We already know that data recovery programs are able to get data back by scanning data remanences on deleted files and formatted hard drives. So how can we wipe out all the data remanences on the hard drive? First let's check out what does this phrase mean in wikipedia.
Data remanences definition in Wikipedia:
Data remanence is the residual representation of digital data that remains even after attempts have been made to remove or erase the data. This residue may result from data being left intact by a nominal file deletion operation, by reformatting of storage media that does not remove data previously written to the media, or through physical properties of the storage media that allow previously written data to be recovered. Data remanence may make inadvertent disclosure of sensitive information possible should the storage media be released into an uncontrolled environment (e.g., thrown in the trash or lost).
So if we have sensitive information on the storage device we want to disposal, it's indeed necessary to get rid of with nothing on it. We have many ways to ensure data cleaning; the follows are recommended solutions from wikipedia:
Data Remanences controls:
Various techniques have been developed to counter data remanence. These techniques are classified as clearing, purging/sanitizing, or destruction. Specific methods include overwriting, degaussing, encryption, and media destruction.
ByebyeData Eraser is the software uses the overwrite methods to erase data remanences. Although it mainly focuses on the States' standards, it does have some other country's standards, like German Standard, VSITR. Besides, it enables to do the 35-pass overwriting, the Peter Gutmann's algorithm, if you want to overkill the hard drive.
Erase data remanences standards:
|United Kingdom||ADISA ||Yes||NO|
- CSE: Communications Security Establishment Clearing and Declassifying Electronic Data Storage Devices, July 2006.
- ADISA: Asset Disposal and Information Security Alliance (ADISA), ADISA IT Asset Disposal Security Standard