[TriLUG] data recovery---Linux low-level format program available??
al johson
alfjon at mindspring.com
Sun Mar 24 02:05:12 EST 2002
Thanks for this info also. Everyone has been most informative.--AL
===================
----- Original Message -----
From: Vestal, Roy L. <rvestal at rti.org>
To: <trilug at trilug.org>
Sent: Thursday, March 21, 2002 9:56 AM
Subject: RE: [TriLUG] data recovery---Linux low-level format program
available??
> The paper map printed was for MFM/RLL/SCSI drives and using the old debug
> routine to tell the drive which ones were bad. I've used BCWipe to "wipe"
> the drive and set the drive back to 0's (zeroes). I've also used NDD to
> verify the drive. However, the newer versions of NDD don't run in a
command
> based window.
>
> Once I "wipe" a bad drive, this program has mapped the bad spots, because
> they are already written to the prom on the IDE drive. IDE drives do not
> use the same low-level formatting of SCSI/MFM/RLL drives, the latter are
> dependant on the controller you use. IDE comes with it's own controller.
To
> "overwrite" the translation table, would render the drive pretty much
> useless. It's up to the OS to write the bad sectors in it's file table
> during it's install. I always have Linux do a check for bad sectors during
> installation to get this fixed. Wiping the drive makes Linux, or any other
> OS, not try and salvage the data, it simply looks at the physical
> characteristics of the drive and runs the necessary tests.
>
> If you want to low-level a drive, then get a SCSI. If you want to use an
> IDE, then allow the OS to check the drive for bad spots.
>
> -----Original Message-----
> From: al johson [mailto:alfjon at mindspring.com]
> Sent: Wednesday, March 20, 2002 8:24 PM
> To: trilug at trilug.org
> Subject: Re: [TriLUG] data recovery---Linux low-level format program
> available??
>
>
> I went to the website and saw the program in question.
> However, I'm not really talking about a program that will just erase
(or
> wipe a hard drive, or do what used to be called a "high-level format"),
but
> a program which will test a drive to determine where the bad sectors are
> located and (and this is the most important part:) mark them so that data
> cannot be written to those sectors in the future!!
> The result is that the drive contains fewer bytes of storage space, but
> these fewer bytes will definitely be safe to use. In other words, a
> defective hard drive will be "fixed". Let me explain further (at the risk
of
> "over-explaining") what I'm talking about. It used to be the case that
when
> you bought a new hard drive there was a paper map printed on the outside
of
> the drive telling you which sectors were bad on the drive (and every map
was
> different because every drive varied in which parts of the drive had
> errors), this was because in those days every hard drive had such errors
but
> if they were identified to the OS then the OS wouldn't attempt to write to
> them.
> ===============================
>
> ----- Original Message -----
> From: Vestal, Roy L. <rvestal at rti.org>
> To: <trilug at trilug.org>
> Sent: Wednesday, March 20, 2002 9:16 AM
> Subject: RE: [TriLUG] data recovery---Linux low-level format program
> available??
>
>
> > Low Level format IDE. Not really necessary, since the onboard bios does
> > that, but a utility you can use under MS or Linux is BCWipe.
> www.jetico.com
> > is where to get it. It meets Finland and USA DOD wipe certifications.
> >
> > -----Original Message-----
> > From: al johson [mailto:alfjon at mindspring.com]
> > Sent: Wednesday, March 20, 2002 2:26 AM
> > To: trilug at trilug.org
> > Subject: Re: [TriLUG] data recovery---Linux low-level format program
> > available??
> >
> >
> > And if the drive is apparently not working anyway, you should definitely
> put
> > it in a plastic bag and put it in the freezer!! I've brought lots of
> drives
> > back to life with this simple trick. You must thoroughly defrost it
before
> > attempting to use it in your computer.
> > You just leave it at room temp. for 5-6 hrs. Don't laugh, it does work
in
> > many cases. If the drive does work, you should back it up as soon as
> > possible thereafter. And discard it after you've gotten your data back.
> >
> > Speaking of fixing hard drives, decades ago we used to "low-level
> format
> > hard drives" to fix them.
> > This process would mark all the bad sectors on the drive and you could
> then
> > use the drive as if it were new! Unfortunately, the software which did
> this
> > trick sort of disappeared (I'm assuming the drive manufacturers wanted
it
> to
> > die so they could sell more hard drives).
> >
> > I only mention this because I read somewhere that there was a LINUX
> program
> > which could low level format a hard drive. Anyone know if this is true
and
> > what the name of that program might be??? Al Johnson
> > KQ4FP at arrl.net
> >
> > =============
> > ========================
> > ----- Original Message -----
> > From: lfwelty <lfwelty at redback.com>
> > To: <trilug at trilug.org>
> > Sent: Monday, March 18, 2002 10:09 PM
> > Subject: Re: [TriLUG] data recovery
> >
> >
> > > Have you eliminated all hw issues, pwr, cabling?
> > > Have you tried booting the drive in another computer?
> > >
> > > Is this a scsi or ide drive?
> > >
> > > If ide, have you changed its master/slave settings
> > > since the original failure? You may have better luck
> > > booting off another drive and mounting the damaged
> > > drive as a slave on the ide...
> > >
> > > If you want to try to handle the recovery yourself,
> > > try taking a look at the LDP:
> > >
> >
>
http://www.linuxdoc.org/HOWTO/Linux-Complete-Backup-and-Recovery-HOWTO/index
> > .html
> > >
> > > Good luck.
> > >
> > > F.
> > >
> > > JoJo Almario wrote:
> > > >
> > > > The hard drive isn't even recognized in the bios. I hada backup
> script
> > > > running that would tar the files to a tape drive but somehow it only
> was
> > > > able to get 2 gigs of the 5gigs.
> > > > I tried the hdd in a different computer but it still wouldn't
> recognize
> > in
> > > > the bios. It had the whole home partition on it, with the boot,
root,
> > /usr
> > > > and /etc on the first drive. No RAID so I can't rebuild. I suck!
> Any
> > > > suggestions?
> > > >
> > > > -----Original Message-----
> > > > From: trilug-admin at trilug.org [mailto:trilug-admin at trilug.org]On
> Behalf
> > > > Of Sinner from the Prairy
> > > > Sent: Monday, March 18, 2002 4:46 PM
> > > > To: trilug at trilug.org
> > > > Subject: Re: [TriLUG] data recovery
> > > >
> > > > On Dilluns 18 Març 2002 10:32 am, JoJo Almario wrote:
> > > > > Does anybody know of a data recovery service anywhere in the
> triangle.
> > My
> > > > > drive went down and the back up was corrupted. There is mission
> > critical
> > > > > datat on there, so proximity is essential
> > > >
> > > > What is the problem?
> > > >
> > > > I recently recovered data from a HDD that had lost the partition
> table.
> > I
> > > > used
> > > > TestDisk from http://www.cgsecurity.org , an open source solution.
> > > >
> > > > Good luck!
> > > >
> > > > Salut,
> > > > Sinner
> > > > --
> > > > "I fart in your general direction! Your mother was a hamster and
your
> > father
> > > > smelt of elderberries!"
> > > > RedHat QA Test Engineer -- Running RedHat 7.2 on i386smp
> > > > http://www.ibiblio.org/sinner/
> > > > _______________________________________________
> > > > TriLUG mailing list
> > > > http://www.trilug.org/mailman/listinfo/trilug
> > > > TriLUG Organizational FAQ:
> > > > http://www.trilug.org/~lovelace/faq/TriLUG-faq.html
> > > >
> > > > _______________________________________________
> > > > TriLUG mailing list
> > > > http://www.trilug.org/mailman/listinfo/trilug
> > > > TriLUG Organizational FAQ:
> > > > http://www.trilug.org/~lovelace/faq/TriLUG-faq.html
> > >
> > > --
> > > ------------------------------------------------------------------
> > > Frank Welty | 15401 Weston Parkway, Suite 150
> > > lfwelty at redback.com | Cary, NC 27513
> > > Redback Networks | desk:919.678.2175 m: 919.264.7495
> > > ------------------------------------------------------------------
> > > _______________________________________________
> > > TriLUG mailing list
> > > http://www.trilug.org/mailman/listinfo/trilug
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> > > http://www.trilug.org/~lovelace/faq/TriLUG-faq.html
> >
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>
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