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Thread: Cannot create partition: "Unable to read /dev/sdd"

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  1. #1
    Join Date
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    Ubuntu 10.04 Lucid Lynx

    Cannot create partition: "Unable to read /dev/sdd"

    I connected a new internal HDD to my headless ubuntu server and would like to partition it so I can copy my existing system disk to it (the existing disk is way low on free space and the new disk is larger.)

    The disk shows in /dev/sdd (there is not sdd1 or any partitions showing). Yet the new disk does not show up using fdisk -l and attempts to mount keep referring to fstab.

    Code:
    tom@HouseMedia:/$ mount /dev/sdd
    mount: can't find /dev/sdd in /etc/fstab or /etc/mtab
    tom@HouseMedia:/$ mount /dev/sdd1
    mount: can't find /dev/sdd1 in /etc/fstab or /etc/mtab
    I had previously mounted and partition this drive but after using dd to restore a disk image of my existing system disk, the new disk was still empty. I'm a little lost on what exactly is wrong and would appreciate some help on getting back to square one again!

  2. #2
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    Re: Cannot create partition: "Unable to read /dev/sdd"

    Quote Originally Posted by antiartist View Post
    I connected a new internal HDD to my headless ubuntu server and would like to partition it so I can copy my existing system disk to it (the existing disk is way low on free space and the new disk is larger.)

    The disk shows in /dev/sdd (there is not sdd1 or any partitions showing). Yet the new disk does not show up using fdisk -l and attempts to mount keep referring to fstab.

    Code:
    tom@HouseMedia:/$ mount /dev/sdd
    mount: can't find /dev/sdd in /etc/fstab or /etc/mtab
    tom@HouseMedia:/$ mount /dev/sdd1
    mount: can't find /dev/sdd1 in /etc/fstab or /etc/mtab
    I had previously mounted and partition this drive but after using dd to restore a disk image of my existing system disk, the new disk was still empty. I'm a little lost on what exactly is wrong and would appreciate some help on getting back to square one again!
    You need to partition the new disk (fdisk and mk2fs) before you can mount it. If the disk is larger than 2GB then you will need to use parted (gparted) to partition the disk.

    In any event you mount partitions (sdd1) not disks (sdd).
    -BAB1

  3. #3
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    Re: Cannot create partition: "Unable to read /dev/sdd"

    Quote Originally Posted by bab1 View Post
    You need to partition the new disk (fdisk and mk2fs) before you can mount it. If the disk is larger than 2GB then you will need to use parted (gparted) to partition the disk.

    In any event you mount partitions (sdd1) not disks (sdd).
    Thanks for the clarification about what I'm mounting (partitions, not disks). I get confused

    Using fdisk to create the partitions isn't working...
    Code:
    tom@HouseMedia:~$ sudo fdisk /dev/sdd
    [sudo] password for tom:
    
    Unable to read /dev/sdd
    tom@HouseMedia:~$
    Both disks are less than 2 TB (which is what I assume you meant, not 2 GB).

  4. #4
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    Re: Cannot create partition: "Unable to read /dev/sdd"

    Quote Originally Posted by antiartist View Post
    Thanks for the clarification about what I'm mounting (partitions, not disks). I get confused

    Using fdisk to create the partitions isn't working...
    Code:
    tom@HouseMedia:~$ sudo fdisk /dev/sdd
    [sudo] password for tom:
    
    Unable to read /dev/sdd
    tom@HouseMedia:~$
    Both disks are less than 2 TB (which is what I assume you meant, not 2 GB).
    Yes I meant 2TB.

    Post the output of
    Code:
    sudo fdisk -l
    -BAB1

  5. #5
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    Re: Cannot create partition: "Unable to read /dev/sdd"

    The disk doesn't show in fdisk -l

    Code:
    tom@HouseMedia:~$ sudo fdisk -l
    
    Disk /dev/sda: 10.3 GB, 10254827520 bytes
    255 heads, 63 sectors/track, 1246 cylinders
    Units = cylinders of 16065 * 512 = 8225280 bytes
    Sector size (logical/physical): 512 bytes / 512 bytes
    I/O size (minimum/optimal): 512 bytes / 512 bytes
    Disk identifier: 0x00018313
    
       Device Boot      Start         End      Blocks   Id  System
    /dev/sda1   *           1        1188     9537536   83  Linux
    /dev/sda2            1188        1247      474113    5  Extended
    /dev/sda5            1188        1247      474112   82  Linux swap / Solaris
    
    Disk /dev/sdb: 320.1 GB, 320072933376 bytes
    255 heads, 63 sectors/track, 38913 cylinders
    Units = cylinders of 16065 * 512 = 8225280 bytes
    Sector size (logical/physical): 512 bytes / 512 bytes
    I/O size (minimum/optimal): 512 bytes / 512 bytes
    Disk identifier: 0x0005f5c2
    
       Device Boot      Start         End      Blocks   Id  System
    /dev/sdb1               1       38913   312568641    7  HPFS/NTFS
    
    Disk /dev/sdc: 1500.3 GB, 1500301910016 bytes
    255 heads, 63 sectors/track, 182401 cylinders
    Units = cylinders of 16065 * 512 = 8225280 bytes
    Sector size (logical/physical): 512 bytes / 512 bytes
    I/O size (minimum/optimal): 512 bytes / 512 bytes
    Disk identifier: 0x3e6caab7
    
       Device Boot      Start         End      Blocks   Id  System
    /dev/sdc1               1      182401  1465136001    7  HPFS/NTFS
    tom@HouseMedia:~$

  6. #6
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    Re: Cannot create partition: "Unable to read /dev/sdd"

    Quote Originally Posted by antiartist View Post
    The disk doesn't show in fdisk -l

    Code:
    tom@HouseMedia:~$ sudo fdisk -l
    
    Disk /dev/sda: 10.3 GB, 10254827520 bytes
    255 heads, 63 sectors/track, 1246 cylinders
    Units = cylinders of 16065 * 512 = 8225280 bytes
    Sector size (logical/physical): 512 bytes / 512 bytes
    I/O size (minimum/optimal): 512 bytes / 512 bytes
    Disk identifier: 0x00018313
    
       Device Boot      Start         End      Blocks   Id  System
    /dev/sda1   *           1        1188     9537536   83  Linux
    /dev/sda2            1188        1247      474113    5  Extended
    /dev/sda5            1188        1247      474112   82  Linux swap / Solaris
    
    Disk /dev/sdb: 320.1 GB, 320072933376 bytes
    255 heads, 63 sectors/track, 38913 cylinders
    Units = cylinders of 16065 * 512 = 8225280 bytes
    Sector size (logical/physical): 512 bytes / 512 bytes
    I/O size (minimum/optimal): 512 bytes / 512 bytes
    Disk identifier: 0x0005f5c2
    
       Device Boot      Start         End      Blocks   Id  System
    /dev/sdb1               1       38913   312568641    7  HPFS/NTFS
    
    Disk /dev/sdc: 1500.3 GB, 1500301910016 bytes
    255 heads, 63 sectors/track, 182401 cylinders
    Units = cylinders of 16065 * 512 = 8225280 bytes
    Sector size (logical/physical): 512 bytes / 512 bytes
    I/O size (minimum/optimal): 512 bytes / 512 bytes
    Disk identifier: 0x3e6caab7
    
       Device Boot      Start         End      Blocks   Id  System
    /dev/sdc1               1      182401  1465136001    7  HPFS/NTFS
    tom@HouseMedia:~$
    If it can't see it it can't partition it. How is the HDD attached (internal, USB or eSATA)? If it is USB then what do you get with
    Code:
    lsusb
    Edit: What do you get if with this
    Code:
    sudo lshw
    -BAB1

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