Questions tagged [dd]

dd is a common Unix program whose primary purpose is the low-level copying and conversion of raw data.

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How to use a `dd if=/dev/sda of=/dev/sdb` drive?

Given: a sudo dd if=/dev/sda of=/dev/sdb duplicate drive of the main boot drive. How does one safely, reliably : mount a dd duplicate drive as a second drive? setup the dd duplicate drive as ...
marc-medley's user avatar
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Cgroup - CPU share doesn't go down

I tried to run a process dd if=/dev/zero of=/dev/null bs=20M Then I got the PID using top. Afterwards, I created a foo directory under /sys/fs/cgroup/cpu/ and edited the following 1) Added 128 to ...
ha9u63a7's user avatar
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"isolinux.bin missing or corrupt" when trying to boot 16.04 from USB

I wiped my USB drive using GParted and then installed the Ubuntu 16.04 ISO to the drive using Disks (gnome-disks) by selecting the "Restore Partition Image..." option and then writing the ISO to the ...
d3pd's user avatar
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Ubuntu 16.04 not booting from USB

I tried to create a bootable USB for Ubuntu 16.04. When booting from the USB I only see a black screen with a blinking cursor though. Here are the different attempts I've tried: Download the Ubuntu ....
wasp256's user avatar
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Why do NVME-read-command and dd have different results?

Why do NVME-read-command and dd have different results? sudo dd if=/dev/nvme0n1p1 of=lba.0.dd bs=4096 count=1 results: abcdefaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa.... sudo nvme ...
Hossein's user avatar
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Write cache / delay as long as possible

I am trying to setup Linux to delay the writes as much as possible (minutes). To those wondering why: this is Chia plotting. It is very write intensive done in SSD/NVMe, if the system crashes you have ...
rufo's user avatar
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No bootable device after using dd on the wrong disk: how can I save the data

When creating a Clonezilla live USB, I mistakenly entered the wrong device name in the dd command: sudo dd if=/path/to/clonezilla-iso-file of=/dev/sda status=progress where sda was the laptop's HDD (...
Yannis's user avatar
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Flashing an SD card with the dd command - Problem

I have a weird problem regarding the dd command. I have a wic image which has 4 partitions and which I flash onto an sd card with the following command: sudo dd if=<image.wic> of=/dev/sda bs=1M ...
Larry The Blackbird's user avatar
2 votes
1 answer
2k views

Can not "zero" my drive with dd

I was "zeroing" my drive with the dd tool when I get this input/output error: Is my drive good for trash or is there a way to fix it please? Thanks a lot for your answer :) sudo dd if=/dev/zero of=/...
Frankie's user avatar
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How can I automate the installation of an Ubuntu image using a USB device?

I have to automate the installation of a Linux image. The perfect behavior would be that I plug the USB, turn on the device and it runs the dd command in order to flash the image stored in the USB ...
Gabriel Llorens Valles's user avatar
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DD command broke partition table Ubuntu

I have two exact same model and capacity hard drives with the first one having Ubuntu Server 16.04 (/dev/sda) on it and the second (/dev/sdb) having formerly been part of RAID configuration on ...
astralmaster's user avatar
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cc1: error: code model kernel does not support PIC mode

This is my simple drivers Makefile: obj-m+=hello_world_module.o KDIR=/lib/modules/$(shell uname -r)/build all: make -C $(KDIR) M=$(shell pwd) modules clean: make -C $(KDIR) M=$(shell pwd) ...
Sridhar Sri's user avatar
2 votes
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sha256sum of image on dvd doesn't match to original ISO

I tried to check sha256sum of ISO after it was burn on DVD I used this command and got result that differs from original ISO's check: dd if=/dev/sr0 | sha256sum Does it mean that it was written ...
R S's user avatar
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How do I restructure RAID 10?

We would like to alter the partition without losing data. Here is the sketch of the plan. I am wondering if it is doable using mdadm; and if so, please kindly point some reference on how to carry out ...
user276851's user avatar
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resize2fs: Invalid argument while trying to resize /dev/sda1 (dd problems)

I was attempting to copy my Ubuntu installation to a larger HDD following this guide with the dd command. The guide says: "It's recommended you dd to an identical partition for optimal results." ...
AkBKukU's user avatar
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DD question copying 2 select partions to target

Using ubuntu for few weeks now and its excellent. Really like the dd copy tool but i would like some advice on using it. I copied all my installers to a partitioned ssd i now need to reverse but each ...
wertyu2007's user avatar
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Performance test went wrong and the dd command created 13TB of data on /dev/mapper/device. Why system didn't crash? HDD-250GB

So I wanted to do some performance test with encrypted and normal data storage on my embedded device. That is not what I was expected to see at all! Can you please explain it to me what just happend. ...
What_is_my_name's user avatar
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How to recover an overriten partition?

So I thought I try something fancy today and learn how to use the terminal to install a raspberry pi image on a flash drive. The result was not as I imagined. Apparently I've overwritten my partition ...
Flajt's user avatar
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Shrink down an image file which is made by with the Ubuntu's "Disks" application

So I've made a backup image file from my Ubuntu system with the Disks application. My SSD storage is 180GB which is quite big due to the fact that my system is only 20% of it. So there are a numerous ...
r4nd3l8888's user avatar
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288 views

Why Can't dd Create a Bootable ISO from an Ubuntu VM?

I have an Ubuntu 21.04 guest in VirtualBox, on either Linux or Windows hosts. I can run dd (from that guest or from some other boot in the VM) to create an image of the guest, or to clone it to an ...
Ray Woodcock's user avatar
1 vote
1 answer
854 views

“dd” command copy “.img” file to SD card and remain a free space

I have the 16GB SD card and the 1.5GB .img file. This .img file consist of 2 partition: boot: 2MB sys: ~1.5GB I copy .img to SD card with this command: dd if=*.img of=/dev/sdb bs=4M After above ...
curlywei's user avatar
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How to read a RAID 0 array created in Windows (NTFS)

A customer came in with a corrupt hard drive. We took the hard drive, and cloned the data, via testdisk, onto a raid 0 array. The reason being is that the HDD was 2TB and the largest SSD we had atm ...
Om Khadka's user avatar
1 vote
1 answer
278 views

What happens when the process of zeroing out an hard drive is interrupted?

I was zeroing out my hard drive using the dd command and there was an interruption. What does this mean for the hard drive? If I run the command again, will the zeroing take off from where the ...
Caspian's user avatar
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dd command to clone an SSD to an NVMe

In my windows 10 system, I boot from a 500 GB SSD that has two partitions, both NTFS. I want to clone that to make bootable an internal M.2 NVMe I have installed. At first, I could get it to copy, but ...
Harry Binswanger's user avatar
1 vote
1 answer
147 views

Problem with live iso run as installed

There was an SSD drive with Xubuntu distro installed. If booted, I can see it has one ext4 partition. It worked fine but was planned to be moved to other HDD and to another machine. I run live iso ...
qba-dev's user avatar
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1 vote
2 answers
285 views

Backup uSD card into smallest img/zip file

I want to backup my self-made RPI based mp3-player. There is a 16GB uSD card inside, with only 4GB of data used. When i use dd to copy the whole uSD card as backup, I get a 16GB img file. zipping it ...
user658894's user avatar
1 vote
1 answer
9k views

How do I restore important data for image.dd? Photorec will lose file names and will scatter the information

A few days ago I was in a middle of copying or cutting folders and data to my external hard drive and it was corrupted. I have tried to locate the lost information on Test Disk but I have now lost it ...
LifeIsATest's user avatar
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138 views

How to recover data from NTFS partition after accidently running EXT4 dd on it?

I was trying to copy my EXT4 partition as backup and I accidentally putted my NTFS partition containing my data on the dd command. Now my data is lost :( I've tried testdisk but it wasn't able to ...
HQuser's user avatar
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1 vote
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1k views

Cloning Windows 8.1 with Ubuntu dd

Will there be any problem/caveat when I have a hda disk with Windows 8.1 system and with a bootable flash disk I enter under Ubuntu system this command: dd if=/dev/hda of=/dev/hdb bs=1M
user2925716's user avatar
1 vote
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69 views

Why does dcfldd always fail on cd-roms that also contain music?

Ive been working on digitizing my entire library of physical discs, using dcfldd to make disc image copies of every cd-rom & dvd Ive ever owned so I can take them off to the thrift store and save ...
BruceJohnJennerLawso's user avatar
1 vote
1 answer
4k views

Set date and time from http header in router with curl or wget

This technique should be similar or the same as on Ubuntu; though the following code does not work on the router. One method is the following: dateFromServer=$(curl -v --silent https://google.com/ 2&...
Tyler's user avatar
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1 vote
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69 views

Data remain on hard disk after dd command

After several experiments with Ubuntu mini, I have discovered something strange. When I want to start a new installation, I boot the system to the Ubuntu mini image, I let it continue to the language ...
Stormlord's user avatar
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1 vote
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79 views

Can't mount dd image - shows correct used space

So one of my HD starting to give me Input/Output errors 1.5 weeks ago and I immediately went into 'backup' mode. The drive in question is a 4TB HD and I have created a dd image of it already (took 5 ...
TimLavelle's user avatar
1 vote
0 answers
505 views

Why dd is not working?

I have an SD that is giving me a lot of problems. Data started to get corrupted, specially pictures and now I am trying to wipe it and give it another use. I am still able to see the pictures that ...
Alvaro Bravo's user avatar
1 vote
0 answers
1k views

Recover data from corrupted sd card

My cell phone and computer can't access my SD card anymore which is maybe because of a corrupted block/sector. I tried everything as it contained some useful data i desperately need. It is still ...
Austin's user avatar
  • 111
1 vote
0 answers
349 views

Trying to copy hard drives with dd I get "physical block size is 2048 bytes, but Linux says it is 512"

I am trying to copy (using dd) from one hard drive to another on a network of only two computers (a Ethernet cable between them). The computers are the same model and the hard drives are also the same ...
user272036's user avatar
1 vote
0 answers
90 views

dd Command Becoming Non-Resposive While Writting Floppy Image

I am trying to write a floppy image using dd. I am running this command: dd if=fdboot.img of=/dev/fd0 bs=1024 conv=sync status=progress ; sync (Though I've also tried a simple dd if=fdboot.img of=/...
thunderbird32's user avatar
1 vote
0 answers
121 views

Using remaining space on a startup disk

While using applications like dd, Startup disk creater, etcher I can see that a lot of space on the startup disk is unusable. This is normally equal to the diskspace minus the ISO size. How can this ...
Fazil Abdul Lathif's user avatar
1 vote
0 answers
856 views

Using zenity progress bar with bzcat to dd copy

I know there are ways to add a progress bar to dd, but I can't seem to get anything to work with my specific situation. Here is what I have so far: bzcat /file/path/goes/here.dd.bz2 | pv -n | dd of=/...
Kyle Thompson's user avatar
1 vote
0 answers
135 views

How to backup the first 3 of 5 partitions

I'm figuring out how to backup the first 3 of 5 partitions, in order to be able to restore them in case of disk failure or in case I messed up my system. Partition 4 and 5 are setup in RAID 1 ...
Willem Hexspoor's user avatar
1 vote
0 answers
872 views

Change filesystem blocksize when installing 15.10

so, I'm very much out of my depth in the whole world of *nix here. I'm searching all over about file system block sizes, and I found this script which determines what I can tell are read-speeds with ...
Patrick's user avatar
  • 517
1 vote
0 answers
464 views

How to recovered destroyed partition(dd command)

So I have been using a ubuntu livecd to help backup my windows os that won't start. I used the sudo dd if=dev/sda4 of dev/sdc1 accidentally and OVERWROTE the whole 700gig external hard drive and it ...
Cinzz's user avatar
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1 vote
0 answers
549 views

Making a backup copy of the DVD "Iron Man 2"

I am trying to make a backup copy of my DVD Iron Man 2 (I live in a country where it is OK). This particular DVD has special tricks to prevent buyers from doing that (see dicussion for Mac). I ...
Nicolas Raoul's user avatar
1 vote
0 answers
306 views

Unable to login after dd clone

I have a test system with two 80GB drives: /dev/sda has Windows7 installed on it and /dev/sdb has Ubuntu 14.04. I imaged the Ubuntu drive to a third USB HDD using dd if=/dev/sdb of=/media/...
WhiteWidget's user avatar
1 vote
1 answer
384 views

Restoring backup from dd image has really weird results

I've been using Clonezilla for weekly image backups, which is obviously a little bit of a hassle. I've been trying to switch to dd, so I can have cron run it for me. This is what my backup script ...
Big Millz's user avatar
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1 vote
0 answers
161 views

dd: Trying to recover my file system

ubuntu: 14.04 By mistake I ran the following command dd if=/dev/zero of=/dev/sda2 bs=1024 count=1 and now grub is unable to recognize file system and so the linux is not starting. I think I have ...
paresh bhoi's user avatar
1 vote
1 answer
2k views

Raid10: how to tell which disks are in mirror?

When I do "cat /proc/mdstat", there seems no such information as to tell which disks are in mirror. % cat /proc/mdstat md126 : active raid10 sda1[0] sdd1[3] sdc1[2] sdb1[1] ... near-copies Thanks ...
user276851's user avatar
1 vote
0 answers
205 views

Syncing/Mirroring two partitions (Sata, USB) : RAID or not?

My 12.04 Ubuntu server has a 120Go internal SATA sda5, ext4 partition. I also own a 500 Go USB2 external hard-drive from which I could easily free 120 Go. Now, I've been meaning to set up mirroring (...
Heisennberg's user avatar
1 vote
1 answer
3k views

Why is DD taking so long?

Background: I have an 8-disk Network Attached Storage device. I've been having issues with it where the hard drives fail on a regular basis. I figured out what the problem is with this: firmware ...
Damian T.'s user avatar
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1 vote
0 answers
586 views

How to move ubuntu 12.04 on another drive

How I can move my ubuntu on another drive? I know about clonezilla but problem is that destination drive is smaller the source one. Gparted can't copy-paste partition if destination not the end last ...
Maksim's user avatar
  • 21