[TriLUG] OT: Laptop Hard Drive

[Charles Mangin]

Ah. Thanks for the clarification. I seem to recall trying both dd and dd_ at one point long ago, due to confusion about the names. I've had such good success with dd_rhelp that I never bothered to try the other again. 
-- 
Charles Mangin
option8 at option8.com

David Burton <ncdave4life at gmail.com> wrote:

>Wrong "ddrescue."   dd_rhelp works with Garloff's dd_rescue, rather
>than Diaz's
>ddrescue <http://freecode.com/projects/addrescue> (a/k/a GNU ddrescue).
>
>IMO, Diaz's ddrescue is superior.
>
>Dave
>
>
>
>On Sat, Nov 19, 2011 at 10:58 AM, Charles Mangin
><option8 at option8.com>wrote:
>
>> I've followed this thread off and on, so if this has already been
>> mentioned, please forgive.
>>
>> For doing data rescue with ddrescue a helper script called DD_rhelp
>is
>> super handy. It automates the process of skipping over damaged
>sections,
>> then backing up to recover the good bits. It's my goto for data
>rescue on
>> drives that aren't so damaged they need more hardcore techniques.
>> --
>> Charles Mangin
>> option8 at option8.com
>>
>> David Burton <ncdave4life at gmail.com> wrote:
>>
>> >On Sat, Nov 19, 2011 at 8:25 AM, Joseph Mack NA3T <jmack at wm7d.net>
>> >wrote:
>> >
>> >> On Fri, 18 Nov 2011, David Burton wrote:
>> >>
>> >>  ddrescue will never recover part of a sector.  SpinRite will do
>> >that, but
>> >>> ddrescue either recovers a sector or it doesn't, nothing
>in-between.
>> >>>
>> >>
>> >> if sector 0,1 and 3 are OK, but sector 2 is not, what does
>ddrescue
>> >do on
>> >> the target piece of disk? write 0,1, then hop over 2 leaving
>whatever
>> >junk
>> >> was there and then write 3?
>> >
>> >
>> >Yes.
>> >
>> >Note, however, that the ddrescue "log file" keeps track of which
>> >sectors
>> >have been recovered and which have not.  I.e., you can tell the
>> >difference
>> >between the recovered data and "whatever junk was there."
>> >
>> >In recent versions of ddrescue there is also a "--fill" option that
>can
>> >be
>> >used to write zeros to unrecovered sectors; see "fill mode" in the
>> >documentation:
>> >http://www.gnu.org/software/ddrescue/manual/ddrescue_manual.html
>> >(A variant of the --fill option does the opposite: aim it at the bad
>> >drive,
>> >and it writes zeros everywhere except the bad sectors, so that you
>can
>> >return the drive for warranty replacement and it will still test
>bad,
>> >but
>> >will not contain any of your data.)
>> >
>> >Also, some versions of Linux (including Parted Magic) apparently
>don't
>> >let
>> >ddrescue access individual sectors, even with the the -d option
>> >specified.
>> >On those versions of Linux, the granularity is usually 4kb (8
>sectors),
>> >so
>> >if any of the 8 sectors in a cluster are unreadable the other 7 are
>> >unrecovered, as well.
>> >
>> >Dave
>> >--
>> >This message was sent to: Charles Mangin <option8 at option8.com>
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>> --
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>-- 
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