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

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dd - how to extract a subsection of a file with 2 offsets?

I have a file that I want where the starting byte offset is 3020852 and the ending byte offset is 13973824. There's some variation of this command: dd ibs=X obs=Y skip=1 count=1 that I haven't got ...
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1answer
16 views

Retrieve data from a mountable partition refusing `cp` but allowing `dd`

Recently, my internal drive failed after a manual reboot and I would like to retrieve the data before changing it. My computer is a Macbook Pro mid-2012 and the drive is formatted as HFS+. (From my ...
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0answers
20 views

Data recovery on flash drive showing incorrect size

I have a Kingston 32gb USB 3.0 flash drive that I need to recover data from. The problem is that the drive is now showing as 32.5kb of raw storage in Ubuntu (using gparted) and Windows is not ...
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20 views

ISO of not recognized DVD

I'm often dumping DVDs to ISO-files for backup by using dd on my linux machine. But now I've got a DVD in a filesystem that linux doesn't recognize. Still, I want to dump it's data in an *.img-file, ...
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2answers
40 views

In which case should I prefer dd over GNU ddrescue?

As far as I can see, comparing dd with ddrescue can be concluded saying that ddrescue is far better at rescuing data from broken data sources. dd does not have this ability. dd_rescue vs dcfldd vs dd ...
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31 views

readom and dd are creating different ISO-Images

When I am making an ISO-Image from a disc, according to the MD5-Hash of the created file, there is a difference between the data. They also differ in size. Tested on two completely different devices. ...
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1answer
64 views

Alternative to using usbcopy to create Solaris Text Installer USB stick

I have a blank T5120 server without any optical drive onto which I want to install Solaris 11.3. I downloaded the sol-11_3-text-sparc.usb installer. The docs tell me to use a tool named usbcopy to ...
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1answer
19 views

dd utility number of passes on bad block

In ddrescue you can set how many times to try to read from bad block (ddrescue -r1 will try once). It does not seem to be the case with dd. Does anybody know how many times dd tries bad blocks? ...
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19 views

Error converting custome bootloader .img file to .iso file

I am trying to convert a bootloader I wrote in Assembly Language to iso image file. The following is the code from MikeOS bootloader BITS 16 start: mov ax, 07C0h ; Set up 4K stack space after ...
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17 views

is DD possible to skip error and create problematic image without “noerror” option?

is DD possible to skip error and create problematic image without "noerror" option ? I am trying to dd the same thing twice and compare since sometimes there might be some random errors.
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1answer
41 views

Using dd command fails after the first mount

I am using dd command to copy disk drive /dev/sda on /dev/sdb. What I do is the following: I run dd if=/dev/sda of=/dev/sdb then mount /dev/sdb1 (note that /dev/sdb1 is not mounted on boot) to make ...
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1answer
49 views

How to calculate the required size of a partition backup from the block count of the containing ext3 filesystem

I need to generate a disk image containing the MBR, and one primary partition. The partition contains an ext3 Filesystem, which was resized to the minimum with resize2fs -M /dev/sdc1. I got the output ...
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1answer
134 views

How to use `dd` in order to restore the windows 7 backed up raw files into a new hard drive?

This is the typical case where the windows 7 installation had created a SYSTEM partition of about 1.1GB in size and another partition for the rest of the available space in a hard disk drive. ...
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1answer
100 views

Using dd to backup disk to same disk

I've tried using dd to back up my computer's hard drive, but I met with some rather confusing results. I've seen on multiple sources (e.g.: ...
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58 views

create an image of cloudlinux drive on VPS via SSH

we have a cloudlinux running on a VPS that we need to run some test's on. We do not have access to the VPS nor there is an option to clone this VPS. Is there a way for us to use dd or some other tool ...
6
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1answer
66 views

What steps am I missing in my attempt to create bootable Linux distribution image?

I am trying to create a distribution image (via Linux’s dd command) for an OS that will work with hard drives and flash media. I have been successful at creating the image, but I can’t get it to boot ...
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2answers
67 views

Wiping portable hard drive with DD in Linux [duplicate]

I’ve got 3 portable hard drives one is 160GB, the other two are 500GB. I want to write zeros to them using Linux and dd. I found this command: dd if=/dev/zero of=/dev/sda bs=? How for the block ...
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2answers
177 views

DD Bash backup issues - “unrecognized operand”

I’m using the Datto Block Driver to take snapshots of my running server every night. After the snapshot is taken, I dd the snapshot from /dev/datto0 through PipeViewer (pv) and gzip to a file on the ...
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1answer
67 views

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
982 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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0answers
35 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
48 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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29 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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74 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
30 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
45 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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80 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
26 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
73 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
145 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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26 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
149 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 ...
2
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1answer
145 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
134 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
157 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
70 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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136 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
84 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
81 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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0answers
89 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 ...
3
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2answers
47 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
112 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
793 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
459 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
150 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 ...
0
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1answer
132 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 ...
0
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1answer
54 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
408 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 ...
2
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3answers
114 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
341 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 ...