Enlarge disk partition image

Source:

• http://sirlagz.net/2012/06/20/how-to-resize-partitions-on-an-image-file/
• http://sirlagz.net/2013/03/04/how-to-resize-partitions-in-an-image-file-part-2/

Create a device for the original image, note the /dev/loop20:

sudo losetup -f --show org_partition.img

	/dev/loop20

Create file of a size you want (here 4500M) check your medium Disk type maximum file size‎

dd bs=1M count=4500 if=/dev/zero of=new_partition.img

Create a device for the image, again, note the new /dev/loop21

sudo losetup -f --show new_partition.img

	/dev/loop21

Copy data from the original image to the empty image, if=source, of=destination (PROCEED WITH CAUTION):

sudo dd if=/dev/loop20 of=/dev/loop21

	7761920+0 records in
	7761920+0 records out
	3974103040 bytes (4,0 GB, 3,7 GiB) copied, 46,4243 s, 85,6 MB/s

Disconnect the devices:

	 
sudo losetup -d /dev/loop20
sudo losetup -d /dev/loop21

Resize the filesystem to available space:

	 
resize2fs -f new_partition.img

  Resizing the filesystem on new_partition.img to 1152000 (4k) blocks.
  The filesystem on new_partition.img is now 1152000 (4k) blocks long.

Check and allow the tool to fix errors:

e2fsck -f new_partition.img
 
 Pass 1: Checking inodes, blocks, and sizes
 Pass 2: Checking directory structure
 Pass 3: Checking directory connectivity
 Pass 4: Checking reference counts
 Pass 5: Checking group summary information
 Block bitmap differences:  -(531654--531655) -(532478--532479) -(857474--858485)
 Fix<y>? yes
 Free blocks count wrong for group #16 (815, counted=819).
 Fix<y>? yes

See also

• Disk type maximum file size‎
• Shrink disk partition image