Windows

Why is Data recovery is almost impossible from an overwritten Hard Drive

Presently, Data loss is inevitable and happens almost all the time. With the Data Recovery Market place, data recovery is possible. Not all data recovery solution out there is possible of recovery lost data, by careful selection and reviews, you should be ineveitable to select a suitable product.

Note: Recovery of any lost data is only possible if the data has not been overwritten and this is because the operating system does not retain any previous trace once it is overwritten.

What Happens When You Delete a File: Windows (and other operating systems) keep track of where files are on a hard drive through “pointers.” Each file and folder on your hard disk has a pointer that tells Windows where the file’s data begins and ends. When you delete a file, Windows removes the pointer and marks the sectors containing the file’s data as available. From the file system’s point of view, the file is no longer present on your hard drive and the sectors containing its data are considered free space.

However, until Windows actually writes new data over the sectors containing the contents of the file, the file is still recoverable. A file recovery program can scan a hard drive for these deleted files and restore them. If the file has been partially overwritten, the file recovery program can only recover part of the data. Note that this doesn’t apply to solid-state drives (SSDs)

Therefore, deleted or overwritten data is possible and recoverable only when data does not get deleted itself (despite having it deleted from the recycle bin), only the sector where the information is stored is removed. Digital Information (data) Information is stored in the form of bytes and each of these bytes includes 8 bits. The value of these bits is either 0 and 1. Therefore, all information stored on your PC is in the binary code of 0’s and 1’s. Data saved to HD are non-volatile and magnetic, the reason being that you require no power to maintain the saved data and each magnet has plus and minus pole representing the binary code.

How data is Saved in Random Access Memory: The manner in which information is stored is always the same i.e. Binary Code. The idea is that RAM is an amalgam of integrated circuits including Transistors and Capacitors, and even they save data in bits form. The principal difference here is the Storage type is volatile. Therefore, when power s removed, information is lost.

What to do when you notice Data Loss ‘Deleted Files: If you’ve accidentally deleted a file and need to get it back, there are some things you should bear in mind:

  • You should recover the file as soon as possible: As Windows continues to write files to your hard drive, the chances of it overwriting the deleted files increases. If you want to be sure you can recover the file, you should perform a recovery immediately.
  • You should try to use the hard drive as little as possible: The best way to recover a deleted file from a hard drive is powering the computer down immediately after the file is deleted, inserting the hard drive into another computer, and using an operating system running on another hard drive to recover it. If you try to recover a file by installing a file-recovery program on the same hard drive, the installation process and normal use of the hard drive can overwrite the file.

Why Data Recovery is Impossible from an Overwritten Hard Drive: Hard Drive Recovery from Overwritten Hard Drive is impossible as it is an irreversible process. The reason being, when you overwrite the data, you magnetize the HDD magnetic domains. Hence, you physically eliminate Data formerly saved on the location. Indeed, few residual physical changes traces are left behind in magnetization and can assist in Partial Restore. But, it demands the usage of Magnetic Force Microscope and the probability of successful Data Recovery is almost negligible.

I hope you found this blog post helpful. If you have any questions, please let me know in the comment session.

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