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Full Discussion: Using dd to copy a partition.
Special Forums Hardware Filesystems, Disks and Memory Using dd to copy a partition. Post 302530160 by newyorkpaulie on Monday 13th of June 2011 06:28:09 AM
Old 06-13-2011
Using dd to copy a partition.
Here's a conundrum. I use a ThinkPad (T30) which has a slot on the side for the hard drive. It is very easy to swap this with another hard drive which I keep as a backup. Now when I copy the Linux partition from my (in use) hard drive to the backup one (in my UltraBay slot) it takes only 30 minutes. If instead I copy this partition to my storage drive (in my docking station's drive slot) and save it as a file, the same copying takes 2 and a half hours. How come so much longer? Any thoughts?
From the hard drive to the backup I use this:
Code:
dd if=/dev/sda6 of=/dev/sdb6

From the hard drive to a storage drive I use:
Code:
dd if=/dev/sda6 of=/media/160GB/sda6file

Note that the file size is 18.0GB and the partition size is 28.6GB.
Last edited by pludi; 06-13-2011 at 09:32 AM.. Reason: Additional information added.
 

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LEARN ABOUT MINIX

repartit

REPARTITION(8)						      System Manager's Manual						    REPARTITION(8)

NAME

       repartition - load a partition table

SYNOPSIS

       repartition device [partition-file]

DESCRIPTION

       Repartition  uploads  a new partition table for the partitions of device.  The table is obtained from the first sector of partition-file if
       given, device otherwise.  Device may refer to the whole drive or a primary partition, depending on whether you want to upload  a  partition
       or a subpartition table.  The partitions will be truncated to fit within the enclosing device like the disk driver does, unless the numbers
       are coming from partition-file.

EXAMPLES

       repartition /dev/hd0
       repartition /dev/hd4 /etc/hd4.table

       Reload the partition table of drive 0 setting /dev/hd[1-4], and the subpartition table of /dev/hd4 setting /dev/hd4[a-d] using a file.  The
       latter may be useful if you need more than the 4 subpartitions a single Minix partition gives you.

DIAGNOSTICS

       The new table is printed on standard output.

FILES

       /dev/hd[0-9]

SEE ALSO

       hd(4), part(8).

BUGS

       The disk must be in use for the changes to stick.  The partition table of an idle disk will be reloaded on the first open.

AUTHOR

       Kees J. Bot (kjb@cs.vu.nl)

																    REPARTITION(8)
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