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 decrease dd output size via defragmenting and zero fill empty space

I want to make backups of a whole hdd using dd, unfortunately backup sizes matter I use the following commands to ensure compression and splitting (fat32 habit, since you cant save anything more than ...
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109 views

Manually installing an ISO onto a USB?

I'm trying to install TAILS. I've downloaded and verified it and everything and I'm on to installing it. I want to install it manually onto a USB stick. The TAILS website doesn't have any instructions ...
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2answers
56 views

Preventing the dd command on extra drives

I use dd a lot day to day for writing Raspberry Pi SD card images. However every now and then I slip and by accident dd the wrong partition and thus killing my other drives. I was wondering if ...
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DD command to copy broken drive HELP! [closed]

I want to copy the data of a broken hard drive to an other. Arrive to the conclusion: dd if=/dev/disk2 of=/dev/disk3 bs=4k conv=notrunc, noerror but here is the answer: dd: unknown conversion ...
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2answers
27 views

How to find card reader block device?

I am trying to make an image from USB Card Reader using dd. When I connect device, this is what the log tells me: Aug 21 11:26:50 acid kernel: [ 1399.579168] usb 1-1: New USB device found, ...
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22 views

Do I have to unmount the drive when using dd command?

I have a 60 GB SSD where my Ubuntu installation and home folder is and a 1 TB HDD that I used to use as storage device (movies, music..). I have decided to sell the 1 TB drive but before I do that I ...
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51 views

dd: failed to open ‘kali-linux-1.1.0a-amd64.iso’: No such file or directory

I'm trying to create a Kali Bootable USB Drive on Ubuntu 14.04 LTS following these instructions -> http://docs.kali.org/downloading/kali-linux-live-usb-install Everything seemed alright till the ...
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45 views

Mount raw disk image

I want to mount all partition of a dd image in actually partition to my Ubuntu I want to it like same as a actual disk /dev/sdx , /dev/sdx1 , /dev/sdx2 & etc. I try to mount image with: ...
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2answers
16 views

How does dd write to a device node when you usually can't?

Now usually you'll have a partition on your USB drive or whatever, and you can only write things to there. But dd has the ability to write things outside of partitions, presumably in the MBR. How does ...
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59 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 ...
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1answer
89 views

Permission denied for “dd” of Android phone's file system connected over mtpfs in Ubunutu 14.0.4

I have connected my rooted Mi3 android phone to Ubuntu 14.0.4 using jmtpfs. I am using ~/Desktop/phone as my mount point. I am able to browse the Android device using Nautilus. Now I want to recover ...
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12 views

Write to a non-existant device using dd

Hello I wanted to write an iso image to an USB stick (which is in /dev/sdd) but I've made a slight typo, instead of typing: dd if=/path/to/downloaded.iso of=/dev/sdd I typed: dd ...
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18 views

dd if=/dev/sdX of=image conv=notrunc,noerror,synv copies only a fraction of disk

I tried imaging my bootable usb stick, to free it for other data. However running sudo dd if=/dev/sdc of=windows7 bs=512 conv=notrunc,noerror,sync copies only 1.1GB for a 8 GB (7.7GibiByte) stick. ...
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5answers
5k views

What does the command name “dd” stand for?

I'm using dd to copy an image onto a USB. But what does dd stand for? I understand its use, but not what the name dd actually means, or is an acronym for. It doesn't even say in the man page.
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82 views

Does dd or shred do any harm to the physical media of a hard disk?

Does dd or shred commands only overwrite the data and the filesystem or do they change or modify the physical media of the hard disk? Because I know that I can format a hard disk millions of times ...
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111 views

Cannot format read-only USB; 'Error calling fsync(2) on /dev/sdb: Input/output error ' when I try to format the drive

I'm trying to format this USB, when I plug it in it mounts and I can read what's on it, but can't write to it or delete anything (read-only error). First I tried the normal 'Disk utility' - unmount - ...
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3answers
191 views

SD Card Slot doesn't work

Alternative way to earn the bounty: Show me how to store a file system like ext4 (a FS which can store large files, I don't really need all of the good stuff ext4 provides for this use case) in many ...
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28 views

I ran “dd if=file1” on accident and gibberish started flowing - Bad?

I ran "dd if=correctfilelocation" on accident before I was able to add in the second half of the command and gibberish text in terminal started going crazy. Did I break anything? The file was an OS I ...
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634 views

Create Random non words [closed]

dd if=/dev/urandom of=a.log bs=1M count=2 Question: if this code ^ gives me random numbers, how can I get random non-words (unintelligible) such as “hgcqw”. Question 2: Can the shuf command be ...
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1answer
47 views

Cloning SSD with dd But Clone Does Not Boot

At my job we have always used dd to make clones of our master os image, but recently we have updated from Ubuntu 12.04 to 14.04. We made an image of it and created a news SSD with it. sudo dd ...
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2answers
115 views

Can't erase everything (partition/data) on sdcard, even with dd

I have a Kingston sdcard (16g) with partition and data written on it. here is the output of root@victor-ss9:/home/victor# fdisk -l /dev/sdf Disk /dev/sdf: 15.6 GB, 15560867840 bytes 4 heads, 16 ...
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53 views

Create exact copy of compact flash with encryption with dd

I have a touchscreen system that's using some sort of encryption on a compact flash card to run it's OS. The card died, but I have access to identical machines. But when I try to copy the cf with DD ...
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23 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 ...
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101 views

DD doesn't seem to work in Ubuntu 15.04

I have used the dd command for a while to add my bootloader to a floppy image created with mkdosfs. mkdosfs -C disk_images/aquaos.flp 1440 dd status=noxfer conv=notrunc ...
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30 views

thumb drive went in to read only mode, no idea why?

It's almost brand new, suddenly sudo dd if=/dev/zero of=/dev/sdd bs=512 count=1 dd: failed to open ‘/dev/sdd’: Read-only file system tried with sudo hdparm -r0 /dev/sdd /dev/sdd: setting ...
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1answer
554 views

Error, even with sudo: “dd: failed to open ‘/dev/sda1’: Permission denied” (dd input piped from gzip)

My command which doesn't work: sudo gzip -dc sda1.image.gz | dd of=/dev/sda1 returns the following error even before I've had a chance to enter my password: dd: failed to open ‘/dev/sda1’: ...
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1answer
165 views

Problem with DD & Startup disk creator

I want to create a bootable USB drive for Chromium OS. I downloaded this image (direct link) and I want to put it on my 4 Gb USB. The IMG file is 2.6 Gb and my USB is 4 Gb, so there is space for the ...
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1answer
52 views

What is the best way to clone a disk?

My guess is that dd if=/dev/sda of=/dev/sdb bs=4096 will work out well for me. I have some concerns though: What is the ideal bs size? Is it advisable to use a live cd? I simply don't want to ...
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1answer
89 views

Creating an SD disk image from scratch: “you must specify a filesystem type”

The really short version: I am trying to create a disk image that includes an MBR/bootloader provided in another image, and one partition with a root filesystem provided in a tarball. Creating the ...
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55 views

Using dd to test Write speeds

I'm trying to check the write speed of different devices that I have using the following: dd bs=1M count=256 if=/dev/zero of=/path/to/device oflag=dsync I want an accurate reading of write speed ...
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41 views

How to copy directories and files from a corrupted harddrive?

I have an I/O error every time I copy folders and files from a partition to a backup harddrive . So how can I safely backup this data to my backup HDD?
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Complete I/O error HDD after doing dd

Ok, before reading this, I just want to say that this is not a duplicate post. I once owned a Seagate Momentus Thin 500GB that contains Windows 8. After messing up a bit, it restarted and what I saw ...
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36 views

System hangs after being restored from dd backup

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 ...
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37 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 ...
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46 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 ...
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2answers
171 views

USB drive doesn't auto mount

I was trying to create a live USB on my Ubuntu 14.04 system using the 'dd' command. After this operation, on inserting the USB stick, the device does not mount automatically as it used to get before. ...
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1answer
83 views

Copying files from hard drive to external hard drive, GPT Partition got in the way

I am trying to copy files off my laptop to an external hard drive because Windows is corrupt, and I need to reinstall it. I was going to use dd, but when I start the process ...
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2answers
403 views

GPT PMBR size mismatch after dd clone

I am migrating my Ubuntu EFI boot system to a larger hdd. I used the command dd if=/dev/sdb of=/dev/sda I did not dismount the inputfile before copying and the outputfile was fresh unpartitioned ...
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64 views

How to convert a file to a block device?

When I backup a partition with: dd if=/dev/sda2 of=~/sda2 bs=512 I can still mount it using mount ~/sda2 /mnt But what if I backup the whole disk? dd if=/dev/sda of=~/sda bs=512 I can't just ...
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40 views

Copy system to new fresh install

I want to wipe my entire hard drive and install a fresh dual-boot Windows7/Ubuntu system, but want to put the entire Ubuntu system as it is now back onto it. The install is located at /dev/sda10. I ...
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2answers
174 views

Is there a faster way to only occupy disk space than dd [duplicate]

In order to test that our systems correctly detect that they are running out of space, we just need large files on the disk where we do not care about their content at all. At the moment we use dd ...
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2answers
334 views

GZip of drive image created by using `dd` command

I created yesterday a drive image using GZip. I opened the 51.3 GiB file named ssd.img.gz to see one icon thats a package of 3.9 GiB, yes, thats THree point Nine Gigabytes in size and has the name of ...
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1answer
138 views

How do i avoid starting dd over again after a system freeze?

Some days ago I decided to wipe my 750 GB hard disk in order to sell it, so I booted Ubuntu off a live DVD and started the process with sudo dd if=/dev/zero of=/dev/sda. I left dd running during the ...
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123 views

Disk image, partitions selectively, all this using dd [closed]

Start point situation: HDD with MBR scheme, four primary partitions, one of them is Windows XP system and boot partition. Remaining partitions are used for plain user data files. This formatting was ...
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182 views

How can I archive dd's output directly possibly without using any compression?

It has been determined already in this question that tar cannot read input from stdin. How else can a dd output be archived directly possibly without using any compression? The purpose of doing ...
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2answers
75 views

cloning several hardrives using the dd command

I'm developing a software to clone one hard-drive onto several other. I want to clone the content to up to 23 drives at once using dd to clone the partition from the source to the targets using sudo ...
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487 views

How to use the dd command to copy an .img file to an SD card?

I've been trying to use the dd command to send an .img file of mine to a partition on my SD card. The command is: dd if=/dev/sda6/media/david/desktop/stellar-unbrick.img of=/dev/sdb1 Unfortunately, ...
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295 views

Can not unlock from and lock to Launcher

I just use dd -ip /dev/sda -op /dev/sdb to clone my old disk to new disk, and boot from my new disk. All the things remain the same except that applications in Launcher changed back to default. Why? ...
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102 views

How do I DD backup the Microsoft Surface onto a Image file? Has anyone done this and restored it successfully?

I normally back up my PCs with a disk dump. Its effective but slow, but required for us. I usually do something like this: dd if=/dev/sda bs=512k of=/mnt/MyUsbStick4TB/BackupOfMyCDrive_sda.dd Can ...
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83 views

Harddrive replication without *full* dump (dumping partitions is OK)

Today, I bought a second server almost identical to my first one (I guess). Specs (processor model, RAM, HDD) are the same. But I failed to copy the disk of the first one to the second one. It didn't ...