Tashkent university of information technologies subject of operating systems

MINISTRY OF DEVELOPMENT OF INFORMATION TECHNOLOGIES AND COMMUNICATIONS OF THE REPUBLIC OF UZBEKISTAN

NAMED AFTER MUHAMMAD AL-KHOREZMIY
TASHKENT UNIVERSITY OF INFORMATION TECHNOLOGIES

subject of operating systems

INDEPENDENT WORK

Completed: SRM010 group student Kenjayev Abbos

by: Ruzibaev Ortiq Bakhtiyorovich

Tashkent - 2022

Topic : Memory card structure and working principle . (For this independent work I chose SD card)


Plan:

1. 
   Introduction
   
2. 
   The main part
   

1. 
   General view . SD card features .
   
2. 
   SD card structure . SD mode .
   
3. 
   SD card products . SD card specifications .
   
4. 
   Conclusion.
   
5. 
   References.
   

Keywords: CID, DSR, SCR, RSA, SCR, OCR
A memory device is a computer, a computer, and a part of a computer designed to record, store, and "return" information when the operator searches for it. Basically integral from chips consists of . Memory on the device information note in doing information carrier material ( perforated cards , perforated tapes) mechanical in a way push , magnetic materials ( magnetic disk , magnet lenta and others ) of magnet property change in dielectrics _ _ electrostatic charges to ` plash , sound and ultrasound vibrations use , o ` ta o ` conductivity incident application _ _ and other actions is done .
The memory device consists mainly of high-performance, operational, and external devices. Depending on the method of information retrieval, there are addressable (each memory slot is numbered and information is searched for a specific address) and associative (information is searched for a set of symptoms) memory devices. Memory devices are available in indelible (information on diode matrices, perforated tapes, etc.) and extinct (information on magnetic carriers, ferromagnetic cores, etc.) types. The basic unit of performance of a memory device is the capacity measured in bits or bytes (8 bits), ie the number of characters that can be stored in a memory device at one time.
The human brain is the most perfect Memory Device. It contains (10-15) about 109 nerve cells (cells) - neutrons, each of which forms a memory cell (cell).
The "brain" of a computer is the microprocessor, which retrieves data or programs from memory and records the results. The computer "reads" the data from the disk, stores it in a special partition, and uses it directly during the work. This special clothing is called RAM. The capabilities of a computer depend on the amount of RAM. If the computer has 1 MB or less of RAM, it can work only in the MS DOS OT environment, if it is 4 MB, in the MS DOS OT, Windows 3.1 environment, 32 MB and more, on the local network (Internet, Email) . Most computers have an additional RAM in the RAM. The most commonly used information is stored in this memory. The IBM PC also has BIOS (permanent memory) and CMOS (semi-permanent memory) types of memory. They store computer hardware scanning programs, operating system loading programs, and computer hardware maintenance programs. Thanks to the development of electronic technology and the effective use of bionic advances, it has been possible to create a memory device whose capacity is close to that of the human brain.

SD (Secure Digital) cards are a new generation of memory devices based on semiconductor flash memory. Due to its small size, data transfer speed, hot-swap and other great features, it is widely used in portable devices such as digital cameras, tablets and multimedia players.