Is it better to keep data permanently on CD-ROM (hard disk) or traditional paper media?

At present, the development of information technology as the main storage mode has brought great progress to human society, making people more and more dependent on information resources. The preservation of data is becoming more and more important. After the American 9 1 1 disaster, countries all over the world pay more attention to network security and data storage. Human needs always lead the innovation and development of technology. Faced with how to ensure the safe storage of data, three-level data storage solutions have gradually formed: online storage, near-line storage and offline storage. The three storage methods have their own characteristics and are suitable for different applications and environments. At the same time, corresponding to each storage scheme, it produces its own storage products: disk array, optical disk library and tape library. 1. Disk Array is a storage device that uses disks as storage media. The advantage of disk is that it runs fast and supports many concurrent accesses, which is beneficial to real-time online applications. The disadvantage is poor performance and security. In order to solve the vulnerability problem, people use RAID technology to improve data security and mass storage requirements. Disk array is actually a solution to solve the redundancy of equipment. Due to the influence of price factors, at present, most manufacturers' products only deal with the redundancy of hard disk, power supply and fan, and a few optional RAID controllers are redundant, and less backplane and bus redundancy are provided. Moreover, due to the media characteristics of hard disk, it is impossible to guarantee the complete security of data, such as human misoperation, virus infection, hacker attack and so on. Therefore, for the sake of data security, the data backup strategy based on disk array is adopted. Once the data is damaged or lost, the data backed up on CD or tape can be restored to the online device. 2. The optical disk library is defined as a near-line storage device. At present, there are two kinds of optical storage media: DVD and MO magneto-optical disk. Optical disk storage uses laser to change the meson state of the disk to save data. Electromagnetic interference and temperature and humidity changes will not affect data storage. Moreover, the physical state of optical disc is the safest storage product at present, which determines that it is the safest data storage scheme among the three storage methods. CD-ROM can support data concurrent access and random reading and writing, but the reading and writing speed is lower than that of hard disk, but much higher than that of tape, so it is the media with the highest data security. Moreover, the unit storage cost of optical disk library decreases with the increase of data volume. CD-ROM is the best storage device for file management in various industries, which is characterized by a large amount of data, infrequent calls after storage and high requirements for data security. 3. Traditionally, large-capacity magnetic tape is used as backup storage of data. Because of the linear reading and writing characteristics of magnetic tape, it is almost impossible to read and write data directly from magnetic tape. When restoring the backed-up data, it needs to be returned to the data area before reading. Moreover, the storage of magnetic tapes is troublesome, and the requirements for the storage environment are relatively high, such as moisture-proof, dust-proof and electromagnetic interference prevention. In addition, the tape should be rewound regularly to avoid magnetic powder adhesion. Introduction to Plasma CD-ROM Library Plasma is an internationally renowned company specializing in the development and production of CD-ROM automatic storage devices, providing the industry with the most complete series of CD-ROM automatic storage devices, CD-ROM drives, CD-ROMs, network attached storage devices, tape libraries and CD-ROM library storage software; In 2000, it formed an alliance with Kodak Company and became a global strategic partner. During the rapid development of optical storage technology, Beijing Baolaitai Information Technology Co., Ltd. cooperated closely with Kodak's commercial imaging system department and American Plasma Company to launch the latest product series at the first time to meet the market demand: in 2002, it launched a single library with storage capacity of 580GB to 5.8TB, a new 14×9. 1GB drive and a highly reliable G series magneto-optical disk library. In 2003, single library with storage capacity of 78GB to 20.4TB, multifunctional optical drive (supporting DVD-RW, DVD-RAM, DVD-R, CD-R and CD-RW), patented plasma turntable (supporting 9.4GB double-sided optical disc), highly reliable D-series optical disc library and enterprise-level D-series optical disc library with extensible functions have been launched. The maximum capacity of enterprise D series is 2 175 slots, which is the largest disk library in the industry at present, and the maximum capacity of other manufacturers is 600 slots. The plasma CD library consists of a library body, a manipulator, a driver, a slot and a control part. At present, the DVD library has changed from 120 to 2 175. Double manipulators effectively improve the disk changing speed and save the disk changing time. The maximum number of drives is 12, which can work at the same time to meet the requirements of high load. Features of plasma CD library: plasma CD library is divided into D series, M series and G series. D-series optical disc library is a high-performance system, which adopts a patented dual-grasping manipulator and the disc changing time is as short as 3 seconds. M-series optical disc library supports MO erasable and WORM write-once optical discs; More than 40 pieces adopt double grasping mechanical arms; Support Netready module (NAS product) to provide direct Internet access for MO optical disk servers; The seal design simplifies daily maintenance. The G-series MO library adopts double-grasping mechanical arms, with an average time between failures of more than 3.8 million times, and the maximum data transmission rate of the drive is 6.14mb/s. Besides the characteristics of the M-series, the G-series CD library can also be bridged (when using 9. 1GB CD, the capacity can be from1.4tb ~ 20.

QQRead.com launched the data recovery guide tutorial data recovery guide tutorial data recovery fault analysis common data recovery scheme hard disk data recovery tutorial data protection method data recovery software professional data recovery service guide CD-ROM library application 1, near-line storage and data migration of computing center data. The so-called near-line storage is to provide real-time data storage equipment, which must be online at all times. The offline storage system does not need to provide real-time storage services, but only involves the storage of data at a certain moment, and the data stored in this device can be managed offline. The technical characteristics of optical disks determine that the optical disk library is the best near-line storage device. In recent years, due to the explosive growth of computer data information, almost all enterprises are facing the demand of massive data storage. It is a very professional technology to deploy a storage solution that can meet the enterprise's data storage needs indefinitely, because it needs to budget the daily storage growth of the enterprise, and also consider the scalability and availability of storage. The hierarchical storage governance technology of data migration came into being under such circumstances. The development of hierarchical storage governance technology has roughly gone through two courses. The first process is to use the most traditional manual method to migrate and schedule data. The specific methods are as follows: Migrate uncommon data to other storage devices according to a certain manual strategy, such as large-capacity tape libraries and optical disk libraries. This method is safe and reliable for professional network data management. However, when migrating data from offline devices (large-capacity tape libraries) back to online devices (hard disks), professional network administrators need to operate. The second stage is the intelligent tiered storage governance technology. This technology is one of the methods to realize large-capacity data storage in computer system. It takes the large-capacity near-line storage device (optical disk library) as the next-level device of the hard disk, and then automatically migrates the commonly used data in the hard disk to the secondary large-capacity storage devices such as optical disks according to the specified strategy. When these data are needed, the hierarchical storage system will automatically transfer these data from the secondary storage device back to the hard disk. For users, the above data migration operation is completely transparent. Users may feel that the speed of accessing the hard disk is a little slow, but they will obviously feel that the capacity of their logical hard disk has been greatly improved. Compared with the traditional data governance model, the advantages brought by this technical scheme are obvious. However, due to the limitation of linear reading and writing technology, traditional tape backup can only be used as a backup and storage of historical data. 2. File Management Data Storage (1) The current situation of file management is basically: low query efficiency, frequent query and high labor intensity. Archivists often go upstairs and downstairs when inquiring about documents and files, and some enterprise files may have several volumes and are very heavy. To prevent loss, please check the numbers before and after the reference. The security of the file cannot be guaranteed. Because of direct access to the original data, in order to prevent the inquirer from destroying or altering the original, a special person should be appointed to accompany him. Even if this happens, because there is no backup and there is no way to check, it will bear unnecessary losses. Filing is difficult. Due to the change of data (addition or update) and the simultaneous query of multiple volumes of related files, filing errors will inevitably occur. Once such a problem occurs, it is possible to rearrange hundreds of thousands of files, which involves a lot of manpower and material resources. Frequent filing causes employees to do a lot of physical work. Governance difficulties. Because the file is filed in the whole volume, sometimes only part of the content can be checked, but it is inevitable to read something that should not be checked, which is difficult to control. A large number of paper documents can only be manually indexed and registered, which cannot reflect the status of files, and there is a lack of a set of management system for file entry and exit records and file changes. (2) File management solution: Kodak high-speed scanner can scan 50 sheets per minute and 4000-5000 sheets per working day (in the case of unified paper), so that 1 scanner can basically meet the current incremental scale and future business development of 10 year; In addition, due to some unconventional documents and file modifications, it is necessary to configure a low-end color scanner. The image file size of each scanned original file is about 30KB, and the maximum storage capacity of a CD is 640 MB-9.4 GB. This system is mainly designed and developed to solve the problem of difficult storage and query after data concentration. The data storage capacity of the system no longer depends on the limitation of the local hard disk storage capacity of the server, but uses the data storage expansion technology of the optical disk library, a very mature mobile storage device in the industry, to realize mass storage and scalability of data. The benefits of investing in this system can be summarized as follows:

Reduce the storage time of documents between departments, save office space and manpower and material resources;

Branches can manage all kinds of documents in a unified way, which is convenient for centralized management and timely grasp the business situation;

Convenient to query and read documents. Usually, the query of a document only takes a few seconds or minutes, which saves time and effort.

Can provide safe backup, so that files can be based on accidents and insect bites;

It can greatly improve the quality of service to customers and establish a new customer-centered image.

(3) System function

Document scanning: use high-speed scanner to collect images of paper documents and generate digital electronic documents. At the same time, the collected archived image files are classified, compressed and checked for quality. Rescan unqualified image files.

Archive: The scanned archive image files are stored in different directories according to different categories.

File index: according to the different types of file image files, enter the index information of each image file.

Archive storage: storage planning, CD burning, CD library management, CD information maintenance, etc. Execute on the archived image file.

File maintenance: delete, modify and add electronic files.

Inquiry and access: internal inquiry of local area network, internet inquiry, fuzzy inquiry and document printing.

Security governance: user rights governance, file access rights governance.