BitRaser Drive Eraser for Chromebook / 4. How to / 4.3. Begin Erasure Process / 4.3.1. Erasure Methods

4.3.1. Erasure Methods

BitRaser Drive Eraser for Chromebook offers four distinct erasure methods, each with a designated number of write passes. Write passes denote the number of times, the method overwrites chromebook erased memory.

The Erasure Methods are discussed below:

1. NIST 800-88 Clear: The algorithm of this method overwrites media by using organizationally approved and validated overwriting method. The features are discussed below:
   
   

• This method uses 1 write pass, thus will overwrite free space once.

• The free space is filled with randomly generated data.

• This method uses Total Verification as its verification method.

2. US Department of Defense, DoD 5220.22-M: This method uses an algorithm that erases data by overwriting the drive in three passes. This is a U.S. Department of Defense algorithm. The features are discussed below:
   
   

• This method uses 3 write passes, thus will overwrite data 3 times.

• The first pass overwrites data with Zeroes (0), the second pass overwrites data with Ones (1) and the third pass will overwrite the space with random data. 

• This method uses Total Verification as its verification method. 

3. Pseudo-random: This method uses an algorithm that erases data by overwriting the free space with randomly generated numbers. The features are discussed below:
   
   

• This method uses 1 write pass to overwrite free space.

• The free space is filled with randomly generated data.

• This method can use 3 types of verification methods: Total Verification, Random Verification, or No Verification. 

4. Zeroes: This method uses an algorithm that erases data by overwriting it with zeroes. The features are discussed below:
   
   

• This method uses a single pass to overwrite free space.

• The space is filled with Zeroes (0).

• This is the fastest available method for erasing.

• This method can use 3 types of verification methods: Total Verification, Random Verification, or No Verification.