD flash memory cards that you insert, in turn in the one
> slot.
Nope. One device is a standard flash memory "thumb" or "lipstick"
drive. It plugs into a standard USB port. The other device is [a SD
memory card more-or-less permanently inserted in a SD card reader].
(Note brackets.) The SD card reader plugs into a standard USB port.
It's equivalent to swapping two std. flash drives in one USB port and
works the same at home (both a SCSI drive & a USB drive present) and at
school (just USB). First drive seen always works. Second(swapped in)
drive always fails. Haven't played around with it as much at school, but
get basically the same results when using my flash drive & a borrowed
drive.
I shouldn't have mentioned the SD card. Don't bother going there. If the
SD card/reader combo is seen first it works fine. The issue is swapping
two (or more) USB flash memory drives in & out of a single connection point.
BTW, having trouble getting one student's Memorex flash drive to work at
all. (Other students' flash drives are OK.)
-mj-
>
> The plug/unplug statements, in my normal use, would apply to the USB
> connection. I think you are applying them to insert/remove of the card
> into/from the reader. I am assuming that you are not plugging and
> unplugging in the USB connection but are inserting and removing the flash
> memory cards.
>
> This being the case, the multiple LU issue is not your problem.
>
> Suppose you do a clean boot, and then you reverse the sequence using
> "flash drive" B first. Does the flash card A then fail to mount but the B
> mounts the second time? In other words, does the same card always fail to
> mount or does in not matter?
>
> Is the 128MB MicroAdvantage as secure digital card or MMC? An SD card has
> the write protect switch on the sice, An MMC card does not.
>
> I am sorry for all the questions. I just want to make sure I give the
> best advice I can.
>
> Alan
>
>
>
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