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Data Destruction Methods

Degaussing

- Destroys data held on magnetic media such hard drives by subjecting it to a very strong magnetic pulse from a special machine.

- Clean and reasonably quick.

- Degaussed items remain physically intact for easy dismantling and recycling.

- Destruction operation requires tight management controls and specialist equipment to verify destruction of data due to lack of physical damage to item.

- Stronger magnetic pulses are used to destroy more highly classified data.

- Not suitable for certain items including mobile phones, CDs, USB sticks.

Physical Crushing

- Mechanically inflicted damage used for hard drive destruction. Damages the hard drive platter (spinning memory disk) and/or the drive mechanism.

- Reasonably quick.

More difficult to dismantle hard disks for recycling than with degaussing.

- Physical damage to hard drive is visible.

- Only really suitable for hard drives.

Shredding

- Heavy duty machinery which cuts or grinds items into strips or bits.

- Very quick once operating but heavy and expensive equipment to get in place.

- It is possible but difficult and costly to recycle the shredded mesh which emerges from the machine.

- Suitable for all types of media, memory devices and storage media.

- For more highly classified information residue particle size will be reduced.

 

Wiping or Erasing

- Specialist software application or hardware utility to overwrite hard drives and some mobile devices with binary data.

- Relatively time consuming and will not work on faulty drives/devices.

- Erased items can normally be reused meaning recycling isn't required.

- Suitable for use on newer hard drives and mobile devices that can be reused. Not suitable data for tapes, CDs etc

More on Data Erasure

The choice of data destruction method will depend on the sensitivity of data, the type of device on which is being stored, the physical location and the quantities involved. Please ask us for advice.

In many instances, more than one data destruction method will be used on the same item. For example, hard drives may be degaussed then crushed.

There are also a range of service options such as an inventory cataloguing service, serial number tracking for each item and WEEE recycling.

 

 

 

 

HMG Mandatory Requirement 45 Departments and Agencies must ensure that all media used for storing or processing protectively marked or otherwise sensitive information must be disposed of or sanitised in accordance with HMG IA Standard No.5 – Secure Sanitisation of Protectively Marked or Sensitive Information.

HMG Security Policy Framework V1.0 December 2008 (SPF 70)

 
 

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