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

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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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3answers
269 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
570 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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0answers
108 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
587 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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277 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
64 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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462 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 ...
3
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1answer
47 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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1answer
63 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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121 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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1answer
139 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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1answer
1k 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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0answers
39 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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1answer
53 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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0answers
239 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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votes
1answer
54 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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1answer
321 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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1answer
474 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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0answers
130 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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0answers
133 views

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 ...
0
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1answer
320 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: ...
0
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1answer
133 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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0answers
46 views

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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2answers
1k 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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1answer
60 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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1answer
653 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
110 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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1answer
625 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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votes
2answers
16k views

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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2answers
81 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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2answers
155 views

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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2answers
1k 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 ...
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3answers
776 views

How do I wipe a USB drive using dd on cygwin on Windows?

I am trying to use dd to wipe a usb drive using Cygwin on Windows. What should I use for the of argument? dd if=/dev/null of=?
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1answer
1k views

Write iso files to usb sticks with dd

So far I have always succeeded at creating bootable USB, until yesterday. I tried creating a bootable USB for Arch Linux, Chakra OS, and Ubuntu this way: Locate my USB stick: lsblk # My drive is in ...
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2answers
329 views

Linux Full Disk Backup of a Remote System?

I have a home file server in the following configuration: 4 HDDs of 2TB each 1 USB flash drive running the Debian OS of 8GB I would like to make a full disk backup of the OS flash drive to another ...
0
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1answer
436 views

Cloning md partitions for recovery

I have a failed software RAID5 (3x500GB disks) that I'm trying to recover. I don't want to try some of the more risky steps on the actual disks, so I want to clone them to new partitions on a new 3TB ...
0
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1answer
84 views

Expand size of disk image after dd operation

Background : I used the debian wheezy raspberry pi build, a generic kernel image with qemu to build a raspberry pi image. I copied the resulting image to the SD card with dd. That SD card is a 16 gb ...
0
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1answer
196 views

Does dd care when cloning from smaller hdd to bigger hdd?

Does DD care about hard drive size? I currently have a smaller 500GB HDD that i want cloned to a 1TB SSD. Will it clone without a problem relating to size? will there be non partitioned space? was ...
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0answers
893 views

Disk Cloning Probelm

I'm trying to clone a Windows 7 Pro installation from one SSD to another. The current SSD is nearly full, so I'm cloning it to a larger disk. My problem is that there is something about the source ...
0
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1answer
545 views

Use dd to copy an HFS+ volume in linux

I have a friend's HFS+ external drive from her Macbook. We created a new similarly-sized partition on a different external drive, also using the Macbook. From everything I understand about dd, it is ...
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2answers
683 views

DD the fastest way

I have this "disk list" table: /dev/disk2 #: TYPE NAME SIZE IDENTIFIER 0: FDisk_partition_scheme *16.4 GB disk2 ...
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1answer
170 views

'dd' command on Damn Small Linux?

I looked at the package list of DSL, and I don't see 'dd'. For example I would like to restore /dev/sdb from an .img file like so: dd bs=1M if=/home/myname/image.img of=/dev/sdb What command do I ...
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2answers
512 views

Any way to boot a OpenSuSE installation DVD ISO and install from it, without burning it to a DVD?

Because the DVD image is too big to fit on a disk, I would like to install system using sequence of commands like this, running from an Ubuntu live CD: cd /tmp wget ...
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0answers
42 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 ...
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1answer
472 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 ...
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1answer
1k 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 ...
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votes
2answers
2k 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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votes
3answers
3k 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 ...
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1answer
325 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 ...