[dba-Tech] Retrieving Deleted Files off a hard drive

Formattting a drive will only remove the FAT (File Allocation Tabe),
that the index of where the files are positoned on the drive.
Formattig does alos put some positionmakers on the disk (that why you
loose useable data on the disk) to find it way on the disk.
 
It like a citymap (simply stated) You have an index saying that stree x
is positioned in the square B7.
Formatting removes the index (creates an empty one) and puts a new grid
(the quares A7) in pace.
But the data of the old streets are still there.
 So it is just a question to put to put the pieces togheter and build a
new index (simply stated).
Custers that are overwritten by the format or by new data will corruot
the old file but the rest of the file is still readable.
 
There are companies that can rebuild your disk, within 30 minutes,
depending on the size and fragmentaion.
 
Only way to clrear a disk is to write random data on each cluster thus
distroying the old data.
there does exesits software to do that.
 
Erwin
 

	-----Oorspronkelijk bericht-----
	Van: Martin Reid [mailto:mwp.reid at qub.ac.uk] 
	Verzonden: vrijdag 1 augustus 2003 11:05
	Aan: Discussion of Hardware and Software issues
	Onderwerp: Re: [dba-Tech] Retrieving Deleted Files off a hard
drive
	
	
	AFAIK unless you overwrite the data several time using specific
software then its possible to get most things back. One of our guys says
the only way to be totally sure is to melt down the HDD.
	 
	Martin

		----- Original Message ----- 
		From: Jon Tydda <mailto:Jon.Tydda at alcontrol.co.uk>  
		To: 'Discussion of Hardware and Software issues'
<mailto:dba-tech at databaseadvisors.com>  
		Sent: Friday, August 01, 2003 9:45 AM
		Subject: RE: [dba-Tech] Retrieving Deleted Files off a
hard drive


		I formatted a hard disk with windows 95 on it, then
plugged it into a pc running 98. I ran scandisk and all the files came
back, so I guess format ain't everything.


		Jon 

		-----Original Message----- 
		From: Stoker, Kenneth E [mailto:Kenneth.Stoker at pnl.gov] 
		Sent: 31 July 2003 20:50 
		To: dba-Tech (E-mail) 
		Subject: [dba-Tech] Retrieving Deleted Files off a hard
drive 


		Everyone, 

		I recently had a discussion with a coworker about the
subject of retrieving deleted files off a hard drive.  We got on the
subject because we are having an audit on those company-owned computers
systems that some staff may have at home for business use.  He claims
that any file can be reclaimed, even if a defragmentation has been run.
I thought that once a disk has been defragmented, those files were truly
gone, if the anyone defragmented the disk, the audit would basically be
a waste of time.  Is this true?  The computer security group here is,
I'm sure, quite good, don't let any limitations be considered in any
advise returned to settle this score.  

		If it is possible, does that also apply to a reformatted
disk?  I would think that a reformatted disk would be the ultimate
cleanup, but that would have me wondering now if a defragment doesn't
work.  Which would cause some serious concerns at this location as much
of the stuff that I work with is very sensitive and would make me wonder
about correct processes when buying a new machine and excessing the old
one.

		Thanks for your help in settling the discussion. 


		Ken Stoker 
		Technology Commercialization 
		Information Systems Administrator 
		PH: (509) 375-3758 
		FAX: (509) 375-6731 
		E-mail:  Kenneth.Stoker at pnl.gov 


		_______________________________________________ 
		dba-Tech mailing list 
		dba-Tech at databaseadvisors.com 
		http://databaseadvisors.com/mailman/listinfo/dba-tech 
		Website: http://www.databaseadvisors.com 


		The information in this e-mail is confidential and may
also be legally 
		privileged. The contents are intended for recipient only
and are subject 
		to the legal notice available on request from :
webmaster at alcontrol.co.uk 
		ALcontrol Laboratories is a trading division of
ALcontrol UK Limited. 
		Registered Office: Templeborough House, Mill Close,
Rotherham, S60 1BZ. 
		Registered in England and Wales No 4057291 

		
  _____  


		

		_______________________________________________
		dba-Tech mailing list
		dba-Tech at databaseadvisors.com
		http://databaseadvisors.com/mailman/listinfo/dba-tech
		Website: http://www.databaseadvisors.com
		

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://databaseadvisors.com/pipermail/dba-tech/attachments/20030801/371eae0f/attachment.html>