Erasure algorithms are a set of rules and instructions or in other words – a formula to destroy the data from a memory device by overwriting it with random bits (values/characters) of data either once, twice, or several times and verifying it at the same time. The data erasure tool such as BitRaser File Eraser offers multiple erasure algorithms that ensure data is destroyed beyond the scope of recovery. Therefore, it’s important that you completely destroy the data from your storage devices by using a data erasure tool before disposing them off, discarding them or else donating them to someone. Thus, the actual data still remains on the drive and can be easily recovered with the help of a basic data recovery tool. Deleting a file only removes the entry of the file (pointer) from the file index in a file system. This again should not be of significant worry for consumers as consumer level disk recovery software would be unable to recover from those special blocks.Deletion is never secure. Data is unrecoverable by consumers.Īs others have pointed out, with SSDs, there are other "reserve" blocks of memory which do not tend to be overwritten when preforming a disk wipe (especially generic disk wipes). The advantages of these types of drives is that by changing the key used for encryption, one can have some level of confidence that the data is not recoverable.
Each write to drive is first passed though the drive's controller which encrypts data before it is written. Some older consumer SSDs (and some newer ones) are SEDs, or Self Encrypting Drives. More importantly, a study done by the University of California San Diego showed that an ATA secure erase command may not sufficiently destroy data:
This can brick drives, as some overwrite firmware as well. An ATA secure wipe (if available) will tell the controller to "release the charge in the NAND chips", effectively making it appear that there is no data on the drive.
Some drives conform to higher ATA standards than others.
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