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

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Clone Drive Using Linux DD Command: Send IMG Over SSH Connection

I SSH to a VPN running Ubuntu Linux. To make backup copies of the hard drive, I use the following dd command: sudo dd if=/dev/sda1 of=/home/rick/hdImage-20150704.img It works, however, is there a ...
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dd an image, but only getting a fraction of the space on my SD card

I downloaded an image of Ubuntu Linaro. I then dd the image onto an SD card that is 32GB as follows: sudo dd bs=4M if=ubuntu-14.04-hdmi-z7010-20140611.img of=/dev/mmcblk0 Works fine, I can boot ...
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35 views

DD command running for over 17 hours on external 1.5TB drive

I used dd with nohup to erase a 1.5TB disk and now I can't get feedback from the progress.. Since it's been more than 17 hours I am worried... I ran the command with the disk unmounted. The disk is ...
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39 views

Is it possible to protect disk image, in format of dd, with bitlocker

I have some files on disk image. This image is in dd format. Now I want to protect that disk with bitlocker. How do I do this? I have tried mounting this image to windows with OSFMount tool, FTK ...
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70 views

dd from /dev/zero to /dev/sda does not overwrite the whole disk

I issued dd command to zero out my hard disk. The command completed successfully but only part of the hard drive was overwritten: mint@mint ~ $ sudo dd if=/dev/zero of=/dev/sda dd: writing to ...
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94 views

What does dd do that pv doesn't?

I see examples online all the time of using dd in combination with pv to show progress... But, something I don't understand is that pv is perfectly capable of doing the task entirely on it's own. So, ...
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35 views

Cloning HDD sector-by-sector (dd/ddrescue), how to skip bad blocks in the middle?

I've got a HDD with unrecoverable bad blocks. HDD is part of Raid-0 array. If I access bad blocks by any means HDD hangs. Let's assume the HDD full capacity is 500,000,000,000 bytes, bad blocks are in ...
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36 views

dd writing on USB flash drive causes massive reads

I am currently restoring a usb stick with a dd image, I have previously created. However is noticed very poor write speed around ~7 MB/s although the stick is usually much faster. After looking ...
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35 views

Incorrect size of image file made with dd and gzip?

In the past I made a backup of a partially full partition with dd if=/dev/sda1 | gzip -5 > file.gz. Some time later, when a free space on partition was smaller I made an image file again with the ...
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61 views

512B to 4KiB (Advanced Format) HDD cloning with dd

What is the best practice to clone with a dd an existing 512-bytes-per-sector HDD (whole disk, not specific partitions) to a modern 4-kibibytes-per-sector Advanced Format drive? What options should be ...
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39 views

Use dd to backup device over the network

I have a Raspberry Pi connected to the network along with a USB stick. Is it possible to use the dd command on my Raspberry Pi and automatically upload the iso to my Mac? What I mean is on my pi ...
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65 views

0M error writing file: 5 access is denied

I'm trying to write ISO on USB using dd command: dd if=evolution-64bit.iso od=\\.\f: bs=4M. I've launched cmd as Administrator, disabled my MSE anti-virus software, but it keeps telling me that Access ...
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1answer
87 views

Head on very large files

I have 2 very big files (27G and 40G), which are output of dd command on a failing hard drive. I wanted to compare the first bytes to see if the 27G bytes is the begining/substring of the 40G. I ...
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69 views

bash script how to parse outputs

I am writing a script to test read/write performance on the network storage, but i need a bit of help to finish the script. The script is simple: reloads the nfs mount to clear the cache ...
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2answers
112 views

Faster recovery from a disk with bad sectors

Recently I tried to dd from an unhealthy HDD to a file. I used dd if=/dev/sdb of=somefile bs=4096 conv=noerror,sync. My problem was that dd wasted a lot of time when it encountered a bad block. In my ...
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36 views

ddrescue failing with very large errsize (hundreds of terabytes)

I'm trying to rip a CD-ROM to an ISO file. I prefer an ISO file to a DMG or CDR file because of cross-platform compatibility. I tried using ddrescue, but no matter what options I use I get the ...
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1answer
112 views

Clonezilla stopped. Can “sgdisk -z /dev/sdx” destroy all the data on sda?

I need suggestions. I wanted to backup sda2 on which Win7 is installed. I deleted the Recovery Resion. (Probably Testdisk can restore this partition because I haven't done any manipulation on that ...
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78 views

Can't boot from USB on MacBook Pro Retina

I downloaded the latest i386 netinst iso for Debian Jessie and have followed these instructions: http://www.ubuntu.com/download/desktop/create-a-usb-stick-on-mac-osx However, when I press alt/option ...
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1answer
25 views

Copying data from file into a specific location of another file with dd truncates the output file

I have a loopback file that contains a single filesystem, let's call it fs.image. I have another, much larger loopback file, that contains multiple partitions and multiple filesystems, let's call it ...
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78 views

Can I use dd to upgrade 1-bay synology NAS to bigger HD?

I have a 1-bay Synology NAS (DS112). According to the Synology compatibility list it can take a 6TB disk. If possible I'd like to clone my existing 2TB disk to the 6TB disk using dd or any other tool ...
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1answer
39 views

dd cannot write the last 24 kB of a disk

I have an old 320 GB laptop hard drive that I'm getting ready to sell (or donate). To prepare it, I'm using dd to write one pass of random data, then one pass of zeros: dd if=/dev/urandom of=/dev/sdb ...
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23 views

How to use losetup to emulate an optical drive that can be a recording target?

On a Linux system, I am intending to convert some audio files (mp3) and write them to an audio CD. Instead of directly writing to an optical disk, I would prefer to somehow redirect the output to an ...
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46 views

How to dd or use something like WinDiskImager to copy a hybrid disk image to a thumb drive?

So this started as a question on how to get a file visible in Windows but invisible in Mac and vice verse: Is it possible to have a file hidden in Windows, but visible in OS X? I was suggested to try ...
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57 views

Last partition fails to dd copy

I'm trying to copy the NOOBS Raspbian distribution's 8GB SD card to a new card. For some reason, the logical partition /dev/sdb6 will not copy correctly. Accessing fdisk /dev/sdb after the attempted ...
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156 views

Test USB 3.0 Device Speed

I've looked up hdparm, but all examples are for testing disks. Not sure if it can be used to test external usb devices (specifically usb flash stick). I'm using the following code right now: dd ...
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25 views

How can I allow users to write an image to a SD Card via dd?

With dd if=myimage of=/dev/sdb root can write an image to an SD card. How can I allow users to do this?
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36 views

dd fails in postgres backup from one server to another

I've got a server which is running out of space. Unfortunately it doesn't even have enough space anymore to backup a postgres database I've got running on it. So I now want to backup the running ...
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112 views

Can not mount copy of image file (ddrescue): “can't have a partition outside the disk”

I'm struggling for days now moving my old Windows XP installation to a new hard disk, because the old disk is failing. Long story short: I successfully created an image of the entire (failing) disk ...
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1answer
32 views

Linux command to look at other drives/partitions on computer from live CD

So my friend’s computer crashed because the file system is corrupted. However, she needs files from the system, therefore, a reinstall wouldn’t do the trick as we still a way to recover the files. ...
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126 views

dd , pv , gzip and exclude directory, possible?

Is it possible to do the following: dd if=/dev/hdx | pv | gzip > /path/to/image.img\ --exclude=/temp --exclude=/lost+found --exclude=/proc --exclude=/path/to/image.img So I want to make a backup ...
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402 views

Why does 'dd' produce different files for same USB stick?

I've just saved the restore for Windows 8.1 onto a USB stick; now, I've been creating the low level copy of it on my HDD, by executing the following command: sudo dd if=/dev/sdf ...
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69 views

Copy huge file skipping first line using dd in Linux

I was trying to copy the content of a huge file (10GB) to another skipping the first line (as in head -n1). I tried multiple ways of head, tail, awk and sed. Settled on using tail -n+2 > ./xab.1 ...
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Cannot mount western digital hard drive. Can I clone it?

I have a 1TB Western Digital USB3 external hard drive. Last day I dropped it and after that I was unable to mount it. The hard drive doesn't have a SATA connector but the circuit board translate from ...
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27 views

ddrescue - trimming failed blocks is reading the target drive

7 8 64 20 1 0| 13M 0 :6728k 0 :6732k 0 | 264B 344B> 3 8 68 19 1 0| 14M 0 :6940k 0 :6940k 0 | 264B 344B> 7 8 61 23 1 0| 13M 460k:6592k 0 ...
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1answer
175 views

How to clone a bootable SD card to a little smaller card?

I have an 8G bootable SD card used for Raspberry Pi. Currently I bought an exactly same card, in order to clone the card. I have tried the following steps: Create an image from the old card: ...
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1answer
96 views

Make disk image with real-time compression over network on Linux

I have two Linux notebooks on a network and no additional storage. I want to backup the first notebook hard drive (make full HDD image), on the second notebook. How could I do that using real-time ...
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26 views

Is dd's extended size notation ignored when bs=<value> is set?

On linux the man page for dd claims: N and BYTES may be followed by the following multiplicative suffixes: c=1, w=2, b=512, kB=1000, K=1024, MB=1000*1000, etc up to M, GB, T, P, E, Z, Y. But ...
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Using gnu dd_rescue to rescue data from a failed hard disk

I'm using gnu ddrescue 1.18.1 from the SystemRescueCD Linux distribution. I started the recovery process yesterday using this tutorial: ...
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canot restore disk image with dd (target part filled with zero)

I have a RAID0 disk before, now I want change the size of it. From the manual, the only way is backup data, delete RAID, re-create with new size, and restore data. now I have many old 2.5" hdd, each ...
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95 views

How to append data in a file by dd?

I want to append new data in a file stored in SSD. dd if=/dev/shm/test of=/data/sdb/test bs=1G oflag=append But df -h shows the dd command always overwrite the test file, instead appends new data ...
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59 views

Will Steam not run if its partition is copied to another using dd?

If I have Steam installed on one windows partition and then I copy that windows partition into another partition using dd, will Steam not run in that new partition? If so is there a way to fix it?
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166 views

How to write bootable iso to a partition?

I want to install a new operating system. Neither want to write the installer ISO to DVD, nor to USB flash drive but to a partition on the HDD itself. I have done it before: I created a bootable USB ...
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1answer
61 views

Does dd require CAP_SYS_RAWIO?

A little while ago, I found out from this that there used to be a way to semi-permanently disable the ability of even root to modify immutable & append-only flags (lcap CAP_LINUX_IMMUTABLE) or ...
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351 views

Making a VDI image bootable for VirtualBox

I created a disk image of a Ubuntu (12.04) system by using dd if=/dev/sda6 of=xxx.img The VDI image was created by using vboxmanage clonehd xxx.img xxx.vdi --format VDI When I create a new VM ...
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windows equivalent for dd

I need to read and write various flash card images. The way i always did this in linux was with dd, and that did the trick. What is a good windows equivalent? Simply put, i need to be able to read an ...
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58 views

Can dd copy raw data from hard drives when operating system cannot recognize file system of partitions of hard disks?

As the title says, can dd copy down from hard disks even when operating system cannot recognize file system of partitions of hard disks?
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Understanding the dd command in Linux

can someone explain to me what this command does: dd if=/dev/zero of=10MBfile1 count=10000 bs=1024 which produces this output: 10000+0 records in 10000+0 records out 10240000 bytes (10 MB) copied, ...
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52 views

How can I identify and read only free-space junk data from EXT4 partition?

I have cloned an EXT4 partition via raw dd command from a Galaxy Nexus phone. How can I identify and read only free-space junk data from the EXT4 partition? I need to recover some WAVE samples(I'm ...
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58 views

Is it possible to clone previous boot disk to new imsm raid array?

A PC with a hard drive 750GB. The hard drive has one partition with Vista and several partitions with Ubuntu 14.04. I mainly work with Ubuntu but occasionaly I boot Vista. Recently, the drive's smart ...
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557 views

Complete wiping of hard drive - shred, wipe or dd?

I need to wipe all data of a number of hard drives, from Ubuntu Linux. I have found three command line tools: shred, wipe and dd. It seems kind of random what people recommend. Sometimes someone ...