Memory Units

-


Memory Units
Memory is one of the most important components of a computer system as it stores data and instructions. Every memory chip contains thousands of memory locations. In the computer, the data is stored in the form of bits and bytes. A bit is the smallest storage unit of memory. A nibble is a collection of 4 bits. Eight bits combined together to form a single byte, which in turn represents a single character. The following table shows various units of computer memory.

Memory Unit
Relation with preceding Memory Unit
Equivalent bytes
Kilobyte (KB)
1 KB = 1024 Bytes (210 Bytes)
1024
Megabyte (MB)
1 MB =1024 KB (210 KB)
1024*1024
Gigabyte (GB)
1 GB =1024 MB (210 MB)
1024*1024*1024
Terabyte (TB)
1 TB = 1024 GB (210 GB)
1024*1024*1024*1024
Petabyte (PB)
1 PB = 1024 TB (210  TB)
1024*1024*1024*1024*1024
Exabyte (EB)
1 EB = 1024 PB (210 PB)
1024*1024*1024*1024*1024*1024
Zetabyte (ZB)
I ZB = 1024 EB (210 EB)
1024*1024*1024*1024*1024*1024*1024
Yottabyte (YB)
1 YB = 1024 ZB (210 ZB)
1024*1024*1024*1024*1024*1024*1024*1024

Comments

Post a Comment

Popular posts from this blog

ASCII / ISCII / UNICODE

-
Image
     Internal storage of encoding characters   A computer is capable of handling numeric data but in addition to numerical data, a          computer must be able to handle non-numerical information . In other words, a              computer should recognize codes that represent letters of the alphabet,                            punctuation and other special characters as well as numbers. These codes are            called alphanumeric codes. 1.      ASCII (American Standards Code for Information Interchange) ASCII code is most widely used alphanumeric code used in computers. It is used extensively in small computers, peripherals, instruments and communication devices. ASCII-7 can represent 2 7 =128 characters. ASCII-8 can represent 2 8 =256 characters. It is...
Read more

CISC / RISC / EPIC

-
Classification of Microprocessors 1.     CISC Processors: CISC is known as Complex Instruction Set Computer . The CISC approach attempts to minimize the number of instructions per program, sacrificing the number of cycles per instruction. Computers based on the CISC architecture are designed to decrease the memory cost . The number of instructions per program can be reduced by embedding the number of operations in a single instruction, thereby making the instructions more complex. For example, MUL(Multiply) . It performs operations such as load from memory, an arithmetic operation and a memory store all in single instruction. Example: IBM 370/168, Intel 80486 etc. Advantages: a.      Microprogramming is as easy as assembly language to implement and much less expensive than hardwiring a control circuit. b.      Fewer instructions are needed to implement a particular computing task, which led to lower memory...
Read more

Evolution of Computers

-
Image
Evolution of Computers The growth of computer industry started with the need for performing fast calculations. The manual method of computing was slow and prone to errors. So attempts were made to develop faster calculating devices. The journey that started from the first calculating device i.e. Abacus has led us today to extremely high speed calculating devices. Let us first have a look at some early calculating devices and then we will explore various generations of computer. Abacus Abacus was discovered by the Mesopotamia’s in around 3000 BC. An abacus consisted of beads on movable rods divided into two parts. (Fig-1) Addition and multiplication of numbers was done by using the place value of digits of the numbers and position of beads in an abacus. Fig. Abacus The Chinese further improved on the abacus so that calculations could be done more easily. Even today abacus is considered as an apt tool for young children to do calculations. In an abacus, each row is thought o...
Read more