Questions tagged [dd]

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

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Use Rufus to create an image of a partition + restore this partition to disk on Windows

Can we use Rufus to save a local disk partition into an .img image file? Basically the Windows equivalent of: dd if=/dev/sda4 of=output.img Also can we use Rufus to write an image, not to a whole USB ...
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From VirtualBox VM (.vdi file) to a USB bootable ISO image

I have set up a virtual machine with Xubuntu Linux in VirtualBox. The disk is 4.5 GB a .vdi file. How can I make an IMG or ISO file from this, such that I can then write it into a bootable USB flash ...
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How to create an 1:1 image of an unencrypted mounted partition?

I am currently doing a forensic research on android. I am interested in the userdata partition, which is usually encrypted (i did not found a way to disable the file-based encryption on Android 10/11 ...
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Odd behavior by 'du' with `dd` on a BTRFS disk showing 0 filesize.. Anyone got some clues or thoughts around it?

Been tinkering with btrfs with consideration of moving from ext4 to that. However, when wanting to compare R/W speeds, I seem to have come across an (to me at least) unusual behavior by du on the ...
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How to access xfs partition encrypted with LUKS backed up with dd

How to access xfs partition encrypted with LUKS backed up with dd? Some time ago I've backup up two disks from old laptop. One of them was encrypted with LUKS and inside it there was xfs partition. ...
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dd: error writing to output file no more disk space, Is this normal?

I have a 4 disk NAS configured as a raid 5 but unfortunately the raid recently became unrecognisable, but the NAS boots fine otherwise. I'm in the process of cloning disks so raid recovery can be ...
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How to correctly view a restored DD (image-->partition) (Clonezilla) from an APFS filesystem?

Currently the partition which contains the restored image is unreadable by Windows.. So I attach that partition (inside the disk via USB) to a Mac computer and it also DOES NOT show up .. What am I ...
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Why my images created with DD have different sizes

I am working on cloning my Raspberry PI microSD cards in order restore then quickly. I use DD linux tool with SSH because they are difficult to access physically. From my computer, my command is : ssh ...
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How to read tmpfs as a block device in linux?

A typical linux machine mounts a tmpfs to store temporary files: $ df Filesystem Size Used Avail Use% Mounted on /dev/sda1 953M 702M 203M 78% / tmpfs 1.5G ...
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Can a broken cdrom drive cause I/O errors in programs like dd, ddrescue, etc.?

Can a broken cdrom drive cause I/O errors in programs like dd, ddrescue, etc. even if the disc itself doesn't contain bad sectors? Note that I'm interested in purely technical, factual answers, not ...
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What does the dd command do?

If I make a copy with the "dd" command from a block device say 8 GB to a 16 GB block device, the content of the first device is copied to the second device until it is full? (that is, until ...
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DD'd my secondary internal drive - recover anything?

So I "failed successfully" at DD-ing a 20G image to a USB drive. As a result, I now have a 20G GPT partition table (MBR, UEFI and a BTRFS partitions) in the beginning of my former ext4 ...
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Searching for strings in a dd image, extracting data from it

I am trying to recover the contents of a text file that became corrupt following a power outage. The file size is still correct (14 MB), but the text in the lower half of it has been replaced by ...
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remove MBR of corrupted disk with 0 bytes

My Problem is that I have a external SSD drive which got corrupted and shows: Disk /dev/sdc: 0 sectors, 0 bytes And Problem reading disk in BasicMBRData::ReadMBRData()! Warning! Read error 22; ...
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backup then restore when drive sizes differ

I would like to backup a Windows 10 machine ( 256gb internal drive ) onto an external SSD drive ( 1 tb ) ... however to do this backup if I boot up using a Ubuntu LiveUSB memory stick then issue the ...
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DD image with no empty space of the volume

I want to create a DD image of a Volume of OSX from mac with none of the empty space, only the used space with data on it , to reduce the size of he img/dmg/raw file. I've tries multiple software but ...
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Fastest way on Windows to copy 38GB of files to 50 USB drives

If I were doing this, on linux or Mac, I would make an NTFS RAM drive mount it copy the 38GB folder hierarchy to it save the RAM drive to disk insert a USB drive determine the name of the raw device ...
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pipe-lining using wget or curl on linux

I would like to know how can I download a file from the internet using wget and/or curl by separating the file into even segments and downloading the file using 8 or 16 direct links, substantially ...
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Any easy way to verify in-line raw NTFS image

I just got a new laptop probably with Windows 10 on it, and I created a raw dd image of its hard drive for safe keeping by booting off of a Debian live USB and running the following: dd if=/dev/...
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Windows dd Command: Access is Denied Error

I need to create a .dd image of one of my drive in windows, For this I chose dd utility. However it is generating aforementioned error while creating image. I have opened command line as Administrator....
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writing image to hard drive and mount it without reboot

live rootfs update script My goal is to copy a disk image over the only harddrive of the system while the system is running and copy data to the new partitions afterwards. I tried to do this by: ...
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Cannot mount new hard disk after using dd command to copy old hard disk

I wanted to create a backup copy of my external HDD (/dev/sda) to new HDD (/dev/sdb). Initially, old HDD had one ext4 partition and new HDD had one exfat partition. I did the following. $ sudo dd if=/...
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dd shows more than write speed of my SSD

I was testing write speed of my SSD, but I saw different behaviors and much more speed than the actual speed. These are results: saeed@vbinna:~$ dd if=/dev/zero of=here bs=1M count=1024 1024+0 records ...
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Restoring the partition table and a fsarchiver backup from a dead disk to a new one

My openmediavault server's ssd disk died, and I replaced it with a new one (different brand, same capacity). Now I wanted to restore my last backup made with fsarchiver via the omv backup plugin, and ...
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Copying raw partition sequentially, in chunks, with error recovery

Normally if I want to copy a raw partition /dev/sdaX (with i/o errors when reading), I would just go with ddrescue <src> <dst>. The case here is that I'd like to be able to copy this ...
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Why are read / write sequential and not parallel?

I copy data from one disc to other sudo dd status=progress if=/dev/sdc of=/dev/sdd ibs=1G obs=1G But I notice that read/write are done sequential: Is there a way to make it parallel to speed up ...
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dd without any options

What does dd command do when ran without any options ? [hannah@lenovo ~]$ dd ^C0+0 records in 0+0 records out 0 bytes copied, 7.71982 s, 0.0 kB/s Does it delete any files or it's nothing to worry ...
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I accidentally cloned my 16GB SD card to my 256 GB pendrive using dd. Is there any way to retrieve back my pendrive?

I have a 16GB SD card, which when I connect to my computer, gives cant read superblock error (in Ubuntu). After searching on internet, I saw some solutions using testdisk tool and decided to try it ...
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5 votes
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Linux - accidentally used dd on a LUKS encrypted drive, is there a way to recover?

I accidentally ran dd bs=4M if=image.iso of=/dev/sda oflag=sync when creating a bootable drive instead of targeting the USB stick. I am fairly certain most of the files would be fine - the iso is only ...
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Unable to boot DD'd Windows 10 drive

NOTE: Already posted at https://unix.stackexchange.com/questions/657563/unable-to-boot-ddd-windows-10-drive . After no activity there for almost 5 days, and no option I have used in the past to move ...
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I used dd command to burn the iso file of windows10 but the usb has not been detected in BIOS

I use linux OS. I downloaded the iso file of win10 from https://www.microsoft.com/en-us/software-download/windows10ISO And burned it to the usb using sudo dd if=Win10_21H1_English_x64.iso of=/dev/sdb ...
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Backup ext4 on LUKS to an external drive if the size of the target drive is less than the size of the source drive

I have a few spare 1TB marked SSDs that I'd like to use for my primary NAND backup. I'd prefer to have dd for dumping everything as it is - but the tricky part is that my NAND has about 1.5 GB more ...
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Will tools like shred, wipe or dd (or hard drives in general) check that a write was successful?

I usually use shred to delete complete hard drives. But I was wondering if and how tools like shred, wipe or dd verify that the expected bits end up on the hard drive. Does a hard drive always check ...
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Cloning a Windows 10 Hard Drive with dd

I'm migrating a Windows 10 install from a SATA 3 SSD to an NVMe drive for a friend. The plan was to image the drive, give the original disk back to my friend so he can use it in the meantime, and once ...
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Cloned Disk with dd in Linux Live Image

I used dd to clone with an Ubuntu Live Image from a smaller SSD to a bigger one. During the cloning process Ubuntu freezed. I waited some time and did a hard shutdown. After rebooting it seems the ...
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1 vote
1 answer
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How come I can't write to the last byte of the the last block?

I was doing some tests by writing random patterns of data at a block size of 512 bytes (the size of blocks on my drive) and dd fails at the last block saying that the device ran out of space. I was ...
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After cloning, the system Windows 8.1 shows the size of the smaller disk

I have ask a related question elsewhere. I have cloned 4TB HDD onto 8.TB but the system (Win 8.1) shows the size of the lower of the 2 disks, i.e. the size of the source while cloning. How do I assign ...
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2 votes
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Bad Superblock when mounting LVM SSD

I made a complete copy of my Fedora boot ssd using dd however the new drive does not boot correctly and is not mountable when connected via usb enclosure on a different machine. I get a bad superblock ...
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how to dd /dev/sdX to /dev/mmcblkX?

I made a Debian 10 system image in virtual machine and written it to external HDD. I wanted to copy the system to a laptop's disk, but it has SSD disk that shows up as /dev/mmcblk. My system has 3 ...
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Hard drive stops working during ddrescue and is making odd sounds

We have an older HDD (WD Black 500 GB) that was still in use for the data it had but then at some point, Windows wouldn't boot with the drive installed. I checked with a Linux installation and the ...
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4 votes
1 answer
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How can I recreate an installer iso from a usb (Mac/Windows) using dd?

I have read many "how do I write an iso to USB" questions. I am looking for a way to reverse the process. My question is about taking a USB stick containing a Windows installer or Mac ...
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Getting blocks of zeros after flashing SD card with dd

I've got a problem with writing an SD card with an image. What I want to do is to create an image of an SD card from files present on my hard drive. My plan is to: Create a loop device and connect it ...
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1 vote
1 answer
136 views

Migrate Operating System to a new Disk with dd or other linux tools

I have 1 TB HDD, and a new 250 GB SSD. The HDD has these partitions: 499 MB (EFI) 256 GB (Boot, Page File) - Only 120 GB of this partition is used. the rest is free. 499 MB (Recovery Partition) 736 ...
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How to checksum a SquashFS filesystem on partitionless HDD

# lsblk -f /dev/sda NAME FSTYPE FSVER LABEL UUID FSAVAIL FSUSE% MOUNTPOINT sda squashfs 4.0 # mount -v /dev/sda /mnt mount: /dev/sda mounted on /mnt. $ df -B1 Filesystem 1B-blocks Used ...
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2 answers
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Luks header overwritten with dd

I've copy and pasted too fast from a tutorial and overwritten the LUKS header from one of my drives with dd. The used command was: dd if=/dev/urandom of=/dev/sdb bs=512 seek=1 count=100 And now: ...
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How to mirror an NVME SSD onto another?

I'm not sure what the technical terms are for this, but I'm having the following problem: The internal SSD of my laptop died and set itself to readonly. It has all the recovery partitions and all that ...
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What's the difference between dd into a file and dd into a physical disk

The size "openwrt-19.07.6-x86-64-combined-squashfs.img" image is 20MB. If I change the file name to "openwrt.raw", I can import it into virt-manager and boot into the system. But ...
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How can I use the dd command to clone a USB drive?

I have created a USB with a Linux distro on it and would like to clone it to another USB drive. The drive with the distro on it is 256GB, the distro is on roughly 8GB partition of USB drive. The drive ...
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dd vs diskutil: which is faster when it comes to writing zeroes?

When I want to erase a disk, both dd and diskutil are viable options. To erase a disk with dd, I usually run something like dd if=/dev/zero of=/dev/$device bs=4096. The equivalent of this in diskutil ...
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Can I use dd with a mounted partition?

I would like to backup my /home (nvme0n1p3) partition to a backup.img file using dd. Can I do that while the partition is mounted?
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