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

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How to read an dar archive via LTO-6 tape

The /data folder was saved on tape with dar -R /data/ -c - | mbuffer -R 110M -P 90 -m 1G | dd of=/dev/nst0 bs=256k How can I test, list and extract it? I tried the following to test the archive ...
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3answers
906 views

Why does dd sometimes not wait until data is written?

Sometimes, when I write images to a flash drive, this happens: $ sudo dd if=install57.fs of=/dev/sdc 573440+0 records in 573440+0 records out 293601280 bytes (294 MB) copied, 0.549231 s, 535 MB/s ...
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21 views

How to create sector by sector image from live Windows?

I need to create image from live Windows XP, which later will be restored using linux dd command. Unfortunately I can't boot linux there to make that clone, for technical reasons. So the only way ...
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2answers
31 views

Using dd to write zeroes to CF card on USB Card Reader causes much reading

I am zeroing a CF card using dd dd if=/dev/zero of=/dev/sdg Watching the system using gkrellm or iostat I see lots of reads from the CF card device, followed by bursts of writes. With this ...
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15 views

Truncate empy space from a raw dd image

I have a raw disk image I took using dd of a Ubuntu instance. The total disk size is 300 GB, but only 5.5 GB used. Is there a way to resize the raw dd image down to 20 GB, keeping all of the 5.5 GB ...
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23 views

USB read only with recursive filesystem

I have a USB flash drive 4GB Sandisk Edge After "DD"ing to make a live USB, the drive failed to boot and after checking it, the whole drive is broken. When using Gparted shows: | Partition | File ...
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1answer
11 views

dd over ssh poor network throughput performance

I am running a raw block copy of one ec2 instance to another ec2 instance over a local ssh connection using a large block size of 16MB. ssh -i ~/.ssh/id_rsa ubuntu@10.0.59.92 'sudo dd if=/dev/xvda1 ...
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1answer
16 views

Perform dd from input file, excluding last 4 bytes of every block

I have a very large file (999,952,379,904 bytes to be precise), which is a partial disk image. Looking at it in a hex editor I have found that the structure is as follows: 0-2073 byte offsets ...
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36 views

How come monitoring the status of a write to USB isn't reliable?

I write ISO files to USB thumb drives a lot, and I'm trying to find a way to monitor the status of a write. Googling this, I have found a bunch of solutions, including pv, dcfldd and the USR1 signal ...
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1answer
11 views

How do I recreate a Rasbberry pi OS from partition images?

I have a Raspberry PI that I cant take offline. Using DD I have backed up the /dev/root/ and the /dev/mmcblk0p5 boot partitions on to a windows network share. How do I restore images taken using ...
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2answers
42 views

zero a large block device with parallelized dd

We have a sixty terabyte block device which we want to zero using dd. Is it possible to parallelize this operation in order to reduce the amount of time it takes? I've tried running the following ...
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1answer
52 views

What's the difference between dd and cat for writing image files?

When writing image files to disk or to a USB stick, the instructions usually use dd, like this: dd if=myimage.img of=/dev/sdb How is this different from, say: cat myimage.img > /dev/sdb I ...
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14 views

Are dd read/write tests using dsync reliable under RAID?

I'm performing performance testing of some new hardware, and I was quoted from a vendor what kind of performance i should get from a dd command using the oflag=dsync option. However this amount was ...
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1answer
39 views

Why am i getting Very slow dd dsync test results in Linux.

I am investigating slow application issues with some New Hardware and am running into some odd results. I am trying to determine what is causing this behavior. I am using dd if=x.b1 of=x.b10 ...
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1answer
41 views

How to backup MBR with dd for Windows?

I am using dd for Windows to back up. I can back up partions on windows like this: dd if=\\.\g: of=x:\bottom_C_XP1.dd but when it comes to backing up master boot record of harddisk2 I cannot find ...
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4answers
75 views

How To Format A Disk Image To Be Recognized By MS-DOS?

I'm trying to emulate windows with bochs on my android device. I've got the following drives: an empty disk image to install windows on, a virtual vvfat drive with the setup files, and a cdrom drive ...
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1answer
62 views

How To Make A Sparse File On Android With Terminal

I'm trying to make a sparse file on android. For this I'm using Android Terminal Emulator. I have installed Busybox so I can use the dd command. Other commands like truncate aren't installed. My ...
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1answer
22 views

Linux and DD - Infinite time to extract one file

I use dd on Linux to extract data from a tape (yeah it's really oldschool!) and I had a problem. Sometimes, when I extract a file (from different files on one tape), after a really long time and a ...
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0answers
51 views

Writing image to SD card regardless of size under Windows? [closed]

I have an SD card image that contains a layout with a boot and a root partition of an existing linux system. Both partitions are located within the first 8 GB of the card and the image. The original ...
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2answers
34 views

When are bs and count settings for dd wrong?

(By wrong I mean "will break things".) Suppose we're about to use dd. We've chosen a valid set of if, of, and possibly seek and skip. We've carefully ensured that the command will not write past our ...
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2answers
41 views

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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40 views

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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2answers
41 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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1answer
62 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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3answers
168 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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1answer
148 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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1answer
54 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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1answer
57 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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1answer
40 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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2answers
137 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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3answers
58 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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1answer
122 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 ...
3
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1answer
93 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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3answers
122 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 ...
3
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2answers
170 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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55 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
246 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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135 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
39 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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151 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
41 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
34 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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68 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
83 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
359 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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31 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
41 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
153 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 ...
2
votes
1answer
41 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
161 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 ...