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A Guide to Understanding Data Remanence in Automated Information
Systems
Table of Contents
FOREWORD
ACKNOWLEDGMENTS
1 INTRODUCTION
1.1 PURPOSE
1.2 HISTORY
2 GENERAL INFORMATION
2.1 USE OF THIS GUIDELINE
2.2 IMPORTANT DEFINITIONS
2.3 OBJECT REUSE AND DATA REMANENCE
3 DEGAUSSERS
3.1 A PRIMER
3.2 DEGAUSSER TESTING
3.3 LABELING TAPES
3.4 DEGAUSSER PRODUCTS LIST (DPL)
3.5 DEGAUSSING EQUIPMENT FAILURE
4 RISK CONSIDERATIONS
4.1 DESTINATION OF RELEASED MEDIA
4.2 EFFECTS OF HEAT AND AGE
4.3 MECHANICAL STORAGE DEVICE EQUIPMENT FAILURE
4.4 STORAGE DEVICE SEGMENTS NOT RECEPTIVE TO OVERWRITE
4.5 OVERWRITE SOFTWARE AND CLEARING
4.6 OVERWRITE SOFTWARE AND PURGING
4.7 CONTRACTUAL OBLIGATION
4.8 MAINTENANCE
4.9 DATA SENSITIVITY
4.10 DEGAUSSING
5 STANDARDS
5.1 GENERIC PROCEDURES
5.1.1 OVERWRITING
5.1.2 DEGAUSSING
5.1.3 DESTRUCTION
5.2 SPECIFIC PROCEDURES
5.2.1 MAGNETIC TAPES
5.2.2 MAGNETIC HARD DISKS
5.2.3 MAGNETIC DRUMS
5.2.4 MAGNETIC FLOPPY DISKS AND CARDS
5.2.5 MAGNETIC CORE MEMORY
5.2.6 PLATED WIRE MEMORY
5.2.7 THIN FILM MEMORY
5.2.8 MAGNETIC BUBBLE MEMORY
5.2.9 RANDOM ACCESS MEMORY (RAM)
5.2.10 READ ONLY MEMORY (ROM)
5.2.11 ERASABLE PROGRAMMABLE READ ONLY MEMORY (UVPROM)
5.2.12 ELECTRICALLY ERASABLE READ ONLY MEMORY (EEPROM)
6 OTHER STORAGE AND OVERWRITE TECHNOLOGY
6.1 OPTICAL DISKS
6.2 FERROMAGNETIC RAM
6.3 DISK EXERCISERS
7 FUTURE DIRECTIONS
GLOSSARY
REFERENCES
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