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Deleting a file does not completely remove it from a computer. Formatting the hard drive or using data erasure software can more effectively erase deleted files, but there is no guarantee of complete removal.
While putting a file in the trash and then deleting it can be a good way to get rid of a file, the truth is that the file is still there. The thought that the file is completely gone is a common misconception, but more advanced computer users are becoming aware that deleting a file actually does no such thing. It just hides the file from your computer. For those who find this puzzling, there are several ways to more completely erase deleted files.
One of the easiest ways to erase deleted files is to format your hard drive. Usually, this will clean up your system completely, and even programs that are usually used for recovering deleted files won’t be able to find them. This is one of the more drastic ways to get rid of files, but it usually works.
Another way to erase files that have been deleted is to use a data erasure program. There are two types of data erasers. Some are used for single files. Others are used for the entire hard drive. Which option you choose is usually up to you, but not all software products are compatible with both. Users should understand the difference in software products before purchasing. If not, there is a good chance that the consumer will be disappointed with the product.
Software that performs a full data erase is very similar to formatting the hard drive. This will completely erase the deleted files, along with all other files on your computer. Those using this option should be very aware of this and ensure that there are backups of all important files. This is the only way to fully recover anything you want after the software is done with the job.
Other types of software used to erase deleted files can only be used for individual files. This is probably the situation that most computer users will prefer. This will keep all other files on the machine and save the user from the lengthy process of reinstalling all the desired software products on the computer. This type of software is sometimes called a data shredder and basically writes to the file multiple times with random data. The more times a file is overwritten, the more difficult it is to recover the original information.
For those who are particularly concerned about sensitive information, it should be noted that there is really no way to guarantee any method used to erase deleted files. There could always be a chance that some data will remain on the hard drive in recoverable form, especially since technology is constantly changing on both sides of the equation. Aside from physically destroying your hard drive and installing new hardware, you can get something back if you put enough time and effort into the task. However, in most cases, data destruction programs will do an adequate job of deleting unwanted files, unless the individual looking for it is extremely well trained.
