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

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11
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1answer
9k views

Why do we use cp to copy files and not dd? (in unix-derivatives)

For normal file copying in *nix, I've only ever seen people use cp (eg. cp /mnt/mydevice/myfile ~/myfile), but I eventually ran into dd, which appears to do the exact same thing (dd ...
1
vote
1answer
663 views

Restoring a split image created by dcfldd

Say an image is generated by dcfldd using the following command: dcfldd if=/dev/sourcedrive hash=md5,sha256 hashwindow=10G md5log=md5.txt \ sha256log=sha256.txthashconv=after bs=512 conv=noerror,sync ...
0
votes
1answer
1k views

dd restore image to HDD (having issues)

I had made a complete image (at least I think I have) using dd if=/dev/sda of=/mnt/sda.img bs=32M where mnt is an external HD I use. I came to restore that image this morning, so I booted up on a ...
0
votes
1answer
166 views

How to do a 1:1 copy of a Windows HD [duplicate]

I have a Windows 7 installation on a separate HDD, since installing Windows takes at least half a day on my machine do to the fact that I have to install a big list of drivers, I would like to do an ...
0
votes
2answers
1k views

Can dd be used to make an exact disk image(copy) of HDD and SSD?

So I want to take a disk image of my SSD/HDD, but I want my disk image to be exactly the same as every bits/information of my physical hard disk. (so that if there are files deleted but recoverable ...
0
votes
1answer
80 views

Fedora restored from cloned image has broken image

Ive had the following issue. Yesterday Ive dd-ed a HDD with fedora 18 which was split in 3 parts: fedoras sda1 which was ext4, sda2 which was the LVM and sda3 which was ntfs storage partition. Ive ...
4
votes
1answer
206 views

Why is my 500GB hdd not readable after dd'ed on a different 500GB hdd?

Accidentally formatted an important external 500GB hdd yesterday. Not an SDD, 2.5". (Quick) formatting occured while installing windows xp on it. I had the wrong usb drive plugged in. ~600MB are ...
2
votes
1answer
418 views

Consequences of zeroing out a partition with dd

I have a partition called sdb1 formatted as ext4. The partition is currently mounted. If I do the following: dd if=/dev/zero of=/dev/sdb1 What are the consequences (beyond all data on the being ...
25
votes
2answers
69k views

creating a bootable USB from command line on linux

I have a CD that's created from an ISO file which I use to install a custom version of Ubuntu via plop linux. The cd works fine but I'd like to use a bootable USB drive instead. I used the command dd ...
4
votes
2answers
166 views

Attempting to test an embedded nand flash chip by filling up a file to drive capacity

I'm trying to test an embedded nand flash chip using the dd command (write random data to a file): dd if=/dev/urandom of=/nand/storage/testnand/test.raw bs=100000 count=50 2> /dev/null However, ...
4
votes
1answer
128 views

What is the difference between byte sizes for DD

If I use the extreme byte size of 1 gb vs 1 mb for instance, on the hardware level, what is the difference? What does a byte size do if a constant stream of data is just getting written to the disk>?
1
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3answers
1k views

How do I image a 128GB drive to a 120GB one using Linux dd?

I have 2 SSD's. My system (Ubuntu 12.04) is installed on one and I want to clone it to another. The problem is that the system is currently on a 128GB drive and the new one is only 120GB. Is it ...
10
votes
6answers
1k views

What happens if I dd zeros to the drive where dd resides?

Will this command: dd if=/dev/zero of=/dev/sda bs=1M succeed if the dd command was originally on /dev/sda? Will this complete because dd is in memory at that time?
0
votes
2answers
533 views

Why does dd copy slower with really small and really big block sizes?

I have realized that if I use really small block sizes, the dd copy is slower, but if I use really big block sizes, it also is slow. I have found that 1M is optimum. Why is this?
1
vote
0answers
556 views

Clonezilla Disk too Small when it isn't

I took a 320 gig hard drive, shrunk the partition for Windows to 40 gigabytes, and cloned the partition. I'm trying to restore onto a 250 gig drive. I keep getting either a failed partition table, or ...
13
votes
6answers
10k views

How to use Cygwin to copy an image from an SD memory card

Long story short, I'm working on a Windows 7 machine and I'd like to strip the image off an SD card (backing up the card from a Raspberry Pi). I'm trying to use Cygwin, but not having much success. ...
0
votes
2answers
1k views

How come writing varying file sizes results in varying speeds? [duplicate]

Here is some output from the dd command: $ dd if=/dev/zero of=test.file bs=10M count=1 1+0 records in 1+0 records out 10485760 bytes (10 MB) copied, 0.130214 s, 80.5 MB/s $ dd if=/dev/zero ...
0
votes
1answer
465 views

dd cloned drive not recognised by Windows

I have a Lenovo Windows 7 laptop with an MBR hard drive I want to clone. I used a Linux (Kali, FYI) live USB stick, booted on the PC and used dd if=/dev/sda of=/dev/sdc bs=100M conv=notrunc to clone ...
3
votes
1answer
6k views

Use losetup and dd to make filesystems images ready to be deployed

Introduction Using dd, one can easily backup the MBR and partition table of a disk. It's as easy as: dd if=/dev/disk2 of=~/Desktop/disk2_mbr bs=512 count=1 One can also backup whole partitions: dd ...
1
vote
1answer
91 views

A bootable usb key prevent system to boot

I'm written a ChromiumOS image on an usb key with the command dd. When I boot my computer with the usb key plugged, the start-up blocks just after the line describing the cpu, so before I can select ...
0
votes
0answers
190 views

Linux command to get FAT32 sectors of a file

I'd like to find an equivalent command to debugfs but for FAT32 partitions within Linux. I need to list all the sectors corresponding to a specific file (I'm working on a disk imaged with dd). If ...
7
votes
3answers
15k views

Can I use dd to clone a larger SD card to a smaller SD card if the actual partitions will fit?

I have a 16GB SD card that has a few partitions on it (it's actually the card for a Raspberry Pi). I have several other 4GB cards that I want to clone the primary card to. The 3 partitions on the ...
2
votes
2answers
912 views

Can I clone a large hard drive (with little data on it) to a smaller hard drive (with no data on it) with “dd”? Is there a better way?

I recently got a new desktop, and two hard drives to go with it: a 128GB solid state drive, and a 750GB hybrid drive. I installed Windows to the hybrid drive, but have come to realize that it would ...
0
votes
1answer
198 views

how to dd capture partitions of a VMware Player VM

I have a Linux VM that runs in VMware Player. It has /dev/sda1 mounted as /boot and /dev/sda2 mounted as /. I want to use dd to capture both partitions. I now know from the answer to this post that ...
5
votes
1answer
3k views

Attempting to access RAM /dev/mem… says “Operation not permitted”

I am using Ubuntu 12.04 I read the following tutorial on how to access the contents of RAM in Linux.... http://www.rootninja.com/using-dd-to-search-for-strings-in-memory-or-devices/ Code: dd ...
2
votes
0answers
196 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 ...
2
votes
0answers
76 views

dd backup produces bigger image file

I created a disk image with dd. The hard disk capacity is 2 GB. However, the image produced a 3.8 GB file. I used: dd if=/dev/mmcblk0 > /mnt/sd/disk0.img (where mmcblk0 is a microSD card, with 3 ...
0
votes
0answers
290 views

Operating System not found when loading DD image in VMware

I provide much details below to hopefully make my issue as clear as possible. Using dd if=/dev/ps3da2 of=/mnt/edexhdd/EDPS3LINUX.iso bs=16384 I copied a fairly huge partition from a physical Linux ...
2
votes
1answer
352 views

Are there any pitfalls to moving my Windows partition to a new hard drive using dd?

My current hard drive has an 80 GB NTFS partition running Windows (/dev/sda1) in addition to several Linux partitions. I purchased a new hard drive and want to move my Windows 8 partition to a new ...
1
vote
1answer
999 views

recover data after using dd command

Hi I have an Iomega HD for mac. I was writing a ubuntu server image to another drive but accidentally selected my 500GB Iomega with my files on it. The command I ran was: sudo dd ...
1
vote
1answer
301 views

Use ntfsundelete on dd image

I have a feeling the answer to this is right in front of me, but I am not seeing it. :/ I used dd to to create an image of a failing drive. Now, I would like to attempt to recover anything I can from ...
6
votes
2answers
12k views

using dd to copy partition to another partition, while using physical drive

I'm not sure how to explain this in the subject better, so the "question" may not be right. But here goes. I have three hard drives. Drive A is a 320GB drive, Drive B is a 80 GB Drive, and Drive C is ...
-1
votes
1answer
3k views

Make Live USB with dd

The last time I booted from USB was back in 2006. Ever since, I keep failing at making live usb bootables. I tried getting Fedora 18, Ubuntu, and ton of other distros to boot from USB and never ever ...
0
votes
0answers
394 views

dd Copies Drive with no Errors, Gparted shows Partitions as Empty, No Flags

So with the assistance of Hennes I was able to use dd to copy my entire sda to sdb, but after dd finished I checked the partitions with gparted and found that all partitions were listed as empty, the ...
0
votes
2answers
336 views

restore dd image to another usb stick failed

I'm trying to create a dd image which contains two partition. The first is a ext3,(19MB) the 2nd is fat32.(16MB) I use one 512M usb stick to create image. And use dd if=/dev/sdc of=image.dd bs=1M ...
0
votes
2answers
120 views

dd /dev/sda to img on drive

If I run: sudo dd if=/dev/sda1 of=~/image.img bs=1M Will the image.img (which is located on /dev/sda1) be continuously copied onto itself? As it gets bigger from data, will that additional data be ...
1
vote
3answers
5k views

How to create an image of a Live system over ssh?

I have a question about a FreeBSD server that I cannot access at the moment. But because we would like to try some new stuff we want to create a backup of this system first. The question is: is ...
2
votes
2answers
696 views

Difference between DBAN and dd command to securely wipe a HDD

I have read about dd and see that it can be used to securely wipe a HDD. But there is also a program called DBAN to wipe the HDD as well. I know that using a live gnu-linux ISO I can wipe my HDD by ...
3
votes
2answers
4k views

dd command to create bootable iso image of hard disk

Is it possible to use the dd command to create a bootable ISO image? I use the following command to do it: dd if=/dev/sda of=/mnt/sdb/my.iso I am able to create ISO, however I am not able to boot ...
0
votes
1answer
221 views

Poor compression of compact flash image, even after 0 fill

Problem: I am attempting to create an exact image of a compact flash and then compress the compact flash image for easier storage. The compact flash is not full (~1.5GB used, 32GB size). The problem ...
1
vote
2answers
230 views

Using the dd command on external hard drive with partitions

I want to write a .raw file to the first partition of my external drive. I tried: dd if=file of=/dev/sdb3 but it didn't give me a bootable drive since the correct command should had been: dd if=file ...
1
vote
2answers
481 views

dd - just copy partitions

I have a SanDisk Extreme SD card contaning my Homeserver runing on the RaspberryPI. I want to move this sytsem to another 4GB SD card using dd. But unfortunaltely when I make an image via dd it has ...
3
votes
1answer
5k views

How do you create and partition a raw disk image?

I need to create a raw disk image for use in a virtual machine, but I need to create the partitions before creating the file system or installing the operating system. Can anyone describe a process ...
0
votes
3answers
795 views

How can I untar a filesystem backup into a VM disk image?

I've been provided a .tar.gz archive containing the files from a VM file system (but not the filesystem itself) and I need to untar these into a raw disk image so that I may mount them as a VM. How ...
0
votes
1answer
88 views

How to use dd to make splitted ISO images from an storage device?

This is a double question, I just hope it's valid. I need to know how to use dd to make splitted ISO images from some storage device, I'm doing it through SSH: the process is slow and the risk of ...
2
votes
2answers
677 views

linux DD disk backup - file smaller than disk?

I got small problem. I need to make a mirror of a disk. Zero it and then restore data. I'm using DD linux command to copy data to a file. sudo dd if=/dev/sde of=/media/Rozne-new/hitachi_disk2.img ...
1
vote
0answers
653 views

Recover hard disk from Raw format

I have been all over the web today with no results. So my drive was encrypted (truecrypt) the whole drive where windows resided. I decided to partition it to install W8 and forgot it was encrypted. ...
1
vote
1answer
380 views

Improve dd restore speed

Just now after waiting about 33 hours I finished restoring hard disk dev.pm.m3 resided on the LVM partition from previosly created zipped dump 5_dev.pm.m3_2012-11-03.gz. Here is its status: gzip -dc ...
0
votes
1answer
2k views

testdisk - recover partition table

I destroyed my partition table of my laptop. Testdisk reports the below Disk laptop.img - 250 GB / 232 GiB - CHS 30402 255 63 (RO) Partition Start End Size in sectors >P ...
10
votes
1answer
2k views

What does an asterisk “*” mean in hexdump output?

I print MBR with hexdump and I get the following output: 000001a0 67 60 6f 70 65 72 61 74 69 6e 67 60 73 79 73 74 |g`operating`syst| 000001b0 65 6d 00 40 00 63 7b da c5 f5 61 68 00 40 00 40 ...