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Thread: /dev/sdb1 does not exist

  1. #1
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    /dev/sdb1 does not exist

    My 12.04 Server suddenly doesn't want to mount one of my internal drives. Upon boot it says "The disk drive for /media/hd2 is not ready yet or not present.".

    The strange thing is I can cd into /media/hd2, and I see everything - files and folders. However, ls -l /dev/sdb1 says "no such file or directory".

    My /etc/fstab looks good, but my /etc/mtab doesn't have a line for /dev/sdb1. When I add it manually (every time I boot), df then has an entry for /media/hd2 but /dev/sdb1 still doesn't exist.

    Hints? I'll buy you a six pack...

  2. #2
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    Re: /dev/sdb1 does not exist

    Quote Originally Posted by davidmenges View Post
    My 12.04 Server suddenly doesn't want to mount one of my internal drives. Upon boot it says "The disk drive for /media/hd2 is not ready yet or not present.
    The strange thing is I can cd into /media/hd2, and I see everything - files and folders. However, ls -l /dev/sdb1 says "no such file or directory".

    My /etc/fstab looks good, but my /etc/mtab doesn't have a line for /dev/sdb1. When I add it manually (every time I boot), df then has an entry for /media/hd2 but /dev/sdb1 still doesn't exist.

    Hints? I'll buy you a six pack...
    The files in /dev define the various devices. The partition sda1 is a block device. It holds data in blocks. The command ls will list the device as such
    Code:
    brw-rw---- 1 root disk 8, 1 Jan 16 10:31 /dev/sda1
    Note the b on the far left. This connotes that this is a block device. The user can't see any information like you would see in a directory. See a directory listing here
    Code:
    drwxr-xr-x 2 bab bab 4096 Jan 15 20:29 Desktop
    drwxr-xr-x 5 bab bab 4096 Nov 11 14:20 Documents
    Note the d at the far left. This connotes a directory that holds data the can be seen by the user.

    In short /dev files are for OS interface with devices, not for the user to use directly.
    -BAB1

  3. #3
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    Re: /dev/sdb1 does not exist

    Lets see the output of
    Code:
    sudo blkid -c /dev/null
    sudo fdisk -l
    cat /etc/fstab
    one by one please.
    DISTRO: Xubuntu 12.04-64bit --- Boot-Repair --- Grub2 wiki & Grub2 Basics --- RootSudo

  4. #4
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    Re: /dev/sdb1 does not exist

    it looks like your partition is being mounted with a different part name:
    try
    Code:
    less /etc/mtab | grep "/media/"
    @ajgreeny blkid doean't need sudo:
    Last edited by fdrake; January 17th, 2013 at 04:38 PM.

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  5. #5
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    Re: /dev/sdb1 does not exist

    Quote Originally Posted by fdrake View Post
    @ajgreeny blkid doean't need sudo:
    It does on my system!

    No sudo; no output!
    DISTRO: Xubuntu 12.04-64bit --- Boot-Repair --- Grub2 wiki & Grub2 Basics --- RootSudo

  6. #6
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    Re: /dev/sdb1 does not exist

    first step is to make sure your system can see it and check if its mounted or not

    Code:
    sudo fdisk -l; mount | grep ^'/dev'
    If its there but not mounted edit /etc/fstab
    see here https://help.ubuntu.com/community/Fstab

  7. #7
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    Re: /dev/sdb1 does not exist

    Quote Originally Posted by ajgreeny View Post
    Lets see the output of
    Code:
    sudo blkid -c /dev/null
    sudo fdisk -l
    cat /etc/fstab
    one by one please.
    OK, here goes. I notice /dev/sdb1 is missing from blkid... I don't have data on that drive, so I can reformat - if I thought it would help.

    blkid:

    /dev/sda1: UUID="e48a840e-28f9-4c31-9e66-30fd1aa1696b" TYPE="ext2"
    /dev/sda5: UUID="uMu31h-Vvh6-Nmdi-C0b3-RS1K-JIzG-yb6i8W" TYPE="LVM2_member"
    /dev/sdc1: LABEL="hd3" UUID="c79fbd4f-b8d5-46dd-9b4d-62afa6050a69" TYPE="ext4"
    /dev/sdd1: LABEL="hd4" UUID="57fdc863-d21d-4a07-9fc9-6b674ecb51b2" TYPE="ext4"
    /dev/mapper/davidubu-root: UUID="00508efc-5664-49a9-81f7-718e2315e404" TYPE="ext4"
    /dev/mapper/davidubu-swap_1: UUID="49ac5e7f-3d3e-4f00-84a2-6da3655faeaf" TYPE="swap"

    fdisk:

    Disk /dev/sda: 1000.2 GB, 1000204886016 bytes
    255 heads, 63 sectors/track, 121601 cylinders, total 1953525168 sectors
    Units = sectors of 1 * 512 = 512 bytes
    Sector size (logical/physical): 512 bytes / 512 bytes
    I/O size (minimum/optimal): 512 bytes / 512 bytes
    Disk identifier: 0x000a6565

    Device Boot Start End Blocks Id System
    /dev/sda1 * 2048 499711 248832 83 Linux
    /dev/sda2 501758 1953523711 976510977 5 Extended
    /dev/sda5 501760 1953523711 976510976 8e Linux LVM

    Disk /dev/sdc: 1000.2 GB, 1000204886016 bytes
    255 heads, 63 sectors/track, 121601 cylinders, total 1953525168 sectors
    Units = sectors of 1 * 512 = 512 bytes
    Sector size (logical/physical): 512 bytes / 512 bytes
    I/O size (minimum/optimal): 512 bytes / 512 bytes
    Disk identifier: 0x00000000

    Device Boot Start End Blocks Id System
    /dev/sdc1 1 1953525167 976762583+ ee GPT

    Disk /dev/sdd: 1000.2 GB, 1000204886016 bytes
    255 heads, 63 sectors/track, 121601 cylinders, total 1953525168 sectors
    Units = sectors of 1 * 512 = 512 bytes
    Sector size (logical/physical): 512 bytes / 512 bytes
    I/O size (minimum/optimal): 512 bytes / 512 bytes
    Disk identifier: 0x00000000

    Device Boot Start End Blocks Id System
    /dev/sdd1 1 1953525167 976762583+ ee GPT

    Disk /dev/sdb: 1000.2 GB, 1000203804160 bytes
    255 heads, 63 sectors/track, 121601 cylinders, total 1953523055 sectors
    Units = sectors of 1 * 512 = 512 bytes
    Sector size (logical/physical): 512 bytes / 512 bytes
    I/O size (minimum/optimal): 512 bytes / 512 bytes
    Disk identifier: 0x00000000

    Device Boot Start End Blocks Id System
    /dev/sdb1 1 1953525167 976762583+ ee GPT

    Disk /dev/mapper/davidubu-root: 995.6 GB, 995606134784 bytes
    255 heads, 63 sectors/track, 121042 cylinders, total 1944543232 sectors
    Units = sectors of 1 * 512 = 512 bytes
    Sector size (logical/physical): 512 bytes / 512 bytes
    I/O size (minimum/optimal): 512 bytes / 512 bytes
    Disk identifier: 0x00000000


    Disk /dev/mapper/davidubu-swap_1: 4290 MB, 4290772992 bytes
    255 heads, 63 sectors/track, 521 cylinders, total 8380416 sectors
    Units = sectors of 1 * 512 = 512 bytes
    Sector size (logical/physical): 512 bytes / 512 bytes
    I/O size (minimum/optimal): 512 bytes / 512 bytes
    Disk identifier: 0x00000000

    fstab:

    # /etc/fstab: static file system information.
    #
    # Use 'blkid' to print the universally unique identifier for a
    # device; this may be used with UUID= as a more robust way to name devices
    # that works even if disks are added and removed. See fstab(5).
    #
    # <file system> <mount point> <type> <options> <dump> <pass>
    proc /proc proc nodev,noexec,nosuid 0 0
    /dev/mapper/davidubu-root / ext4 errors=remount-ro 0 1
    # /boot was on /dev/sda1 during installation
    UUID=e48a840e-28f9-4c31-9e66-30fd1aa1696b /boot ext2 defaults 0 2
    /dev/mapper/davidubu-swap_1 none swap sw 0 0
    /dev/fd0 /media/floppy0 auto rw,user,noauto,exec,utf8 0 0

    # Added by David C. Menges 2012-10-24
    /dev/sdb1 /media/hd2 ext4 defaults 0 0
    /dev/sdc1 /media/hd3 ext4 defaults 0 0
    /dev/sdd1 /media/hd4 ext4 defaults 0 0

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