Do they have methods an ordinary person wouldn’t know or do they simply run a search ? Where would such info be kept on a Computer ?
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its very easy to do,plenty forensic progs will do it…same as theres plenty soft wear out there to ‘’shred” important details so they can never be recovered.
EDIT.
herd drives DONT need to be smashed to stop details being recoverd…i use a prog that writes and rewrites o and x on a drive…once its overwriten all info is gone.
Comment by desert camel — December 4, 2009 @ 4:36 pm
Files deleted by ordinary means can be easily recovered, as “deleting” only removes the “pointer” to the data. If the space that the data was occupying has not yet been reused, then a simple scan by software can detect it and recover it. Even if the data has been overwritten a couple of times, a comprehensive scan can detect residual magnetic fields, and may be able to piece together the old data. Methods of secure deletion often involve overwriting that old data space, over and over again, with zeros or random data.
Comment by Laughste — December 4, 2009 @ 4:36 pm
Data recovery is a specialist field in forensic science.
I don’t think there is any big secret about this despite what the other answerer said. It’s well known and there are plenty of articles about the subject.
Basically, data is store on normal hard disks using magnetism. Forensic scientists have developed techniques to scan the drive for traces of magnetic patterns, so it’s possible to recover data even when it’s been damaged, written over or deleted.
Also, when you delete a file on the hard drive, it doesn’t actually get deleted, it gets marked as deleted in a special area called the file allocation table. Which means the file is still there but it is just hidden.
Forensic scientists can use special tools to scan for these files and recover them even after deletion.
These aren’t secret tools, they are available for anyone to use, just search Google for Undelete and Unformat and you’ll see plenty of them.
The ones the authorities use are just better versions of these.http://www.altirium.co.uk
Comment by Darren — December 4, 2009 @ 4:36 pm
Its not just a search
When you store data to your hard drive and then erase it, it is still there on the drive until something else gets written over the top of the space it used. All that happens is that the index to what it was gets removed.
Also, even when something overwrites the space, there are still sort of ‘magnetic shadows’ of the data that was there earlier which can be recovered.
A safe delete program will shred all data by repeatadly writting random data over the top of that space until there is no trace of what was there before.
Comment by Paul F — December 4, 2009 @ 4:36 pm
because when you delete something normally all you do is delete the path pointing to the data the data is still there and fairly easy to recover if a person knows how. especially most criminals try to delete the evidence right before they are arrested. there is software that you can use to overwrite the entire hdd and it is said that if you use it enough times the data become unretrieveable by any method. but overwritting todays hdd drives takes a lot of time. bottom line if it can send you to prison do not store it on your computer.
Comment by james B — December 4, 2009 @ 4:36 pm
As someone who has been victim to such an investigation I can tell you a few things.
If they take your computer and you have it password protected chances are when it comes back it is gonna be F***ed up.
They do have ways of looking at the stuff you thought went away.
And last but not least you have to know that Yahoo and other Internet services keep word for word copies of e mails and IM messages for years . You could never get it but a court just has to ask..
Comment by Sassydud — December 4, 2009 @ 4:36 pm
Files that get deleted stay exactly where they are on the hard disk. The only thing that happens is that they get taken out of the ‘index’ of files – and the space they are using is marked as free and available for use.
Over time, as new files are written, the space the deleted file is in will eventually get used for a new file and the old data will be over-written.
Until then though, it is very easy to recover deleted files. 2 products I know of are very efficient at this. Recuva from http://www.recuva.com and handyrecovery from http://www.handyrecovery.com
I have used the second one many times to get deleted files back.
Comment by Marvin — December 4, 2009 @ 4:36 pm
Wow, so many bad answers. They do data recovery. When a file is “deleted”, only the index pointing to the file is deleted. The actual data is often still there. They can use special software and tools to access this data.
Comment by Mercuri — December 4, 2009 @ 4:36 pm
Because the history is never totally deleted from a hard drive. Same reason that if you give an old computer away you should actually destroy the hard drive. Smash it to smithereens.
Comment by Sal*UK — December 4, 2009 @ 4:36 pm
When you delete stuff off your computer you do not dispose of it completely it stays on your computer somewhere you just don’t notice it or not aware of it. That’s how they do that they know how to get into that.
Comment by Wordpress Autoblog Software — December 4, 2009 @ 4:36 pm
.its always in your pc somewhere.the 100% deletion way is remove and dispose of the hard disc.data recovery is not difficult if you have the tools and know how to use them.
Comment by askmenow — December 4, 2009 @ 4:36 pm
yes nothing gets deleted on a computer you can Google some computer forensic programs I have one the FBI use it pulls everything right back up again kinda scary actually if you defrag the hard-drives you get rid of your files only way otherwise they are still right there
Comment by Lee — December 4, 2009 @ 4:36 pm
If anybody knew that, the information would be spread across the web so fast and child pornographers would then have opportunity to hide the net perversion from the authorities
Comment by JIM — December 4, 2009 @ 4:36 pm
they can only sometimes do that because a lot of people don’t empty their trash, and it is stored in the hard drive i think
hope this helped.
Comment by bub — December 4, 2009 @ 4:36 pm
Registry keys etc.. Maybe?
I wouldn’t know that’s just a guess but the government keeps so many secrets who’s to say we’re not all being watched….
Comment by Future90 — December 4, 2009 @ 4:36 pm