What Does Degauss Mean to Hard Drive Destruction?
- Computer hard drives use magnetic fields to store data on special discs called platters.
- Degaussing is the elimination of magnetic field patterns.
- A degausser of the appropriate strength will eliminate the magnetic fields on the hard drive platters thereby eliminating all data.
- The magnetic field generated by a deguasser destroys all data on the drive in approximately 1/10th of a second regardless of whether the drive is functioning or non-functioning
- After degausssing, the data on a hard drive is forensically irrecoverable, the data simply no longer exists, leaving your media safe for recycling or disposal
- Degaussing is recognized by the NSA and DoD as an appropriate method of secure data destruction
How Does a Degausser Work?
Degaussers, like the Garner TS-1 NSA listed degausser, erase data by generating a powerful magnetic field that permanently remove the magnetic properties on the disk platters or tape thereby erasing or randomizing the recorded data patterns.
Overwriting is a method where a random pattern of usually “1” and “0” is written to every part of the drive, frequently three times, to obliterate the underlying data. The advantage of this method is the drive can be re-used. However, there are several disadvantages with Overwriting:
- Only adds layers to existing data, the underlying data still remains and is susceptible to forensic recovery
- Requires a skilled operator to ensure the overwriting is done correctly
- Non-functioning sectors of the hard drive cannot be overwritten allowing data to remain on the drive
- Because Overwriting is not regarded as fail-safe, it is not permitted for the highest data security standards such as the NSA or DoD
- Nearly five times the cost of degaussing because it requires a considerable amount of time (hours) and electricity
Drilling holes, hitting with a hammer, running over with a truck etc. will not get rid of data. It will only make the data more difficult to recover. Check out www.drivesavers.com website and see the data they have recovered. Very enlightening.
Physical destruction of hard drives by shredding, bending, and breaking the hard drive and its internal components, prevents the hard drive from “spinning up” or the hard disk platters from being removed and placed on a spin stand used in laboratory data recovery techniques. It is important to recognize, physical destruction damages the media but the data is still present. An 1″ hard drive fragment can contain up to 125 GB of data or 312 pallets of typed paper. Best practices dictate the hard drive first be degaussed before it is physically destroyed.