Research and arrangement of storage medium

1. Storage media (Storage Medium), also known as storage media, stores the physical vectors of binary information.

Main categories:

1. Semiconductor Memory: A semiconductor circuit as a storage medium memory.

Divided into random access memory (RAM) and read-only memory (ROM) by function

Divided into bipolar transistor memory and MOS transistor memory by manufacturing process

2. Magnetic surface Memory: the magnetic material coated on the carrier surface has two different magnetization states representing the binary states 0 and 1.

Tape storage: Sequentially accessed devices

Disk Memory: Main indicator storage density storage capacity access time data rate

3. Optical surface Memory

2. Common storage media in the market:

CF Card (conpact Flash); SanDisk first launched CFA members are entitled to free access to CF card CF trademark and CF technology details; CF Card is a solid-state product with Pcmcia-ata function and compatible with CF card flash memory technology does not require batteries to maintain stored data CF card as the world-wide storage industry standard, to ensure the compatibility of CF products, to ensure the backward compatibility of CF card; disadvantage: limited capacity and large performance limit; Most digital cameras choose CF as their preferred storage medium.

SM (Smart Media), Toshiba and Samsung set up the SSFDC forum for major manufacturers to promote SmartMedia as an industry standard; SM card itself has no control circuit and is made of plastic volume small very thin, because the SM card control circuit is integrated in the digital products ( such as digital cameras) This makes the compatibility of digital cameras easy to affect the new digital cameras are now available without the use of SM memory card products.

SD (Secure Digital memory Card) is a new generation of memory devices based on semiconductor flash memory; SD Card by Panasonic Toshiba and the United States SanDisk company jointly developed; With high memory capacity, fast data transfer rate, great mobility flexibility and good security connecting to a dedicated drive via the 9-pin interface interface does not require additional power to maintain the information on its memory and it is an integrated solid medium No moving parts do not worry about mechanical movement damage; The structure of SD card can ensure the security of digital file transfer and it is easy to reformat the multimedia files which have a wide range of application areas such as music movie news can be easily saved to SD card.

Memory stick very high compatibility and unprecedented "Universal storage media" (Universal media) concept for the future high-tech PC Videophone digital camera cameras and portable personal audio-visual equipment to provide a new generation of higher speed and larger capacity of digital information storage Exchange media; advantages: small size with very high stability and copyright protection features and easy to use in a variety of Memory Stick series of memory stick Advantage also lies in Sony launched a large number of products using the technology, such as DV camera digital camera Vaio PC color printer Walkman IC Recorder LCD TV and other PC Card converter 3.5-inch floppy disk converter line exit A wide range of accessories such as converters and USB readers make it easy for memory sticks to connect to PCs and Macs, and a number of companies such as Samsung AI Sanyo Casio Fujitsu Olympus, Inc. have expressed support for this format: they can only be used in Sony digital cameras and are not large enough.

Micro HDD

MMC (MultiMediaCard) Multimedia memory card

XD Card

SDHC (Hi capacity SD memory card) high capacity SD memory card

3. Security of storage media:

Avoid storage media corruption and information loss or theft security measures for storage media are as follows

1. Standardize the use of the operation, especially in the maintenance and scrap treatment to comply with regulatory requirements note the need to place the preservation environment attention to dust and moisture away from high temperature and strong magnetic field to avoid strong vibration of storage media

2. Authorization and recording of storage media and development of an unexpected disposition plan

3. Save in case of accidental damage according to manufacturer's standard

4. Establish a dedicated storage media Library The media stored in the Media Library should periodically check the shelf life of the storage media and store the data for long-term retention in the shelf life.

5. The misunderstanding of the secret-related data for example, the format of the hard drive after advanced format or file deletion just re-plans the storage area on the disk; Deleting a file only deletes the file's record table, even if the hard disk is re-partitioned, it only re-writes the partition information of the hard disk. , the hard disk can not read the data can not be recognized by the system or abnormal sound can not be formatted operation and other problems can not be explained that the data in the hard disk does not exist.

6. Safety hazards during the maintenance process such as a hard drive, especially the product shelf life of the new hard disk sent to foreign manufacturers to repair or not degaussing hard drive directly to the destruction of the place into the hands of the wrong person.

7. The safety of the scrap process, such as the replacement of the old hard drive has not been fixed by the demagnetization detection and identification of destruction rules and units do not have the corresponding technical process.

8. Storage media processing work establish and perfect rules and regulations to strengthen the professional quality of the confidential personnel safety and confidentiality awareness and sensitive data sensitivity and a high sense of responsibility periodically check the system security vulnerability of the confidential system patch the working state of the hard disk the system process has no malicious plug-in running the virus resides in memory.

4. Access control for storage media:

1. Set access rights for different roles and identify any access control and mandatory access control

2. Strengthen the management of regulations such as confidentiality measures

3. Management measures

Today, the instructor said that American IT companies have many Indo-American CEOs or senior engineers for one reason. Standardization of operating standards is not the pursuit of novelty and Maverick.

April 13, 2016 finishing

Research and arrangement of storage medium