DIN 66399 Globally Standardized to ISO/IEC 21964

June 28, 2019 at 4:09 pm by Paul Falcone

The International Organization for Standardization (ISO) and the International Electrotechnical Commission (IEC), who together form the specialized system for worldwide standardization, have established a joint technical committee, ISO/IEC JTC, in the field of information technology. In August of 2018, ISO/IEC JTC internationally standardized the German Institute for Standardization’s DIN 66399 terms and principles for destruction of information technology data carriers. This standard, ISO/IEC 21964, is now being referenced by organizations on an international level when referring to data destruction requirements. The materials referred to in security levels are identical to those referenced in DIN 66399 and are as follows:

P — information in original size such as paper, film, and printing plates

F — information in miniaturized form such as microfilm and microfiche

O — information on optical data carriers such as CDs, DVDs, and Blu-ray Discs

T — information on magnetic data carriers such as floppy discs, ID cards, magnetic tape cassettes, mag stripe cards, and CAC IDs

H — information on hard drives with magnetic data carriers such as rotational hard drives

E — information on electronic data carriers such as memory sticks, RFID chip cards, solid state drives, and mobile communication equipment

P-7, shown above, is the standard for the destruction of classified material on paper

The ISO/IEC 21964 limits for particle sizes also have not changed from the DIN 66399 standard and remain as follows:

Paper Media

  • P-1: Particle size ≤ 2,000mmor strip width ≤ 12mm x unlimited strip length
  • P-2: Particle size ≤ 800mmor strip width ≤ 6mm x unlimited strip length
  • P-3: Particle size ≤ 320mm2or strip width ≤ 2mm x unlimited strip length
  • P-4: Particle size ≤ 160mmand for regular particles: strip width ≤ 6mm, such as our Model 5141P
  • P-5: Particle size ≤ 30mmand for regular particles: strip width ≤ 2mm
  • P-6: Particle size ≤ 10 mmand for regular particles: strip width ≤ 1mm
  • P-7: Particle size ≤ 5 mmand for regular particles: strip width ≤ 1mm or dissolved with particle size ≤ 5mmor shredded ash with particle size ≤ 5mm2 such as with our Model 244/4
NSA listed DVD shredder
O-6, shown above, is the standard for the destruction of classified material on DVDs and Blu-ray Discs.

Optical Media

  • O-1: Particle size ≤ 2,000mm2
  • O-2: Particle size ≤ 800mm2
  • O-3: Particle size ≤ 160mm2
  • O-4: Particle size ≤ 30mm2
  • O-5: Particle size ≤ 10mm2, such as with a Model 0202.
  • O-6: Particle size ≤ 5mmor shredded ash ≤ 5mmor melted compound, such as with a Model 0200 OMD/SSD with Cabinet Kit
  • O-7: Particle size ≤ 0.2mmor shredded ash ≤ 0.2mmor melted compound

Magnetic Media

  • T-1: Medium physically unusable
  • T-2: Medium broken into several parts and particle size ≤ 2,000mm2
  • T-3: Particle size ≤ 320mm2
  • T-4: Particle size ≤ 160mm2
  • T-5: Particle size ≤ 30mm2
  • T-6: Particle size ≤ 10mm2
  • T-7: Particle size ≤ 2.5mmor shredded ash ≤ 2.5mmor melted compound, such as a Model DS-400
H-3, shown above, is an approved method of destruction of classified material found on rotational hard drives, as long as the hard drive has been previously degaussed in an NSA listed degausser.

Hard Drive Media

  • H-1: Hard drive physically/electronically unusable
  • H-2: Data carrier damaged
  • H-3: Data carrier deformed, such as with a Model 0101 Crusher
  • H-4: Data carrier broken into several pieces and deformed and particle size ≤ 2,000mm2, such as with a Model 0305
  • H-5: Data carrier broken into several pieces and deformed and particle size ≤ 320mm2
  • H-6: Data carrier broken into several pieces and deformed and particle size ≤ 10mm2
  • H-7: Data carrier broken into several pieces and deformed and particle size ≤ 5mmor heated above Curie temperature
ssd shredder
A 2mm particle, shown above, falls under the E-5 category and is the standard for the destruction of classified material on solid state drives and devices.

Electronic Media

  • E-1: Medium physically/electronically unusable
  • E-2: Medium broken into pieces, such as with a Model 0101 with SSD Kit
  • E-3: Medium broken into pieces and particle size ≤ 160mm2, such as a Model 0304 Combo Shredder
  • E-4: Data carrier (chip) broken into pieces and particle size ≤ 30mm2, such as a Model 0205
  • E-5: Data carrier (chip) broken into several pieces and particle size ≤ 10mm2, such as a Model 2SSD
  • E-6: Data carrier (chip) broken into several pieces and particle size ≤ 1mmor shredded ash ≤ 1mm2
  • E-7: Data carrier (chip) broken into several pieces and particle size ≤ 0.5mmor shredded ash ≤ 0.5mm2, such as with a Model SSD1-HS

Film Media

  • F-1: Particle size ≤ 160mmwhere 10% of the material may exceed the specified particle size, but shall not be more than 480mmin size.
  • F-2: Particle size ≤ 30mmwhere 10% of the material may exceed the specified particle size, but shall not be more than 90mmin size.
  • F-3: Particle size ≤ 10mm2  where 10% of the material may exceed the specified particle size, but shall not be more than 30mmin size.
  • F-4: Particle size ≤ 2.5mmwhere 10% of the material may exceed the specified particle size, but shall not be more than 7.5mmin size.
  • F-5: Particle size ≤ 1,0 mmwhere 10% of the material may exceed the specified particle size, but shall not be more than 3.0mmin size.
  • F-6: Particle size ≤ 0.5mmor shredded ash ≤ 0.5mmwhere 10% of the material may exceed the specified particle size, but shall not be more than 1.5mm2in size.
  • F-7: Particle size ≤ 0.2mmor shredded ash ≤ 0.2mmor dissolved. The particle size shall not be exceeded.

For more information, please visit our DIN 66399 (ISO/IEC 21964) page here.

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