How to 100% purge/clean hard drive?

[billethkid]

I will soon be getting my new desk top. After I transfer all my files/programs to the new one, I would like to delete everything from the old one's hard drive. I have heard that a hard drive cannot be 100% cleaned.

Is this true? What do you recommend....other than drilling holes in the old hard drive.

btk

[zcaveman]

I purchased a disk caddy and took the drive out of my old PC and use it as an external drive for backup with my new PC.

[aljetmet]

Go to download.com They have free or very inexpensive software for all sorts of programs. I'm sure you can find something there that can accomplish what you want. Zs suggestion is a good one. I have two such drives....

[JeffAVEWS]

Run a heavy duty magnet over the drive, it will trash it!

[rjm1cc]

You can reformat the disk if your program will allow. Breaking the disk is probably the safest method.

[jimbo2012]

Saltwater will do it, years ago tried a magnet didn't work.

I would toss it, new ones R so cheap now.

[billethkid]

I already have a remote hard drive. Even the pro type stuff seem to qualify just how clean is clean. Starting to look like rifle and pistol target practice.....coming up!

btk

[2BNTV]

Using it as a back-up is a good idea if your so inclined.

A couple of whacks with a hammer will trash the old one if you want to ensure it will not be used again.

[Geewiz]

Deleting/reformating only lays a new layer of oxide over the old data...the old data still exists and can be read with easy to obtain software. To totally secure this data you have some choices....get the hard drive near a very large and powerful magnet (and that's kinda iffy) or drill out the hard drive (a whole bunch of holes) anbd then soak in a bucket of saltwater or chemical corrosive. Of course you can just hide it in plan sight with the lable "Little Bobby's Bar Mitzva"...who the hell would wanna access that? Cheers!

[logdog]

Eraser.net has a program that will overwrite your hard drive multiple times so your original data can never be accessed. I've used it before and it seems to work well (and slowly).

[Geewiz]

Trust me it can be read....I did this for a living. You either have to scramble all the layers of oxide (and even then you can get some data) or physically destroy the disc. Multiple layers of oxide might make recovery harder and could complicate efforts...but, good techs will recover enough.

[jimbo2012]

Your absolutely correct, a forensic guy can get the data.

Toss it if U have sensitive data.

[Gat0r]

As the copiers at staples and office depot have hard drives anything you have copied is on them.Tax returns and etc. set the disk away in a few years no one will care to read your disk.

[rubicon]

Forensic guys can get data from computers that have experienced water or fire damage. My suggestion call don vito and he will send you a cleaner:D

[Geewiz]

If you can't spin the disc over readers without damage to the readers (because the disc was drilled with a slow drill) makes it harder and costlier to obtain data...also, saltwater and/or corrosive chemicals further limits data recovery. Of course, if NSA believes your data to be a national security issue then cost and difficulty do not factor in and they will recover the littlest bits of data and turn it over to the FBI who has experts who can make sense of the smallest amount of raw intelligence. That said...labeling the disc - "Little Bobby's Bar Mitzva" will likely curtail their efforts.

[Steve Nagy]

There is a free utility out there cdalled Eraser that does a pretty good job. It writes random data over all the unallocated sectors, which is way better than just re-formatting the thing.

That is good enough if all you are trying to do is keep dumpster-divers out of your Quicken data. It will probably stymy local law enforcement as well.

If you have something you would rather the FBI not find, complete physical destruction is your only hope. They know how to find shadow copies from a restore point and all that.

[l2ridehd]

You need to physically destroy the disk. Cut it in half with a carbide metal saw, then smash those halves with a sledge hammer. Drops those smashed halves in a bucket and dump some type of acid on them. Then bury the remainder in a deep dark hole. Destroying the surface so it can never spin or be removed somewhat intact is the only solution.

There is no program that can over write a drive so it can never be read. They can make it harder and more expensive, magnets can force you to unscramble, but the original data can be recovered with enough time and money.

Now depending on what you have on those drives will determine what method you use. I cut mine in half, smash with a sledge, then throw the pieces in the trash 1/3 a week for three weeks. Not fool proof, but very safe.

[ajbrown]

I typically recycle my computers to an old buddy that fixes them up and gives them to folks who need them. I do not want him to have to buy a new drive.

I have felt comfortable using 'boot and nuke' for years. Darik's Boot And Nuke | Hard Drive Disk Wipe and Data Clearing (http://www.dban.org/)

For me personally I feel I can raise the cost of recovery beyond the value of any asset I have on the disk so the probability of anyone getting anything is almost zero. It is much more likely I lose that asset in some other way, i.e., a robbery, ineptness of someone who also has information about me for on line banking, bill paying, etc.

I boot and nuke the drive (I forget the exact options). It does take some time to make several passes.

[john.np2b]

there are several programs out there, a free one is called something like derik's boot and nuke, it is free. Another is produced by White Canyon software, they have several versions, you can go to their website, I think the software you are looking for is $30.00.

[Shimpy]

Your absolutely correct, a forensic guy can get the data.
.

I , several years ago heard a talk show interviewing a forensic expert for the FBI. He said the only reliable way to make it so data couldn't be retrieved was to grind it to a powder or melt it into nothing.

[wine5465]

I was given a program called Deban. I never had anyone test to see if it worked though.

[Computer Corner]

I will soon be getting my new desk top. After I transfer all my files/programs to the new one, I would like to delete everything from the old one's hard drive. I have heard that a hard drive cannot be 100% cleaned.

Is this true? What do you recommend....other than drilling holes in the old hard drive.

btk

Before you go attempting to remove your data, and especially before you start 'drilling or soaking' a perfectly good hard drive, you need to understand how data works! There are perfectly safe ways to remove your data.. which I will explain at the end of this post. First you need to understand how computers handle the deletion of data.

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The following article was originally posted on our website, and can be found here: WARNING! DELETE DOESN'T ALWAYS MEAN DELETE! (http://www.cflgeek.com/1/post/2012/02/delete-doesnt-always-mean-delete-part-1.html)


DELETE doesn't always mean delete! (Part 1)
02/26/20120 Comments


We've all been there, the moment when you realize that you have deleted 'that very important file'. You know which file I'm talking about. It's the family pictures, or videos. Its the file you needed for your 'big project', or for 'the meeting'. It's the file that you worked hours on, meticulously slaving in front of your computer screen, spell checking, revising, grammar checking, revising, and so forth into the wee hours of the night. And then, in just one second with the wrong mouse click, you accidently deleted it and.. POOF! Its gone! Or is it?

" The truth is, when you delete something on your computer, it isn't really deleted."

The truth is, when you delete something on your computer, it isn't really deleted. When you press delete on your keyboard, or select delete from a menu, all you actually do is instruct the computer to remove the file from its File List, giving the computer permission to rewrite on that space, in the future. To understand how this works, think about your home. Deleting a file would be like removing the 'Mailing Address Numbers" from your mail box, and door way. By doing so, your house wouldn't cease to exist, but it would certainly be harder for the Pizza Delivery guy to find you! In the same way, when you delete a file from your computer, you are actually deleting the virtual address the computer uses to find that file. In other words, when you delete your file, the system doesn't "replace" or "Zero" the space, it simply frees it up to be reused at a later time. It is only when the file has been overwritten that it is actually deleted.

The reason your Operating System does this is to save time, and system resources. Just like your home, if you wanted to go 'off the grid', tearing it down would take a lot longer than simply removing the street address. Imagine trying to "overwrite" a large file that occupies lots of sectors on your hard drive. To really delete this file from your hard drive your computer would actually have to overwrite the data with new data. This could take a lot of time. Instead it simply removes the file name from the directory where the file is located and marks the sectors the file us as 'available space'. To reuse the house example we used earlier; Imagine if you put a sign in your front yard saying "FREE SPACE! BUILD WHERE YOU WANT". It may not take long for your house to be 'deleted' too! But, in the meantime... It's still there!

What does this mean for you?

Well, this could be really good news, or for some, really bad news! Why? Because, since your data wasn't really removed form the disk, it is possible to recover a deleted file. Even over long periods of time, and even after disks have been 'reformatted'! To do this Special Recovery software can be used to scan any storage device(like your hard-drive, thumb-drive, etc.) and search for these 'address-less' files. Once found, these files, as long as they have not been overwritten by new data, can be fully recovered, or in other words; a new address can be assigned to this property, taking the "FREE SPACE" sign out of the yard! Welcome back to the grid!

We saw an example of this during the famous "Casey Anthony Trial", where federal prosecutors where able to go back years into deleted history files to discover searches that were made from Casey's computer, like "chloroform".

This is welcomed news for those of you who need 'that file' for 'that meeting', but this also leads us to a very important security concerns if you have or have had very private, or confidential information on your computer, that you wouldn't others to find. Fortunately for you, there are also means of fixing this problem too! We will cover that in our next Blog "Delete Doesn't REALLY MEAN DELETE! Part 2"

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Now how to remove that unwanted data.. Here is a VERY BRIEF OVERVIEW:

1. Start by DELETING all the information that you don't want. (as I explained avove, this doesn't actually erase it, but it basically adds an extra layer of security, because eraser programs will search for deleted content to remove data from.
2. Reformat the drive. (and contrary to popular belief, Reformating does nothing do destroy data) Once again, this is just another step in prepping the drive to be officially erased.
3. Remove the drive from the machine in question. (If you are attempting to erase a drive that is in use, you will be locked out of a lot of important areas on the data structure.
4. Using another computer mount the drive, and use a program called Eraser. This program gives you an option between 1-32 passes, and is used by government agencies to properly wipe a drive.. I recommend at least 3 passes on your entire drive. Though technically one pass is more than enough..

I will be writing a new blog on this process at our website: Central Florida Geek- Computer Repair, Web-Design, Home Theater, iPhone repair, and More! - Technology Specialist, Affordable Computer Services Leesburg and Mt. Dora (http://www.CflGeek.com) so stay tuned.:024:

[batman911]

I say drill holes in it and bury it in the back yard. Then plant an oak tree directly above it.