As a new type of information carrier and recording method, optical disc has a series of characteristics compared with information carriers such as paper, microfilm and magnetic disk. Because of these characteristics, the optical disc technology has shown unparalleled in terms of solving large-capacity information storage and fast random access, adapting to the needs of different forms of information storage and satisfying various requirements for information utilization. Advantage. In recent years, with the gradual expansion of the application scope and role of optical disc carriers, optical discs are undoubtedly a promotion and promotion of the modernization of file management. Therefore, the management of CD file management is the focus of file management.
The National Archives Industry Standards "Technical Requirements and Application Specifications for Electronic Document Filing Discs" (DA/T38-2008) have the following requirements and recommendations for the management and storage of archived discs:
1. Archive, save and use of archived discs
Incorrect ways to save, use, and maintain can compromise the performance of the disc and reduce the archiving life of the disc. The disc should be saved, used and maintained as follows.
1) Storage of archived discs
l The disc should be placed in the CD case and placed vertically in the CD holder for storage.
l Do not place the disc in an environment with high temperature, high humidity or rapid changes in temperature and humidity. Do not expose the disc to sunlight or ultraviolet light for a long time.
l The disc should be placed away from dirt or foreign objects.
2) Use of archived discs
l Remove the plastic package from the spindle box or the jewel case before preparing to burn the disc. Do not open the disc package when you are not ready to burn the disc.
l CD-R and DVD±R, BD-R use dedicated recorder and optical drive (or player) respectively, it is forbidden to use the recorder to read the disc.
l Hold the disc with the two fingers and pinch the center hole and outer edge of the disc. Do not bend the disc by hand.
l Use a soft label pen with non-solvent-based ink to write the disc label on the label side of the disc. It is forbidden to write a label on the label side of the disc with a hard pen, and it is forbidden to write the label in the data area of ​​the laser readout surface of the disc.
l Put the disc back into the disc case immediately after use.
3) Maintenance of archived discs
l Wipe the disc to remove dust, foreign matter, stains, fingerprints and liquid from the disc. Wipe it from the center of the disc to the outer edge of the disc with a clean cotton cloth. Do not wipe the disc in the circumferential direction of the disc.
l Clean the disc with grade 3 water. For difficult to clean, use diluted isopropanol. Wipe and dry with a lint-free cloth or mirror paper.
2. Archive the environmental conditions for CD storage, work and inspection
1) The archived disc shall be stored, operated and tested under the conditions of temperature, humidity and atmospheric pressure as specified in Table 1.
Table 1 Temperature and Humidity and Atmospheric Pressure Conditions for Archived CD Storage, Operation and Detection
temperature
Temperature gradient
Relative humidity
Humidity gradient
Atmospheric pressure
Save environment
4～20°C
15 ° C / hour
20% to 50%
10% / hour
75 to 106 kPa
working environment
15～35°C
10 ° C / hour
45% to 70%
10% / hour
75 to 106 kPa
Testing environment
23±2°C
45% to 50%
96 ± 10 kPa
2) Light exposure to the recording layer of the disc should be minimized or avoided during the storage, operation and inspection of the disc.
3) The indoor illumination of the archive is not less than 50lx (0.25m from the ground), and the studio illumination is not less than 200lx (0.75m from the ground). The ultraviolet light intensity is not more than 75 mw/lm. The illumination source should use an energy-saving cold light source that does not contain ultraviolet light.
4) See Table 2 for the requirements for Archived CDs to store harmful gases and particulate matter in the environment.
Table 2 Requirements for Archived Discs to Store Hazardous Gases and Particulate Matter in the Environment
Hazardous species
allowance
Unit
Sulfur dioxide (SO2)
≤10
10-9 (volume fraction)
Nitrogen oxides (NOX)
≤10
10-9 (volume fraction)
Ozone (O3)
≤10
10-9 (volume fraction)
Acetic acid (CH3COOH)
< 4
10-9 (volume fraction)
Formaldehyde (HCHO)
< 4
10-9 (volume fraction)
particulates
≤ 50
Mg/m3
5) Keep the environment away from strong magnetic fields, strong heat sources and harmful gas sources.
In addition, regular inspections and maintenance are also required. Due to the variety of discs and the lifespan, it is necessary to regularly check the collection of CD-ROM files on a regular basis to grasp the appropriate timing for the migration of CD-ROM file information. Establish corresponding maintenance management files, record the operation process of inspection, maintenance, copying and migration of CD files to avoid human error or unnecessary duplication of work. The storage of CD-ROM files must strengthen daily management, improve the system, implement responsibilities, carry out CD-ROM file technology education and training, improve the quality of staff and avoid incorrect operation.
For the archives department, the data on each archived disc must be archived for a long period of time, which requires 100% reliability. Therefore, pre-archive inspection of archived discs is very important, and it is a specific guarantee for the reliability of archiving discs in the archives department. According to DA/T38-2008: When an electronic file is archived on a disc, the disc should be tested. The error rate and uncorrectable error of the disc must be checked before archiving, and the qualified ones can be archived. Discs that fail to pass the test must be scrapped. Can be archived after re-burning and testing. According to DA/T38-2008, the Tsinghua Tongfang archived optical detector is verified by the standard test disc. The product adopts professional-grade Blu-ray disc detection driver and is equipped with computer platform, which is easy to operate and convenient to use. Can support CD-R, DVD-R, BD-R three types of discs, its main functions include pre-record detection, pre-archive detection, post-archive detection. The disc detector series currently has desktop desktop and portable, and can also be matched according to different needs to meet the needs of different users in different industries.
In short, the management of CD-ROM files is an innovation for file management work, which is the life cycle and continuous development of files. In the process of keeping and maintaining CD files, the environment, equipment, technology and characteristics of CD-ROM files should be fully considered to formulate technical solutions and working modes, and effective measures should be taken to ensure the security and reliability of CD-ROM files. Being in an accurate state of utilization makes it play a greater role in social life. At the same time, archivists should take the initiative to understand the development of archives and reading equipment at home and abroad, and timely dump and update digital archives according to work needs and new carriers and new equipment features, so that the protection of digital archives is continuously improved.
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