CompTIA A+ Core 2 (220-1202)Operational ProceduresMedium
A technician is preparing to dispose of several old hard drives containing sensitive company data. Which data destruction method provides the MOST secure and irreversible erasure, making data recovery virtually impossible?
- ADegaussing
- BStandard delete
- COverwriting with zeros
- DQuick format
Show answer & explanationAnswer & explanation
Correct answer: A. Degaussing
Degaussing uses a strong magnetic field to completely scramble the magnetic domains on a hard drive's platters, rendering the data unrecoverable and the drive unusable. This is considered one of the most secure methods for irreversible data destruction.
Why the other options are wrong
- B. A standard delete operation simply marks space as available, leaving the data fully recoverable until overwritten.
- C. Overwriting with zeros (or random data) is a good software-based method, but sophisticated forensic techniques might still recover some data fragments, and it doesn't work for SSDs. Degaussing is generally more irreversible for HDDs.
- D. A quick format only removes the file system pointers, leaving the data largely intact and easily recoverable with forensic tools.
Degaussing
A data destruction method that uses a powerful magnetic field to erase data from magnetic storage media like hard drives.
- Irreversible data destruction for HDDs
- Renders drive unusable
- Uses strong magnetic field
Memory trick: Degaussing blasts data into oblivion.