Question: I've heard of companies finding data that people thought they had deleted from their work computer. How do they do that? Might be good information in case I accidentally delete some important files from my home computer too!
Answer: Yes, there are several ways to retrieve data that has been deleted from a computer system, even if you've deleted them from the recycle bin or reformatted your hard drive.
I accidentally deleted a year's worth of family photos and financial documents on my wife's laptop, after using the factory restore CD that reinstalled Windows and removed her user folder where all the pictures were stored. Even after that mistake, I was still able to recover all of the files.
When you delete a file, Windows only marks the file as deleted, but doesn't actually remove it from your system.
Those files are only truly deleted (well, replaced actually) when other data is saved to the same location on your hard drive.
If you accidentally delete files from your system, they can usually be undeleted - even if you deleted them from your recycle bin - as long as you attempt to recover the files shortly after you delete them, and before Windows saves other data in those same file locations on your hard drive.
If you've accidentally deleted an important file or erased a folder containing files that you later realize you still need, chances are good that they're still on your system and can be recovered.
The key is to use a good undelete program like iRecover that can find files that have been deleted - even if you've emptied your Recycle Bin.
Here's a screenshot of iRecover that shows all of the files and folders it was able to recover on my system, and this was after I had completely cleared out my Recycle Bin:
I've tried a few different programs that claim to be able to do this, but have discovered that some of them are only able to show you what's still in your Recycle Bin (not much help if you've emptied your Recycle Bin).
iRecover will also help you recover data that was lost because of file system corruption, formatting, virus damage, partition deletion, or even just plain user error.
Here's a link to download iRecover. It will tell you what it can recover for free, so you'll know if it's worth paying for the licensed version.
I bought a Seagate FreeAgent 320 GB USB External Hard Drive.
This new drive plugs in via USB cable and doesn't require any installation or configuration. Windows automatically recognizes it when you plug in the USB cable, and it has plenty of space for backing up both of my home computers.
I also highly recommend that you backup your hard drive on at least a monthly basis, although weekly is even better.
If you're looking for a good backup program for your home computer, I recommend Genie Backup Manager which I use for my home systems. I consider myself fortunate to have been able to retrieve our family photos and financial documents... and my wife is finally willing to speak to me again.
However, I'm hoping to avoid this whole scenario in the future by making regular backups to this new backup drive (at least weekly).