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Standard DoD 5220.22-M / NISPOM 8-306

US Department of Defense in the clearing and sanitizing standard DoD 5220.22-M recommends the approach "Overwrite all addressable locations with a character, its complement, then a random character and verify" (see table with comments) for clearing and sanitizing information on a writable media.

US Department of Defense 5220.22-M Clearing and Sanitization Matrix

 

Media

Clear

Sanitize

Magnetic Tape1

Type I

a or b

a, b, or m

Type II

a or b

b or m

Type III

a or b

m

Magnetic Disk

Bernoullis

a, b, or c

m

Floppies

a, b, or c

m

Non-Removable Rigid Disk

c

a, b, d , or m

Removabel Rigid Disk

a, b, or c

a, b, d , or m

Optical Disk

Read Many, Write Many

c

m

Read Only

 

m, n

Write Once, Read Many (Worm)

 

m, n

Memory

Dynamic Random Access memory (DRAM)

c or g

c, g, or m

Electronically Alterable PROM (EAPROM)

i

j or m

Electronically Erasabel PROM (EEPROM)

i

h or m

Erasable Programmable (ROM (EPROM)

k

l, then c, or m

Flash EPROM (FEPROM)

i

c then i, or m

Programmable ROM (PROM)

c

m

Magnetic Bubble Memory

c

a, b, c, or m

Magnetic Core Memory

c

a, b, e, or m

Magnetic Plated Wire

c

c and f, or m

Magnetic Resistive Memory

c

m

Nonvolatile RAM (NOVRAM)

c or g

c, g, or m

Read Only Memory ROM

 

m

Static Random Access Memory (SRAM)

c or g

c and f, g, or m

Equipment

Cahtode Ray Tube (CRT)

g

q

Printers

Impact

g

p then g

Laser

g

o then g
 

US Department of Defense 5220.22-M Clearing and Sanitization Matrix

a. Degauss with a Type I degausser

b. Degauss with a Type II degausser.

c. Overwrite all addressable locations with a single character.

d. Overwrite all addressable locations with a character, its complement, then a random character and verify. THIS METHOD IS NOT APPROVED FOR SANITIZING MEDIA THAT CONTAINS TOP SECRET INFORMATION.

e. Overwrite all addressable locations with a character, its complement, then a random character.

f. Each overwrite must reside in memory for a period longer than the classified data resided.

g. Remove all power to include battery power.

h. Overwrite all locations with a random pattern, all locations with binary zeros, all locations with binary ones.

i. Perform a full chip erase as per manufacturer's data sheets.

j. Perform i above, then c above, a total of three times.

k. Perform an ultraviolet erase according to manufacturer's recommendation.

l. Perform k above, but increase time by a factor of three.

m. Destroy - Disintegrate, incinerate, pulverize, shred, or melt.

n. Destruction required only if classified information is contained.

o. Run five pages of unclassified text (font test acceptable).

p. Ribbons must be destroyed. Platens must be cleaned.

q. Inspect and/or test screen surface for evidence of burned-in information. If present, the cathode ray tube must be destroyed.

For more information regarding clearing and sanitizing security standard DoD 5220.22-M see US Defence Security Service Web Site (Chapter 8).
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