Editing Degaussing (section)

==Types of degaussers==
Degaussers range in size from small ones used in offices for erasing magnetic data storage devices to industrial-size degaussers for use on piping, ships, submarines, and other large-sized items, equipment to vehicles. Rating and categorizing degaussers depends on the strength of the magnetic field the degausser generates, the method of generating a magnetic field in the degausser, the type of operations the degausser is suitable for, the working rate of the degausser based on whether it is a high volume degausser or a low volume degausser, and mobility of the degausser among others.<ref name=dsi>{{cite web |title=Why Use a Degausser and Degausser FAQs |url=https://datasecurityinc.com/security/degausser.html |website=Data Security Inc |access-date=3 October 2021}}</ref> From these criteria of rating and categorization, there are thus electromagnetic degaussers, permanent magnet degaussers as the main types of degaussers.<ref>{{cite web |title=Secure deletion of data — comparison of degausser types |url=https://www.ontrack.com/en-ca/blog/degausser-types |website=Ontrack |access-date=3 October 2021}}</ref>

===Electromagnetic degaussers===
An electromagnetic degausser passes an electrical charge through a degaussing coil to generate a magnetic field.<ref name=dsi/> Sub-types of electromagnetic degaussers are several such as Rotating Coil Degaussers and Pulse Demagnetization Technology degaussers since the technologies used in the degaussers are often developed and patented by respective manufacturing companies such as Verity Systems and Maurer Magnetic among others, so that the degausser is suitable for its intended use.<ref>{{cite web |title=Maurer degaussing Method — Maurer Magnetic |url=https://maurermagnetic.com/en/demagnetizing/technology/maurer-degaussing-method/ |website=Maurer Magnetic |access-date=3 October 2021}}</ref><ref>{{cite web |title=What is a Degausser and How Does it Work for Data Deletion |url=https://securis.com/what-is-a-degausser-and-how-does-it-work/ |website=Securis |date=15 November 2016 |access-date=3 October 2021}}</ref> Electromagnetic degaussers generate strong magnetic fields, and have a high rate of work.

====Rotating coil degausser====
Performance of a degaussing machine is the major determinant of the effectiveness of degaussing magnetic data storage media. Effectiveness does not improve when the media passes through the same degaussing magnetic field more than once. Rotating the media by 90 degrees improves effectiveness of degaussing the media.<ref name=vs/>
One magnetic media degaussers’ manufacturer, Verity Systems, has used this principle in a rotating coil technique they developed. Their rotating coil degausser passes the magnetic data storage media being erased through a magnetic field generated using two coils in the degaussing machine with the media on a variable-speed conveyor belt. The two coils generating a magnetic field are rotating; with one coil positioned above the media and the other coil positioned below the media.<ref name=vs/>

====Pulse degaussing====
Pulse degaussing technology involves the cyclic application of electric current for a fraction of a second to the coil being used to generate a magnetic field in the degausser.<ref name=mmpd>{{cite web |title=Demagnetization — Basics and Know-how |url=http://maurermagnetic.com/en/demagnetizing/technology/demagnetisation-technology/#!/maurer-magnetic-pulse-demagnetisation |website=Maurer Magnetic |access-date=3 October 2021}}</ref> The process starts with the maximum voltage applied and held for only a fraction of a second to avoid overheating the coil, and then the voltages applied in subsequent seconds are reduced in sequence at varying differences until no current is applied to the coil. Pulse degaussing saves on energy costs, produces high magnetic field strength, is suitable for degaussing large assemblies, and is reliable due to zero-error degaussing achievement.<ref name=mmpd/>

===Permanent magnet degausser===
Permanent magnet degaussers use magnets made using rare earth materials. They do not require electricity for their operation. Permanent magnet degaussers require adequate shielding of the magnetic field they constantly have to prevent unintended degaussing. The need for shielding usually results in permanent magnet degaussers being bulky. When small-sized, permanent magnet degaussers are suited for use as mobile degaussers.<ref name=dsi/>