John Karr on 23 Sep 2009 13:47:53 -0700

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Re: [PLUG] ddrescue/dd_rescue question

download partedmagic.
It can mount ntfs partitions and copy them to another drive, and newer releases of partedmagic include clonezilla which is an open source alternative to ghost.
If you have patience, this will be the topic of my November PLUG Central Presentation.

From: [] On Behalf Of Gordon Dexter
Sent: Wednesday, September 23, 2009 2:39 PM
To: Philadelphia Linux User's Group Discussion List
Subject: Re: [PLUG] ddrescue/dd_rescue question

Art Alexion wrote:
Neither the man nor how-to pages on the web seem to answer this.

I want to try to rescue some files from a 300 GB NTFS partition. I have an empty 160 GB drive to use as the target. There are only 108 GB used on the NTFS partition. Do ddrescue and dd_rescue copy free space, meaning I need a 300 GB target, or will the 160 GB target be enough for the <108 GB of data?

I really only want to copy the user files. ddrescue/dd_rescue seem only to work on whole partitions. Is there a better solution that works as well on distinct source files? rsync, even with --ignore-errors freezes bash on this drive.

AFAIK dd_rescue, just like regular dd, copies every single bit on the hard disk, including the ones that are not in use by files.  You might be able to use dd_rescue to copy to a smaller hard disk if it supports writing a compressed image (e.g. gzip, bzip2) or stddout, but otherwise you'll have to have a bigger target.

I don't know of any programs designed to rescue specific files from a bad disk.  There are plenty of programs that will rescue files from corrupt filesystems (and perhaps you'll need one of those as well) but it's probably best to just save the whole contents of the disk and extract files later.

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