Computer memory devices

Computer memory devices

& Information about CD, DVD, HD, BD

Done by: Yusuf Zayniev 106-group

Diagram of a computer device, two types of memory

Internal memory

External memory

CPU

Output device

Input device

Communication between a computer and the outside world

Means for storing operational information of its processing

Long-term storage of information

Arrows indicate directions of information exchange

Internal and external memory properties

• Internal memory
• The physical properties include the following:
• it is a memory built on electronic elements (microcircuits) that stores information only when power is available; for this reason, the internal memory can be called volatile;
• it's fast memory; the time of entering (writing) information into it and retrieving (reading) it is very small - microseconds;
• this memory is small in size (compared to external memory).
• Fast volatile internal memory is called random access memory, or RAM - random access memory.
• External memory
• external memory is non-volatile, that is, information is stored in it regardless of whether the computer is turned on or off, the medium is inserted into the computer or is lying on the table;
• external memory is slow compared to RAM; in order of increasing speed of reading / writing information, external memory devices are arranged as follows: magnetic tapes - magnetic disks - optical disks;
• the amount of information that fits in external memory is greater than in internal memory; and taking into account the possibility of changing media - unlimited.