Linux dd command

Creating an image file with dd command ¹

First, make sure you’ve sufficient disk space to create a image file using dd:

$ df -H

To create 1MB file (1024kb), enter:

$ dd if=/dev/zero of=test.img bs=1024 count=0 seek=1024

You will get an empty files (also known as “sparse file”) of arbitrary size using above syntax. To create 10MB file , enter:

$ dd if=/dev/zero of=test.img bs=1024 count=0 seek=$[1024*10]

To create 100MB file , enter:

$ dd if=/dev/zero of=test.img bs=1024 count=0 seek=$[1024*100]
$ ls -lh test.img

To create 500MB file , enter:

$ dd if=/dev/zero of=test.img bs=1024 count=0 seek=$[1024*500]

To create 1GB, file:

$ dd if=/dev/zero of=1g.img bs=1 count=0 seek=1G