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

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Copy ISO installation disk to /dev/sda using dd and install?

I would like to install system using sequence of commadns like this: run ubuntu livecd system cd /tmp wget http://ftp.vectranet.pl/opensuse/distribution/13.1/iso/openSUSE-13.1-DVD-x86_64.iso dd ...
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0answers
12 views

dd and gparted and Lubuntu disks all acting funky

So I am trying to write some iso images over to an 8 GB USB drive and this happens. The first iso didn't seem to actually write and when I went to boot it in my other box, it booted to a unetbootin ...
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0answers
11 views

Make Windows boot after sector-wise copying from 4 GB flash card to 8 GB

I've Windows Embedded XP system installed on a 4 GB Compact Flash card (which is visible as IDE drive to operating system). I've used dd to move it sector-to-sector to another flash drive which is 8 ...
0
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1answer
29 views

Hard drive checking by using of dd and md5sum tools

I bought new external USB 3.0 hard drive WD Elements 2 TB and decided to check it by using dd, head and md5sum tools. First I zeroed all hard drive: root@yurko-laptop:/home/yurko-laptop# dd ...
1
vote
1answer
28 views

What's the difference between dd's command options bs=1024 count=1 and bs=1 count=1024

Consider the following two commands both creating a dumb 1KB file dd if=/dev/urandom of=test.file bs=1024 count=1 dd if=/dev/urandom of=test.file bs=1 count=1024 The first command uses a block ...
2
votes
1answer
20 views

Is there a way to output the status of dd (on OS X) during the copy process?

I am using dd to copy iso images to a thumb drive. Is there a way to output the status of dd during the copy process?
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3answers
113 views

Creating a large file of random bytes quickly

I want to create a large file ~10G filled with zeros and random values. I have tried using: dd if=/dev/urandom of=10Gfile bs=5G count=10 it creates a file of about 2Gb and exits with a exit status ...
2
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0answers
105 views

msys-1.0's dd on windows

msys-1.0 (MinGW) has an implementation of dd usable on windows (dd.exe) but windows does not have file representations of drives to use with dd. Or does it? Afaik dd operates on files. Is there a way ...
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2answers
1k views

Use `dd` linux program to save / recover a disk's MBR

I have an Ubuntu OS installed on my laptop. I want to install Windows 7 as well to another disk partition (I will do it by recovering it from a special partition on my laptop). After installing ...
0
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1answer
34 views

Can I pause dd writing, remove the medium, mount it again and continue without causing I/O error?

I'm creating a compressed image of a laptop's internal drive into an external USB disk using a LiveCD GNU/Linux system. Also I use pv to monitor the progress. Here's how the command looks like: dd ...
0
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1answer
37 views

how to make a correct bootable usb of a linux distro?

well I have been installing different distros of linux from by usb from time to time. And I always followed same method which until today stopped working for me. So I use to format my usb with ...
0
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2answers
81 views

What happens if I write to a device other than a disk?

I know, I can write to a hard disk just using dd command in Linux, such as dd if=/dev/zero of=/dev/sdb. Since, every device is represented as file in Linux, I wonder what might happen if I ...
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0answers
45 views

cannot boot kali usb

I downloaded - from http://www.kali.org/downloads/ - Kali Linux 32 bit ISO and then sha1sum-ed. blkid shows my usb on /dev/sdc1 then dd if=<path-to-kali.iso> of=/dev/sdc (I have also ...
6
votes
1answer
2k views

Compressing a file in place - does “gzip -c file | dd of=file” really work?

In the question How can I compress a file on Linux in-place, without using additional disk space?, one answer proposes to simply use gzip -c file | dd of=file I tried it (on Debian Linux), and it ...
6
votes
1answer
235 views

Is it possible to 'instantly' create arbitrary files?

I've seen the following trick to create large, empty files somewhat quickly: dd if=/dev/zero of=test.dat bs=1024 count=1024 However, this still takes some time when creating multi-GB files. I ...
12
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3answers
11k views

How to pad a file with “FF” using dd?

How to pad a file with 0xFF using dd? This command will pad the output file with zeroes until the file size reaches 100 KB: dd if=inputFile.bin ibs=1k count=100 of=paddedFile.bin conv=sync ...
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7answers
3k views

How can I recover a crashed hard drive?

My hard drive from my MacBook crashed and died hard last week. I replaced the drive with a new one, and installed 10.6/Snow Leopard on it. The old drive is now in a usb enclosure, and I really need to ...
2
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1answer
40 views

DDRescue - Did I do the wrong command which is causing it to take longer then expected

I am running the following command on a 500GB drive: ddrescue --force --direct /dev/sde2 /home/backups/sde2.img sde2_logfile.ddrescue However, the time has been almost 24hrs and all it has done so ...
2
votes
1answer
50 views

Hex of filesize

I am following a tutorial on few kernel dev. I encountered an operation where I have to use dd like dd ... if=PBL.bin of=... count=block_number The block_number variable is defined to be as The ...
19
votes
4answers
21k views

How can I find what /dev my DVD-drive is?

I'm on Mac OS X, have a DVD in the DVD-drive and can look at it in the Finder. I'd like to try to create an iso of it by using the dd command. But to do that I need to know what device to use as an ...
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2answers
104 views

changing permissions of Read-only file system in linux

i use this command to make a bootable flash disk of linux mint sudo dd if=~/Desktop/linuxmint.iso of=/dev/sdx oflag=direct bs=1048576 it's work, but now my flash disk is lock and i can't change ...
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4answers
4k views

How to output file from the specified offset, but not “dd bs=1 skip=N”?

How to do thing like dd if=somefile bs=1 skip=1337 count=31337000, but efficiently, not using not 1-byte reads and writes? The solution is expected: To be simple (for non-simple I can write some ...
4
votes
2answers
1k views

faster dd backup by differential copy

im looking to use dd to back up my whole hard drive regularly but it takes around 1.5 hours and want to know if there is a faster way to back up. possibly just by updating the bytes which are ...
1
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1answer
28 views

Will copying to an identically sized disk cause issues if the output disk has bad sectors?

I just made a copy from one 160gb disk to another, identical 160gb disk, using the command sudo dd if=/dev/sda of=/dev/sdb (run on a live Ubuntu CD) However, the SMART test on /dev/sdb shows 20 ...
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2answers
1k views

Is it possible to mount a disk image, created with dd, to a directory on a mounted external usb hdd?

I have an image of my home (/dev/sda3) partition, which I've created using the "dd" command. dd if=/dev/sda3 of=/path/to/disk.img I've deleted the home partition via gparted in order to enlarge my ...
50
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2answers
2k views

Why is piping 'dd' through gzip so much faster than a direct copy?

I wanted to backup a path from a computer in my network to another computer in the same network over a 100 Mbit/s line. For this I did dd if=/local/path ...
0
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1answer
20 views

Creating a data rescue partition

I am trying to recover deleted files from a Windows HDD (320 Gb) with multiple partitions. Have three questions: Will dd if=/dev/sdb of=~/image_sdb.img bs=4096 create an image of all partitions ...
6
votes
1answer
3k views

dd_rescue vs dcfldd vs dd

What are the main differences between dd_rescue, dcfldd, and dd? In what situations would you use one over the other? Why are there three different yet simliar programs?
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2answers
43 views

Does `dd` work on physical level or on filesystem level?

When you delete a file from a device, let's say an USB stick, then (without doing any further stuff) only the entry in the filesystem is deleted, the raw bytes of this file are still on the device ...
2
votes
2answers
87 views

Move partition data with dd to the right

I need some help to get a dd command line that is moving my partition blockwise to the right. I stumbled upon an error when using tools to image some pcs and now I need to repartiition those machines ...
1
vote
1answer
45 views

How can I backup the entire file system on a backup image file?

I am pretty new to Linux. I am configuring my RaspBerry that use RaspBian (that is a minimalistic Debian distribution). Before changing some settings I want to have a backup of my entire system in ...
0
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0answers
38 views

How to chroot into memory disk so that hard disk can be unmounted?

What I want to achieve is to be able to backup my hard disk over ssh like the following without the need to boot from a live CD / rescue media: dd if=/dev/sda | gzip -1 - | ssh user@hostname dd ...
4
votes
1answer
685 views

Can you successfully clone a Mac OS X boot volume directly to another larger volume with ddrescue?

Can you clone a Mac OS X boot volume (specifically a "Mac OS Extended, Journaled" a.k.a. JHFS+ volume) directly to another, larger volume using ddrescue or even dd, and have the target volume end up ...
0
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0answers
21 views

Restoring backup with dd

I have made a backup of an hard drive using ddrescue. Now I have the .img file. How can I restore the .img Backup to an other hard drive? I have tried dd if=backup.img of=/dev/sdc but the hdd sdc is ...
3
votes
4answers
4k views

Windows XP virtual machine hangs in VirtualBox

What i want to do: I'm trying to virtualise 2 different physical Windows XP systems which reside on one hard drive each to VirtualBox under Windows 7. What I did (once per drive): From a Linux ...
0
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2answers
85 views

Can dd be used to copy an SSD with an OS?

The OS in question is Windows 8.1 Both laptops have 100+ gig SSDs Now suppose I really don't want to bother installing the OS again, can I just use a linux USB stick, dd the whole SSD drive to ...
1
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5answers
713 views

Is it a very bad idea to create disk image of mounted disk?

I would like to backup my server. For example using dd: dd if=/dev/md0 of=/some_network_share I wonder if this image will be vary inconsistent if /dev/md0 is mounted? Would it be possible to ...
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votes
2answers
40 views

How to unpack dd file on Windows?

Is it possible to unpack files created with linux dd tool on Windows? I have tried that tool http://www.chrysocome.net/dd, but it crashes under Windows 7. Any ideas?
0
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1answer
44 views

Windows Hard Drive swap [duplicate]

I am going to be moving a HDD from one computer to another identical one. Can I just switch out the hard drives, or will I have to dd the old one onto the one that is already in there?
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votes
1answer
38 views

Can dd achieve better bandwidth/speeds on a USB 3.0 bus? [closed]

As the title says--I recently acquired a USB 3 stick that I'll mostly be using for moving ISOs/images around between computers. With the increased transfer rate of USB3, can I deviate from my habitual ...
1
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0answers
42 views

dd destroyed my partition. how do I recover the data? [duplicate]

I used the command dd if=/dev/mmcblok0 of=/dev/sda2 to backup my sd card of my raspberry pi (where /dev/mmcblok0 is my sd card and /dev/sda2 is the second partition on my external hdd) ...
0
votes
3answers
24 views

dd to a Hitachi HDD

Is it safe to perform a dd if=/dev/zero of=/dev/sda bs=512k to an 80GB Hitachi HDD via a bootable linux cd? and format it with a new file system? I hope that won't cause me any problems later, the ...
0
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2answers
35 views

Restoring a disk image with dd

I made an image of a complete disk with : $ sudo dd if=/dev/sdc | gzip -c > my_image.dd.gz When I restore it with : $ gunzip -c my_image.dd.gz | sudo dd of=/dev/sdc I get errors when I type : ...
2
votes
1answer
174 views

cleanup after “dd” operation

I'm using dd with "excl" option. If interrupted with CTRL+C "dd" leaves the the file it has created and not finished to write. I need to clean it up in such case with the trap INT. However, I don't ...
0
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0answers
14 views

Moving a part of a file with dd

How do I do a memmove for a file on linux? Specifically, will dd work in the following case, when if and of are the same? dd if=test_file of=test_file bs=512 seek=10 skip=0
0
votes
1answer
48 views

dd immidiately completes but actually needs sync

I use dd to copy an iso to a USB drive. I have a SSD so it reads it very fast however I have a USB 2.0 drive, which is at most 480 Mbps but it says it copied with 404 MB/s, which is impossible. I need ...
5
votes
1answer
371 views

File recovery: How can I make a non-destructive copy of a (NTFS) partition?

I want to recover some deleted files from a healthy NTFS partition on an undamaged hard-disk. In order to leave the partition undisturbed, i plan to use dd to clone the partition to a raw image file ...
3
votes
1answer
224 views

Two 2TB drives, why is dd is almost 8 times faster erasing one?

I have two 2TB drives: /dev/sde WCD WD20EZRX-00D8PB0 Firmware revision 80.00A80 (new consumer-grade WD Green series) /dev/sdf WCD WD2002FYPS-01U1B1 Firmware revision 04.05G05 (old pro-grade server ...
0
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2answers
208 views

Any way to make partitioning tools see kpartx-created devices?

I have a dd'ed disk image file with me. I can use a tool like kpartx to create a device-mapper device from this disk image file. But partitioning programs like gparted and fdisk don't list my ...
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2answers
79 views

Does dd stop when the disk is full?

If I issue the following command to completely erase a disk, will it automatically stop when the disk is full, or do I need to specify the count option?: sudo dd if=/dev/zero of=/dev/disk7 bs=64m I ...