CompTIA Server+ (SK0-005)Security and Disaster RecoveryMedium
A company is decommissioning several older hard disk drives that contain sensitive customer data. Simply deleting the files and reformatting the drives is deemed insufficient. Which method provides the highest level of data destruction to prevent forensic recovery?
- AOverwriting with zeros
- BLow-level formatting
- CSecure erase utility
- DDegaussing
Show answer & explanationAnswer & explanation
Correct answer: D. Degaussing
Degaussing uses a strong magnetic field to completely randomize the magnetic domains on a hard drive platter, rendering all data unrecoverable. This is generally considered one of the most effective methods for data destruction on magnetic media.
Why the other options are wrong
- A. Overwriting with zeros (or other patterns) can be effective but may not be as robust against advanced forensic techniques as degaussing.
- B. Low-level formatting resets the drive to factory settings but can still leave residual data recoverable with advanced tools.
- C. Secure erase utilities overwrite data multiple times, but degaussing is often more thorough for magnetic media.
Degaussing
The process of reducing or eliminating an unwanted magnetic field, used to destroy data on magnetic storage media.
- Uses a powerful magnetic field.
- Renders data unrecoverable on HDDs and tapes.
- Makes the drive unusable afterwards.
Memory trick: Destroy Data: Don't just delete, DEGAUSS!