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  1. #1

    USB External Drive - Recognize but nothing more

    I have External USB drive plugged in.

    I get looking at var log messages I see:

    Sep 3 05:24:35 localhost kernel: [345843.640240] scsi12 : usb-storage
    Sep 3 07:06:12 localhost kernel: [351937.639484] scsi13 : usb-storage

    I also see:
    Bus 01 Device 06: ID 0d49:7300 Maxtor (this is a maxtor external drive)

    fdisk -l doesn't show it though. Can't post results due to it thinks it's an url

    It doesn't show me an SDC, etc. So how do I mount the drive that isn't visible all the way

  2. #2
    fdisk -l shows you the partitions on your devices. But if your device does not have any partition it therefore should not be shown by fdisk -l. Take a look at /dev
    ls /dev
    then plug in your USB drive and run ls /dev again. You should see a new device (mostly /dev/sd[c,d,e,f,g] or something like that). That's your device you can open with fdisk for partitioning.

    If that's not the case and your USB drive has partitions the maybe file system support for your USB stick is not enabled in your Kernel.

  3. #3
    I ran ls /dev and here is what I have.

    cdrom loop4 ptmx sdb2 tty12 tty28 tty43 tty59 vcs3
    cdrom-sr0 loop5 pts sdb3 tty13 tty29 tty44 tty6 vcs4
    console loop6 ram sdb5 tty14 tty3 tty45 tty60 vcs5
    core loop7 ram0 sg0 tty15 tty30 tty46 tty61 vcs6
    disk MAKEDEV ram1 sg1 tty16 tty31 tty47 tty62 vcsa
    fd mcelog ramdisk sg2 tty17 tty32 tty48 tty63 vcsa1
    full mem random shm tty18 tty33 tty49 tty7 vcsa2
    fuse net root sr0 tty19 tty34 tty5 tty8 vcsa3
    initctl null rtc stderr tty2 tty35 tty50 tty9 vcsa4
    input nvram scd0 stdin tty20 tty36 tty51 ttyS0 vcsa5
    ipmi0 parport0 sda stdout tty21 tty37 tty52 ttyS1 vcsa6
    kmsg parport1 sda1 systty tty22 tty38 tty53 ttyS2 vmkcall
    log parport2 sda2 tty tty23 tty39 tty54 ttyS3 vmkcnx
    loop0 parport3 sda3 tty0 tty24 tty4 tty55 urandom X0R
    loop1 port sda5 tty1 tty25 tty40 tty56 vcs zero
    loop2 ppp sdb tty10 tty26 tty41 tty57 vcs1
    loop3 psaux sdb1 tty11 tty27 tty42 tty58 vcs2

    All of the SDA and SDB stuff is hard drives. The sg0, sg1, sg2 say that it is not a block device.

    Ran the command with and without USB drive plugged in and didn't see a difference.

    But it shows as a USB drive when I do lsusb.

  4. $spacer_open
  5. #4
    Please don't post the raw output of ls /dev, that's hardly readable.
    sgX is for your optical drives like CD-ROM, that has nothing to do with your USB drive.
    Just look at:
    ls /dev | grep sd
    You should notice a difference there when plugging in your stick.

  6. #5
    Sorry about that.

    I did ls /dev | grep sd

    I then compared that with fdisk-l

    Everything that I grepped was accounted for in fdisk-l as sda and sdb which are both the local drive system.

    Does that make sense?

    I didn't notice any difference when unplugging the usb drive, or plugging it in.

  7. #6
    No other /dev/sdX devices like /dev/sdc when pluggin in the device? It might actually take a while after pluggin in until it shows up in /dev (about 3-15 sec).
    If not your device might need additional drivers.

  8. #7
    SuperMod (Back again) devils casper's Avatar
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    Jun 2006
    Chandigarh, India
    Have you checked the same External Hard disk in any other machine? Does it have any partition or is it a brand new blank Hard disk?
    It is amazing what you can accomplish if you do not care who gets the credit.
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