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Thread: Clone drive using dd results in unformatted drive..???

  1. #1
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    Clone drive using dd results in unformatted drive..???

    I'm wanting to copy my entire Natty install from /dev/sda to the new disk - /dev/sdc and be able to boot into it.

    Yesterday I added a 3 TB USB drive to my system and proceeded to erase the useless software that comes on the drive (Seagate Go Flex), formatted as ext3, then clone a 2 TB internal SATA drive using clonezilla.

    This failed so I then tried the dd command (dd if=/dev/sda of=/dev/sdc) as root.

    The operation completed after several hours, with no errors and claimed it had copied 2 TB of data to the new disk, so I tried to boot it. The message said something like - insert disk or bootable media..."

    What was supposed to happen according to a guide I found, was after the copy was made I was supposed to go into gparted to expand the size of the partition (since I was cloning a smaller drive to a larger one) but gparted reports the entire drive as 'unformatted', and also as being 2.7 TB (100+ GB - 1% reserved for root, since I first formatted as ext3).

    The system no longer sees the drive in file manager but is recognized by fdisk, and BIOS (under the cdrom drives section).

    fdisk -lu reports:
    Disk /dev/sdc: 3000.6 GB, 3000592977920 bytes
    255 heads, 63 sectors/track, 45600 cylinders, total 732566645 sectors
    Units = sectors of 1 * 4096 = 4096 bytes
    Sector size (logical/physical): 4096 bytes / 4096 bytes
    I/O size (minimum/optimal): 4096 bytes / 4096 bytes
    Disk identifier: 0x000d1faa

    Device Boot Start End Blocks Id System
    /dev/sdc1 * 2048 59375615 237494272 83 Linux
    /dev/sdc2 59377662 3907028991 2505703432 5 Extended
    Partition 2 does not start on physical sector boundary.

    fdisk /dev/sdc1 returns:

    "Note: sector size is 4096 (not 512)
    Device contains neither a valid DOS partition table, nor Sun, SGI or OSF disklabel
    Building a new DOS disklabel with disk identifier 0xd01e4e29.
    Changes will remain in memory only, until you decide to write them.
    After that, of course, the previous content won't be recoverable.

    Warning: invalid flag 0x0000 of partition table 4 will be corrected by w(rite)

    WARNING: DOS-compatible mode is deprecated. It's strongly recommended to
    switch off the mode (command 'c') and change display units to
    sectors (command 'u').
    "

    Googling on 'invalid flag' I found this http://ubuntuforums.org/showthread.php?t=1192598 on sfdisk but I'm unsure that this is the actual problem.

    sfdisk -l reports:
    Disk /dev/sdc: 364801 cylinders, 255 heads, 63 sectors/track
    Warning: extended partition does not start at a cylinder boundary.
    DOS and Linux will interpret the contents differently.
    Units = cylinders of 8225280 bytes, blocks of 1024 bytes, counting from 0

    Device Boot Start End #cyls #blocks Id System
    /dev/sdc1 * 0+ 3695- 3696- 29686784 83 Linux
    /dev/sdc2 3696+ 243201- 239506- 1923825665 5 Extended
    /dev/sdc3 0 - 0 0 0 Empty
    /dev/sdc4 0 - 0 0 0 Empty
    /dev/sdc5 10504+ 243201- 232698- 1869139968 83 Linux
    /dev/sdc6 3696+ 3817- 122- 975872 82 Linux swap / Solaris
    /dev/sdc7 3817+ 10504- 6687- 53707776 83 Linux

    The drive I attempted to clone is sda - sfdisk says:

    Disk /dev/sda: 243201 cylinders, 255 heads, 63 sectors/track
    Warning: extended partition does not start at a cylinder boundary.
    DOS and Linux will interpret the contents differently.
    Units = cylinders of 8225280 bytes, blocks of 1024 bytes, counting from 0

    Device Boot Start End #cyls #blocks Id System
    /dev/sda1 * 0+ 3695- 3696- 29686784 83 Linux
    /dev/sda2 3696+ 243201- 239506- 1923825665 5 Extended
    /dev/sda3 0 - 0 0 0 Empty
    /dev/sda4 0 - 0 0 0 Empty
    /dev/sda5 10504+ 243201- 232698- 1869139968 83 Linux
    /dev/sda6 3696+ 3817- 122- 975872 82 Linux swap / Solaris
    /dev/sda7 3817+ 10504- 6687- 53707776 83 Linux

    Ubuntu's disk utility shows:

    and:


    With all this:
    "Partition 2 does not start on a physical sector boundary"
    and:
    "Warning: invalid flag 0x0000 of partition table 4 will be corrected by w(rite)" and Note: sector size is 4096 (not 512)"
    and:
    "Device contains neither a valid DOS partition table, nor Sun, SGI or OSF disklabel
    Building a new DOS disklabel with disk identifier 0xd01e4e29.
    Changes will remain in memory only, until you decide to write them.
    After that, of course, the previous content won't be recoverable."

    ... I'm unsure what the next step would be if this is even recoverable at all.
    Can someone see what the problem might be?

    Thanks
    Mr. M
    Last edited by meanmrmustard; March 1st, 2012 at 02:04 PM. Reason: remove redundant info

  2. #2
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    Re: Clone drive using dd results in unformatted drive..???

    It is normally better to just clone partitions with the dd command. However you must have created as large or larger partitions on the new drive before doing so.

    Clone partition table. Warning! It will erase whatever partition table is already on /dev/sdc:
    Code:
    sfdisk -d /dev/sda | sfdisk /dev/sdc
    Copy partition 1:
    Code:
    dd if=/dev/sda1 of=/dev/sdc1 bs=1M conv=noerror
    Do the last step over for each partition.
    Last edited by HavarN; March 1st, 2012 at 03:08 PM.

  3. #3
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    Re: Clone drive using dd results in unformatted drive..???

    Quote Originally Posted by HavarN View Post
    It is normally better to just clone partitions with the dd command. However you must have created as large or larger partitions on the new drive before doing so.

    Clone partition table. Warning! It will erase whatever partition table is already on /dev/sdc:
    Code:
    sfdisk -d /dev/sda | sfdisk /dev/sdc

    Copy partition 1:
    Code:
    dd if=/dev/sda1 of=/dev/sdc1 bs=1M conv=noerror
    Do the last step over for each partition.
    Thanks!
    I suppose if I knew how to write a script I could get all partitions copied while I'm away from the machine?

  4. #4
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    Re: Clone drive using dd results in unformatted drive..???

    I do not fully understand the new 4k drives. Some try to work as 512.

    MBR drives have a max of 2.2TiB or 2TB, drives over 2TB need to be formated with gpt. Not sure how 4K drives change that, but if it is tring to be seen as 512sectors then it will not work in MBR. If 4K then it is not the same as a 512 drive.

    First, understand that most partitioning tools have moved to a policy of aligning partitions on 1 MiB (2048-sector) boundaries as a way of improving performance with some types of RAID arrays and some types of new hard disks (those with 4096-byte physical sectors). See article by srs5694:
    http://www.ibm.com/developerworks/li...-sector-disks/
    Post on 8-sector boundaries alignment by srs5694
    http://ubuntuforums.org/showthread.php?t=1685666
    http://ubuntuforums.org/showthread.php?t=1768635
    http://ubuntuforums.org/showthread.php?t=1635018
    srs's to show 8 sector alignment
    $ sudo parted /dev/sda unit s print

    GPT fdisk Tutorial -srs5694 in forums
    http://ubuntuforums.org/showthread.php?t=1439794

    Do not use dd with gpt partitions.
    For more info on UEFI boot install & repair - Regularly Updated :
    http://ubuntuforums.org/showthread.php?t=2147295
    Please use Thread Tools above first post to change to [Solved] when/if answered completely.

  5. #5
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    Re: Clone drive using dd results in unformatted drive..???

    Lots of great info there, thank you Oldfred.
    I've decided to install Oneiric on the new drive for now and I plan to get back to the cloning a bit later after I digest all the links.
    I'll be sure to come back here and post results.
    Thanks again!
    Last edited by meanmrmustard; March 1st, 2012 at 08:47 PM.

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