Uno SmartMedia USB card reader: plugged in but SCSI device does not appear.

Uno SmartMedia USB card reader: plugged in but SCSI device does not appear.

Post by Adam » Wed, 21 Aug 2002 18:07:03



On Mandrake 8.2, I've plugged in a Uno OmniFlash SmartMedia card reader. It
shows up as an attached device here:

/mnt $ cat /proc/scsi/scsi
Attached devices:
Host: scsi0 Channel: 00 Id: 00 Lun: 00
  Vendor: LITE-ON  Model: LTR-24102B       Rev: 5S57
  Type:   CD-ROM                           ANSI SCSI revision: 02
Host: scsi1 Channel: 00 Id: 00 Lun: 00
  Vendor: OEI-USB  Model: SmartMedia       Rev: 1.00
  Type:   Direct-Access                    ANSI SCSI revision: 02

but the corresponding /dev/sc* does not appear:

/mnt $ l /dev/scd0
lr-xr-xr-x    1 root     root           31 Aug 19 08:34 /dev/scd0 ->
scsi/host0/bus0/target0/lun0/cd
/mnt $ lar /dev/scsi/
/dev/scsi/:
total 0
drwxr-xr-x    1 root     root            0 Jan  1  1970 host0/
drwxr-xr-x    1 root     root            0 Jan  1  1970 host1/

/dev/scsi/host0:
total 0
drwxr-xr-x    1 root     root            0 Jan  1  1970 bus0/

/dev/scsi/host0/bus0:
total 0
drwxr-xr-x    1 root     root            0 Jan  1  1970 target0/

/dev/scsi/host0/bus0/target0:
total 0
drwxr-xr-x    1 root     root            0 Jan  1  1970 lun0/

/dev/scsi/host0/bus0/target0/lun0:
total 0
brw-rw----    1 adam     cdwriter  11,   0 Jan  1  1970 cd

/dev/scsi/host1:
total 0
drwxr-xr-x    1 root     root            0 Jan  1  1970 bus0/

/dev/scsi/host1/bus0:
total 0
drwxr-xr-x    1 root     root            0 Jan  1  1970 target0/

/dev/scsi/host1/bus0/target0:
total 0
drwxr-xr-x    1 root     root            0 Jan  1  1970 lun0/

/dev/scsi/host1/bus0/target0/lun0:
total 0

How do I make /dev/scd1 appear so I can put it in /etc/fstab and mount it?

Thanks,
Adam

 
 
 

1. How to Unmount and Remove UNO SmartMedia card reader

I got this unit because it was recommended as Linux friendly. I'm
running Red Hat 7.2, kernel 2.4.7-10. I've been using this USB card
reader for months but now I  wonder if I'm hot-swapping correctly.
When I plug the USB cable into the reader a red LED lights dimly. After
a few seconds the computer recognizes that it's there and the LED
momentarily
goes out, then lights up even brighter than before.  I then mount the
reader using the normal KDE method (right click on desktop icon and
choose mount). Then I can read/write to it.

The question comes when I unmount and remove the reader. Under Windoze
the remove utility somehow causes the LED to go out before I unplug the
reader from the USB cable. Using Linux, I unmount the reader but the LED

stays lit. I have been removing the reader with the LED lit and have had

occasional data corruption and had to reformat. This hasn't been a
serious problem but I do notice that the floppy drive and the hard drive

LEDs go wacky for a while when I unplug the reader after unmounting it.
Plus, I get quite a delay and lots of wierd SCSI related messages when I

power down the computer. I'm wondering if that is due to the reader
somehow not being fully disconnected by just unmounting it. Does
unmounting suffice to remove a unit from the USB bus or does something
else have to be done? (hope this is clear) I tried finding a USB FAQ but

nothing seems to cover this issue.

Thanks,
Mike

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