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dd skip=122880 count=3788799 status=progress if=2013-02-09-wheezy-raspbian.img  of=secondpartition.img

dd skip=122880 count=1832960 status=progress if=2013-02-09-wheezy-raspbian.img  of=secondpartition.img

dd skip={Partation Start} count={number of Blocks} status=progress if={Disk image}  of={Partition output file}

So all you have to do to create an image of a partition or group if partitions is get the number of sectors for the start of the partition or first partition from the output of fdisk and use it as the value of the dd parameter "skip" and then the number of sectors for the End of the partition or last partition and set it as the value for the dd parameter "count".

So all you have to do to create an image of a partition or a group of partitions is to get the number of sectors for the start of the partition or first partition from the output of fdisk and use it as the value of the dd parameter "skip" and then the number of sectors for the End of the partition or last partition and set it as the value for the dd parameter "count".

dd skip=122880 count=3788799 status=progress if=2013-02-09-wheezy-raspbian.img of=secondpartition.img

as it shows in the output of fdisk, fdisk is using 512 bytes as the default block size

dd if=/dev/urandom of=test count=1

The file size should be 512 bytes

so all you have to do to create an image of a partition or group if partitions is get the number of sectors for the start of the partition or first partition from the output of fdisk and use it as the value of the dd parameter "skip" and then the number of sectors for the End of the partition or last partition and set it as the value for the dd parameter "count".

dd skip=122880 count=3788799 status=progress if=2013-02-09-wheezy-raspbian.img  of=secondpartition.img

as it shows in the output of fdisk, fdisk is using 512 bytes as the default block size:

dd if=/dev/urandom of=test count=1

The file size should be 512 bytes.

So all you have to do to create an image of a partition or group if partitions is get the number of sectors for the start of the partition or first partition from the output of fdisk and use it as the value of the dd parameter "skip" and then the number of sectors for the End of the partition or last partition and set it as the value for the dd parameter "count".