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I have a Lexar Media card reader, and when I plug into into the USB slot nothing happens and it's not visible from Konqueror. I'm assuming I have to mount ...
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  1. #1
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    Lexar USB Card Reader Problem


    I have a Lexar Media card reader, and when I plug into into the USB slot nothing happens and it's not visible from Konqueror. I'm assuming I have to mount it somehow, but how? I "googled" it and someone said that USB devices appear under SDAx. Well my last partition is SDA13, and when I plug in the reader there are no new devices appearing above that number in /dev.

    Any suggestions?

  2. #2
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    When you plug in the device, the kernel will detect it and put messages about it in the log. Use the "dmesg" command to see them.

    From my own log:

    [17182420.600000] usb 1-1: new full speed USB device using uhci_hcd and address 3
    [17182420.740000] scsi1 : SCSI emulation for USB Mass Storage devices
    [17182420.740000] usb-storage: device found at 3
    [17182420.740000] usb-storage: waiting for device to settle before scanning
    [17182425.744000] Vendor: Generic Model: STORAGE DEVICE Rev: 0.01
    [17182425.744000] Type: Direct-Access ANSI SCSI revision: 00
    [17182425.748000] SCSI device sda: 256513 512-byte hdwr sectors (131 MB)
    [17182425.756000] sda: test WP failed, assume Write Enabled
    [17182425.756000] sda: assuming drive cache: write through
    [17182425.764000] SCSI device sda: 256513 512-byte hdwr sectors (131 MB)
    [17182425.772000] sda: test WP failed, assume Write Enabled
    [17182425.772000] sda: assuming drive cache: write through
    [17182425.772000] sda: sda1
    [17182425.780000] sd 1:0:0:0: Attached scsi removable disk sda
    [17182425.780000] sd 1:0:0:0: Attached scsi generic sg0 type 0
    [17182425.780000] usb-storage: device scan complete
    Shows the device getting detected, claimed by the usb-storage driver and the highlighted part shows the partitions available.

    In this case I'd use

    Code:
    mount /dev/sda1 /mnt/flash
    to mount the partition. You can change the /mnt/flash argument to anything you need to get it mounted in a suitable location.

    Let us know how you get on,

    Chris...
    To be good, you must first be bad. "Newbie" is a rank, not a slight.

  3. #3
    Linux Newbie burntfuse's Avatar
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    If KDE doesn't detect it, I'm guessing it isn't being detected by the kernel, but it's still worth seeing if you can mount it. Another place to check to see if it's recognized is /proc/partitions, which shows the partitions on the different drives in the system (no matter whether they're mounted or not).

    Depending on how your system's set up, you'll probably have to run the mount command kakariko showed you as root (use "su").
    I have sold my soul to the penguin

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  5. #4
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    Well, strangely, when I plugged in the card reader today to try out the "dmesg" command, I noticed dmesg saw the reader. I plugged in a memory card, and it appeared in konqueror. I have no idea why it wouldn't appear the other day, but it seems to be working now.

    Thanks for the help.

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