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Re: dd_help missing from stretch repos

On 3/15/18, Felix Miata <mrmazda@earthlink.net> wrote:
> My new 2TB HD just arrived. Old 1.5TB to be rescued, made in 2010, has 8
> pending
> sectors reported by smartctl. e2fsck locks up the PC trying to fix its EXT2
> filesystem. I know if anything could bail me out, dd_rhelp could.
> Debian bugs Google found about dd_rhelp:
> https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=252198
> https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=254759
> I see gddrescue in the repos, but my experience with dd_rehelp is only
> favorable. Can someone tell me how they compare, or even if they are
> comparable?
> Do Debian users simply extract the script from the lastest archive version
> on
> www.kalysto.org and run it?

Hi, Felix.. I don't have that answer you need, but I tried doing some
"apt-cache search" on your various forms of "dd_help". "safecopy" came
up for "dd help rescue" so I'm throwing it out there in case it offers
features of interest.

This part of safecopy's description stood out for me:

"This media can be floppy disks, harddisk partitions, CDs, DVDs, tape
devices, where other tools like dd would fail due to I/O errors."

I'm familiar with seeing those I/O errors. How safecopy actually works
in reality, I don't know, but I do have an old, damaged hard drive
with really important files trapped on it. I might try to find that
old hard drive and give safecopy a shot myself, actually.. :)


Description-en: data recovery tool for problematic or damaged media
 Safecopy tries to get as much data from SOURCE as possible, even resorting
 to device specific low level operations if applicable. This is achieved by
 identifying problematic or damaged areas, skipping over them and continuing
 reading afterwards. The corresponding area in the destination file is either
 skipped (on initial creation that means padded with zeros) or deliberately
 filled with a recognizable pattern to later find affected files on a corrupted
 device. The work is similar to ddrescue, generating an image of the original
 media. This media can be floppy disks, harddisk partitions, CDs, DVDs, tape
 devices, where other tools like dd would fail due to I/O errors.
 Safecopy uses an incremental algorithm to identify the exact beginning and
 end of bad areas, allowing the user to trade minimum accesses to bad areas
 for thorough data resurrection.
 Multiple passes over the same file are possible, to first retrieve as much
 data from a device as possible with minimum harm, and then trying to retrieve
 some of the remaining data with increasingly aggressive read attempts.
 Safecopy includes a low level I/O layer to read CDROM disks in raw mode,
 and issue device resets and other helpful low level operations on a number
 of other device classes.
 Safecopy is useful in forensics investigations and disaster recovery.


Good luck, whatever you end up using.. :)

Cindy :)
Cindy-Sue Causey
Talking Rock, Pickens County, Georgia, USA

* runs with duct tape *

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