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Storage, Replay and Disposal of Digital Evidential Images Publication No. 53/07 In association with


Publication No. 53/07 i Storage, Replay and Disposal of Digital
Evidential Images Publication No. 53/07 1.0

ii Publication No. 53/07 Storage, Replay and Disposal of Digital Evidential Images Publication No. 53/07 1.0 FIRST PUBLISHED NOVEMBER 2007
© CROWN COPYRIGHT 2007 For information on copyright see our website http://science.homeoffice.gov.uk/hosdb/terms Home Office Scientific Development Branch
Sandridge St Albans AL HQ United Kingdom Telephone +44 (0)1727 865051 Fax +44 (0)1727 816233 Email hosdb@homeoffice.gsi.gov.uk Website http://science.homeoffice.gov.uk/hosdb/

Publication No. 53/07 1 Contents Introduction ............................................................................................................... 3 Scope ................................................................................................................ 3 Purpose ............................................................................................................. 3 Related documents ........................................................................................... 3 Types of archive ................................................................................................ 4 Overview ................................................................................................................... 6 New imaging applications ................................................................................. 6 Generic system outline. 7 System considerations. 10 Storage capacity requirements ....................................................................... 10 Reliability and availability ................................................................................ 11 Ease of retrieval .............................................................................................. 12 Managing metadata and indexing ................................................................... 12 Security ........................................................................................................... 13 Data migration and media longevity. 14 National versus local solutions. 14 Responsibilities ....................................................................................................... 16 The role of the IT department versus the Imaging department. 16 Requirements template. 18 Overview of the process. Appendix A:
Definitions........................................................................................................ Appendix B:
Calculation of storage volumes ....................................................................... 23
B.1
Introduction...................................................................................................... 23
B.2
Definition of factors. 23
B.3
Storage requirements relating to short-term retention .................................... 24
B.4
Storage requirements relating to long-term retention ..................................... 24
B.5
Example: Helmet cams ................................................................................... 25
B.5.1
Short-term storage year 1 .................................................................... 25
B.5.2
Short-term storage year 10 .................................................................. 25
B.5.3
Long-term storage year 10................................................................... Appendix C:
Future storage technology .............................................................................. Appendix D:
Museum versus migration ............................................................................... 32

Publication No. 53/07 Appendix E:
Media longevity issues.....................................................................................34
E.1
Longevity of physical storage media................................................................34
E.1.1
Optical media.........................................................................................34
E.1.2
Magnetic media .....................................................................................37
E.1.3
Hard disk drives .....................................................................................38
E.2
Storage, handling and testing ..........................................................................40
E.2.1
Optical disks...........................................................................................40
E.2.2
Magnetic tape ........................................................................................44
E.3
International standards on image permanence ...............................................45
E.3.1
Introduction ............................................................................................45
E.3.2
Traditional photographic media .............................................................45
E.3.3
Enclosures .............................................................................................46
E.3.4
Media for electronic storage Appendix F:
Requirements templates ..................................................................................48
F.1
Basic template..................................................................................................48
F.2
Advanced template ..........................................................................................50

Storage, Replay and Disposal of Digital Evidential Images Publication No. 53/07 3 Introduction


Types of archive
Option for master
The use of this medium for storage of master images is not preferred.
Generic system outline
Storage capacity requirements
Cpia as a minimum to cover appeal – typically length of sentence + 6 months.
Reliability and availability
Ease of retrieval
Managing metadata and indexing
National versus local solutions
The role of the it department versus the imaging
Imaging department
Overview of the process
Important note relating to appendices
B.1 introduction
Wis the fraction of the time that each camera is operating. r
B.5 example helmet
End yr 1 2 3 4 5 6 7 8 9 10
Network storage (
Hard disk drive (current technology)
Enhanced versatile disk
Solid state disk
E.1 longevity of physical storage media
E.1.1 optical
Factory pressed media
E.1.2 magnetic
E.1.3 hard disk drives
E.2 storage, handling and testing
Disk storage
Storage cases
Disk cleaning
Disk handling
Disk testing
E.2.2 magnetic
E.3 international standards on image permanence
E.3.2 traditional photographic media
E.3.3 enclosures
E.3.4 media for electronic storage
Digital imaging archive/storage requirements gathering



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