How To Use The DD Command in Linux

The dd command in Linux is a utility for copying and converting files and has many practical uses. In this video we go over a few of the most important ones.
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Commands used in this video
Wipe a drive
dd if=/dev/urandom of=/dev/sdb bs=1M conv=noerror
for n in `seq 7`; do dd if=/dev/urandom of=/dev/sdb bs=1M conv=notrunc,noerror; done
Backing up and restoring an entire disk or a partition
dd if=/dev/sdb of=/dev/sdc bs=1M conv=noerror
Creating a compressed disk image
dd if=/dev/sdb | gzip -c {right angle bracket} /tmp/testdisk.img.gz
dd if=/dev/sdb | gzip -c - | ssh user@local dd of=image.gz
gzip -dc /tmp/testdisk.img.gz | dd of=/dev/sdb
Create a bootable USB Drive
dd if=~/Downloads/linuxmint-20-xfce-64bit.iso of=/dev/sdb bs=1M
File carving
dd if=/dev/shm/test.txt of=/dev/shm/test2.txt skip=5 bs=1
dd if=/dev/shm/test.txt of=/dev/shm/test2.txt skip=5 bs=1 count=8

[@greenfinch628]

Your video really demystified DD for me. Thank you.

[@youssef.0exe]

loved the explanation, liked and subscribed

[@boy23techy65]

Thank You: dd with gzip is what i was looking for.

[@HutS-e5c]

at 3:29 what does "do not truncate the output" mean? Also, I see that you address the drive or the partition through the dev directory. Can you access the drive or the partition through its mounting point instead? At 6:00 Why did you use "-" after gzip -c ? When I create a bootable USB drive using an iso file (I used Ubuntu server iso), I get a read-only USB. I mean, my USB drive is 64GB but I end up with a closed 2GB USB (the 2GB are filled with the new operating system files) with no ability to use the extra space as storage. Is there a way to make a bootable USB and in the same time I still can write on the unused empty space on the USB (like what I get if I use Rufus software on windows)?

[@marioandresheviacavieres1923]

Thank you :)

[@sussusamogus7831]

great video thank you

[@eforever27]

that was super nice video about dd Thank you!

[@fadiallo1]

Best

[@Sam-vf5uc]

If I were to do this to the boot drive (say, a SATA HDD to a SATA SSD), assuming I have enough space, would the drive used as the output file also be boot-able in the same machine?

[@opalcitrine]

Yes

[@jim7smith]

Excellent, you earned a like and a sub

[@dkell1597]

How do i delete a partioned ssd?

[@arturopresa6552]

Why I have this error? dd if=/dev/sdb of=/dev/sdc bs=1M conv=noerror dd: failed to open '/dev/sdc': Permission denied

[@powerpc64]

sudo !!

[@vanderwilhelm667]

Im kinda late but use sudo

[@Nicnackity]

excellent

[@yos2413]

thanks

[@anshumankanungo4181]

I have got queries to ask on these 2 command operations, 1. IN, dd if=/dev/sdb | gzip -c - | ssh user@local dd of=image.gz Q1>THE COMPRESSED BACKUP FILE IS CREATED WHERE?ON CLIENT OR SERVER? 2.IN , gzip -dc /tmp/testdisk.img.gz | dd of=/dev/sdb Q2>THE img.dz FILE WILL BE DECOMPRESSED AND ALL THE FILES IN THEIR ORIGINAL STATE WILL BE CREATED IN /dev/sdb or THE SAME COMPRESSED FILES WILL BE CREATED IN /dev/sdb?????

[@securerandom5420]

Anshuman, 1. The file is being compressed on the client where you execute the command and then being sent to the remote server where it is being written to the image.gz file. 2. The file is being decompressed and piped into the DD command as its input, it's then being written directly onto the /dev/sdb device. Once this is complete all the files will be decompressed and in their original state on the /dev/sdb device. Let me know if this answers your question

[@anshumankanungo4181]

@@securerandom5420 Thanks for explaining. But still have a query i.e. what will be the location of image.gz file in this command : dd if=/dev/sdb | gzip -c - | ssh user@local dd of=image.gz or i mean to ask where is this file located? On the remote server or my client(my linux pc)?

[@securerandom5420]

@@anshumankanungo4181 It will be located on the remote server. Specifically, it will be located at /home/user/image.gz.

[@anshumankanungo4181]

@@securerandom5420 Thank you for explaining and clearing my doubt😀

[@H-RutherfordHill]

"sue-due"

[@vittiw3737]

V

[@danielgx83]

thanks