Puppy Linux Discussion Forum Forum Index Puppy Linux Discussion Forum
Puppy HOME page : puppylinux.com
"THE" alternative forum : puppylinux.info
 
 FAQFAQ   SearchSearch   MemberlistMemberlist   UsergroupsUsergroups   RegisterRegister 
 ProfileProfile   Log in to check your private messagesLog in to check your private messages   Log inLog in 

The time now is Fri 28 Jul 2017, 03:04
All times are UTC - 4
 Forum index » Advanced Topics » Additional Software (PETs, n' stuff) » Utilities
ddrescue
Post new topic   Reply to topic View previous topic :: View next topic
Page 1 of 1 [4 Posts]  
Author Message
labbe5

Joined: 13 Nov 2013
Posts: 813
Location: Canada

PostPosted: Mon 24 Apr 2017, 11:53    Post subject:  ddrescue
Subject description: using ddrescue for rescuing failing HD or partition
 

ddrescue is not derived from dd. ddrescue uses an algorithm that copies data from failing hard drives if using ‘mapfiles’ or ‘logfiles’ only the needed blocks are read. Here is an example command.

ddrescue -d -r5 /dev/sdX test.img test.logfile

The -d is telling ddrescue to use the disk via direct access and to ignore the kernels cache.

-r5 tells it to try 5 times before giving up if your sure your drive is failing you may have to skip this option attempting ddrescue on a failing drive too many times may cause more trouble than it aims to solve.

/dev/sdX again replace the x for the drive your using ddrescue on with the help of lsblk if you wanted to use it on a specific partition you would make it /dev/sdX1 or /dev/sdX2 respectively.

Test.img – is the name of the file

test.logfile – in short always use a logfile it means you can start from where you left off if you need to or to retry some stubborn bad sectors on a HDD without this logfile you would have to start all over again.


This how-to is part of a website :
http://morpheusarch.co.uk/blog/2016/08/15/morpheusarch-linux-documentation/
Back to top
View user's profile Send private message 
Sylvander

Joined: 15 Dec 2008
Posts: 4271
Location: West Lothian, Scotland, UK

PostPosted: Mon 24 Apr 2017, 16:18    Post subject:  

I tried it and liked it. Very Happy

Here's my thread made at the time [2011]:
Anyone know how to use ddrescue [NOT dd_rescue]?
Back to top
View user's profile Send private message 
labbe5

Joined: 13 Nov 2013
Posts: 813
Location: Canada

PostPosted: Tue 02 May 2017, 11:12    Post subject: gddrescue
Subject description: using ddrescue to rip DVD encrypted or not
 

https://unix.stackexchange.com/questions/119823/ripping-dvd-in-debian-wheezy#119826

I use MakeMKV to rip DVD, and Handbrake to compress output files when needed, but there is another way to rip DVD using ddrescue.

If you don't care about the format, you can rip to an image of the DVD (as opposed to ripping to a video format, e.g. MKV, MP4, avi etc.).

For this I use GNU ddrescue -- it's available as gddrescue in Debian. Note that the binary is named ddrescue.

To rip, first install gddrescue and then use the following command:

ddrescue /dev/sr0 dvd_name.img dvd_name.log

The latter is the log file. If for some reason you need to halt the rip, having a log file enables you to start where you left off.

Using gddresue has the added benefit of the resulting image being as close as possible to the original. If you have two (or more) copies of the same DVD, but both are scratched, you may be able to make one perfect copy using gddrescue on both.


Supposedly, encrypted DVD can be ripped as well using ddrescue. See how with link above.
Back to top
View user's profile Send private message 
tallboy


Joined: 21 Sep 2010
Posts: 699
Location: Oslo, Norway

PostPosted: Wed 03 May 2017, 11:36    Post subject:  

http://www.gnu.org/software/ddrescue/manual/ddrescue_manual.html wrote:
Never try to rescue a r/w mounted partition. The resulting copy may be useless. It is best that the device or partition to be rescued is not mounted at all, not even read-only.

Never try to repair a file system on a drive with I/O errors; you will probably lose even more data.

Make sure that the drive is not mounted.

How can one find what type of errors there are, without doing more damage to a corrupt HD?

tallboy

_________________
True freedom is a live Puppy on a multisession CD/DVD.
Back to top
View user's profile Send private message 
Display posts from previous:   Sort by:   
Page 1 of 1 [4 Posts]  
Post new topic   Reply to topic View previous topic :: View next topic
 Forum index » Advanced Topics » Additional Software (PETs, n' stuff) » Utilities
Jump to:  

You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum
You cannot attach files in this forum
You can download files in this forum


Powered by phpBB © 2001, 2005 phpBB Group
[ Time: 0.0573s ][ Queries: 14 (0.0112s) ][ GZIP on ]