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Questions tagged [ddrescue]

`GNU ddrescue` is a data recovery tool for block oriented media.

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DDRESCUE - How to re-run first pass (don't do reverse yet)?

I ran ddrescue for a few days, and recovered about 60G. It had slowed to a crawl, and had an ipos of about 90M. I started again, adding -a100000, and it got another 35G in only 3 hours. It started the ...
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DDRescue Rescue Rate Concern

I'm in the process of using DDRescue on a 896 GB partition of my 1 TB Toshiba HD. After almost 5 days it's rescued only 7% of my data (according to terminal input). I paused the program for the first ...
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What is the purpose of the -t (--truncate) option of ddrescue?

When specifying an output file without specifying a logfile, the output file will be truncated anyway. How exactly is using ddrescue -t /dev/devicename outfile functionally different from ordinarily ...
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gddrescue slow transfer, but no bad sectors [closed]

I recently noticed my 2ndary internal HDD was having issues when I wanted to back up information to my external HDD. 1.4 TB out of the 2TB was being used. My transfers rates were plummeting to 0 and ...
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1answer
114 views

How can gnu_ddrescue be resumed to wipe a hard disk? [closed]

Hard drives (non-SSD) are generally wiped with the command dd if=/dev/urandom of=/dev/sdX conv=fsync status=progress. Since power outages do occur, this lends to restarting the wipe process multiple ...
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35 views

Usage ddrescue with -d option?

I am learning to use ddrescue and I would like to know what the -d (direct) option is for and in what scenarios it is recommended to use.
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36 views

Datarescue with ddrescue location of files

I am recovering a 2TB harddisk with one NTFS partition with ddrescue. Only 300GB of the 2TB are used (mainly photos). My problem is that I have not 2TB availbable on the rescue pc. Can I assume that ...
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65 views

SD card img created with dd is all zeros [closed]

A computer illiterate family member asked me to recover photos from an SD card she used in her camera. She went to fetch them from her computer when it informed her that the device needed to be ...
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35 views

Generate gddrescue log file from badblocks list?

I have a list of badblocks. How do I generate a gddrescue mapfile/logfile from it? Assuming that the sector size is known. This is the reverse way of Generating dead LBA list from gddrescue mapfile/...
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32 views

Unreadable block in multiblock reading on dd / ddrescue: How does it handle it?

Let's say that I set the block size of dd or ddrescue to 256K. A sector of flash drives usually has 512 bytes, a sector on optical data discs has 2048 bytes. Let's assume that in the next 256 KB, ...
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1answer
41 views

Generating dead LBA list from gddrescue mapfile/logfile?

I ultimately would like to know which files in images generated by (g)ddrescue are affected by damage. gddrescue (command ddrescue) is a tool for recovering data from damaged media. When specifying ...
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Can dvdisaster recover optical discs better than gddrescue?

gddrescue is more universal. But both tools are just limited by hardware restrictions. If a CD's sector is unreadable, the drive usually refuses to let the computer know about the subcode. For ...
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Batch processing a ddrescue mapfile with debugfs

I have a mapfile produced by ddrescue which lists 418 bad sectors where each line looks like this (the minus indicates a bad block): Position Size 0x1CC7C68000 0x00001000 - By converting the ...
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487 views

Get contents of ddrescue image file

I have a failed harddrive with around 400 GB of data, of which approximately 50 GB need to be recovered. All the data is located in a specific directory (/Fotos2018/). The hard drive is a WD My ...
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1answer
562 views

Why is ddrescue slow when it could be faster on error free areas?

This question addresses the first pass of ddrescue on the device to be rescued. I had to rescue a 1.5TB hard disk. The command I used is: # ddrescue /dev/sdc1 my-part-img my-part-map When the ...
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1answer
225 views

ddrescue .NTFS file can't open file

I have just rescued an old damaged HDD to my 8TB drive and I've got 1 .IMG file. I then took the 8TB drive to my work Windows 10 machine and used 7-zip to extract the file. Then I got 2 .NTFS files ...
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586 views

Using gdisk on drive with valid MBR and corrupt GPT

All: I ran ddrescue from a 1.5 TB input (corrupted) Windows external drive that was formatted NTFS to a 8 TB (uncorrupted) Western digital external drive that was formatted ext4. The 8 TB drive was ...
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492 views

In ddrescue, should the target drive be formatted the same way as the damaged drive?

Friends: I have 3 brief questions about ddrescue. This is the operation that I want to run: sudo ddrescue -f -n -v -v -v -v /dev/sdi /dev/sdh RescueHD10.log For me, the output drive "/dev/sdh", is ...
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648 views

ddrescue: How to retry for 1 bad block after all other data is safely stored?

I used ddrescue yesterday hopefully to retrieve 1:1 copy and stored it as an image on a new drive. Suppose I read backwards, because I knew, that there is a bad cluster at the beginning of the failing ...
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72 views

Linux AHCI/ATA read errors not reported

After a recent OS upgrade (to current Tumbleweed, Linux Kernel 4.16.0 from April 4th), when reading from a faulty hard disk or from damaged/scratched DVDs, I don't get anymore read errors in the ...
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196 views

How to set ddrescue image sector size?

I have ddrescue image and want to recover data from it. But the image is taking wrong sector size it should take 4096 and the partitions are btrfs partitions. How to change the sector size? $sudo ...
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98 views

Can't mount image created with ddrescue (SFS partition)

I am trying to recover data from a HDD. For this purpose I am using Knoppix 8.1 on a DVD. Running sudo fdisk -l gives me the following results for the specified HDD: Gerät Boot Anfang ...
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1answer
375 views

use gddrescue to clone device into multiple image files

I try to rescue data from my 1TB external drive using ddrescue because I accidentally deleted everything from it. Practically I have to face exactly the same situation like posted here: How to split a ...
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1answer
459 views

Hard drive unreadable

The 500GB Seagate ST9500420AS (D005SDM1) hard drive in my 2011 Dell XPS 15 crashed the other day and, although I had the most important data backed up, I would really like to save the rest of it. It ...
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60 views

save lost data by ddrescue

I have lost datas in a memory card. So, I decided to use ddrescue. Fine. But after running command sudo ddrescue -f -r3 /dev/sdb1 /dev/sda5 logfile, I lost all my data in /dev/sda5. I don't know why....
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823 views

dd, ddrescue, dd_rescue performance according to OS (Ubuntu, macOS)

I put this question: recover files from HSF+ USB External HD, test on CentOS 7 to diagnostic And this https://askubuntu.com/questions/955325/using-gpart-testdisk-to-recover-gpt-for-files-from-...
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2answers
1k views

Recovery of damaged DVD yielding “no medium found” error

I have a very strange case of DVD reading failure. It's a video DVD recorded a couple of years ago on a DVD-R disc. Two weeks ago our video DVD player would start having trouble reading parts of it. ...
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0answers
341 views

ddrescue - avoiding sectors that shut the controller down

I have a problem with my SSD drive – it would appear that the controller started acting up. What happens is that if requested to read specific sectors, it will completely shut down the access to disk. ...
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1answer
1k views

ddrescue taking months, what options do I have?

I'm trying to rescue data from a failing external USB drive from a friend. The problem with the drive is that it cannot be read, not in windows, not in linux. But I do manage to run ddrescue on the ...
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1answer
5k views

Faster disk recovery (ddrescue running slow)

I am learning the value of having good backups. I have a 500GB hard drive which is failing. I started running ddrescue /dev/sdb1 backup.img mapfile and it was going to take 40 to 70 DAYS, ...
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1k views

How can I find out which files are lost through a ddrescue recovery atempt?

I am in the process of salvaging data from a 1 TB failing drive (asked about it in Procedure to replace a hard disk?). I have done ddrescue from a system rescue USB with a resulting error size of ...
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364 views

Force disk onto /dev/sdX

I'm trying to ddrescue (through rescueCD) a drive, which keeps spinning down. e.g ddrescue -N -n -A -M -f /dev/sdk /dev/sdd mapfile Without rebooting I can get the drive for a short while through ...
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156 views

How to mount an Apple device from Linux?

I would like to mount an Apple iPad to my Linux device, to make a jpeg or ddrescue recovery on it. How I would do this with an Apple device?
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92 views

dd rescue to same model drive -will it fit

First time using ddrescue. 3Tb drive was showing errors and going offline (in windows only) so I've booted from a stick into systemrescuecd and used ddrescue -f /dev/sde /dev/sdb /mnt/rescue/mapfile ...
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165 views

ddrescue a drive

Background: I have attempted to rescue a drive which seems to have corruptions using the following commands: ddrescue --no-split /dev/hda1 imagefile logfile ddrescue --direct --retry-passes=3 /dev/...
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1answer
1k views

ddrescue image can't be mounted

I am trying to recover the data from an external HDD for a friend. I am using Knoppix latest version booting it from USB. I created an image (.img) using a tutorial for ddrescue, but now I have the ...
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Why does ddrescue not utilize full bandwidth?

I am running ddrescue from disk A to disk B. I had expected the slower of the disks would be running at full speed all the time and the other be running enough to keep up. Imagine my surprise when ...
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Understanding what ddrescue is telling me

Essentially what I want to know is, has ddrescue made any progress? Is my hdd pretty well dead? After executing sudo ddrescue -d -r3 /dev/sdb dos_pace.img dos_pace-ddrescue.log on a USB 2.0-...
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Strange df output after ddrescue clone

My old harddisk was having I/O error last week so I tried to copy the data out to another new disk intending to rescue the data. I use ddrescue: ddrescue -f /dev/sda1 /dev/sdb1 my_mapfile After I ...
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1answer
397 views

Full Image of internal HDD, drive - dd / dd_rescue - with TrueCrypt [bad sectors] [read error]

Background I had a problem under Windows with ndis.sys [sys don't start] Status: 0xc00000e9 Info: Windows failed to load because a critical system driver... To repair I had to fully decrypt drive [...
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1answer
221 views

bitwise-OR 2 binary files

I did 2 rescue attempts on a dying HDD a while back; I ran (GNU) ddrescue first, and then straight dd with manual seeking. I want to get the best of both images. Since any empty stretches in the files ...
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1answer
98 views

Migrating a failed hard drive — preventing fsck

I have a hard drive which has suddenly developed unstable sectors. I am able to read it with dd_rescue, so I transferred it completely to another new drive of the same size. The Windows partition is ...
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1answer
6k views

Using ddrescue to retrieve data off a failing ntfs disk

I am attempting to save some user data of a disk that has failed in a Window 8 computer. I've removed the HDD that was unable to be read by the Windows 8 laptop, plugged into my OS X machine which can ...
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454 views

Is ddrescue actually doing anything here?

I'm trying to do recovery of a suddenly failed 1TB hard drive. I ran ddrescue in two sessions. The first command was ubuntu@ubuntu:~$ sudo ddrescue -f /dev/sdb /dev/sda /media/ubuntu/...
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1answer
998 views

recovery of usb flash drive: extracted image is full of zeros

A usb flash drive (SanDisk cruzer micro 4 GB) of a friend of mine stopped working, no partition table is left (the only filesystem of partition should have been FAT32 or NTFS). And yes, there is no ...
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1answer
790 views

SafeCopy manually finish ISO

Good Morning, I am currently helping a good friend to recover her broken 1TB external HDD. She dropped the drive and now, it cannot be mounted anymore. After some research I gave safecopy a try. I am ...
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71 views

Ddrescue: can the data differ if I have erroneously mounted the drive on windows?

I'm trying to rescue an USB ext HD 2TB using ddrescue on a linux VM, host is win. Everything worked fine, rescued almost all, there are 60MB of errors left to work out. So I had some problems on the ...
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2answers
379 views

Using DD Disk Image on Red Hat

How can I use dd command on a Linux Red Hat Server 5 to obtain a disk image and then use it eventually in Virtual Box?
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2answers
947 views

Extracting DDrescue image file after pass 1

I am trying to recover data from a failing usb hard disk using ddrescue. I ran ddrescue for about 4 days at the end of which it completed pass 1. Sometime after it began with pass 2, I interrupted the ...
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2k views

How to change current copy position or skip over area in ddrescue

I'am currently trying to recover data from a failing 3TB WD Red drive using ddrescue. After two weeks I got about one TB, but then read speed doped to a few thousand bytes per second and it would now ...