The USB drive is a portable, easy-to-use and secure solution for transporting and sharing your daya. USB stand for Universal Serial Bus. Lightweight and compact, the USB drive is incredibly small and can fit right into your pocket, requries no cables, power supplies, or batteries. It plugs into any computer's USB port.
To make it work , plug the drive into a USB port on your computer. It is plug -and-play for new verson of operating system, but some operating system, such as Windows 95/98 do not automaticaly load the drive .
A single USB port can be used to 127 peripheral devices, such as mice, modems, and keyboards. There are various types of USB and length of drive , strong from 8 MG to more than 1 GB of data.
Written by chidananda M R on August 12th, 2007 with comments disabled.
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Magneto-Optical Disk
Magneto-Optical Disk SystemThe first removable 3.5 inch Magneto Optical (MO) disk drive was introduced by Fujitsu in 1992. The capacity of this MO disk was 128 MB. Today a MO disk can use store 2.3 GB data.The MO drive has become so popular because of its ease of use. You can use it for rewritng for any number of times. It is a reliable media for a long-term data storage extending to over 30 years. The MO disks can resist dust, magnetic fields. Ultra Violet rays and X-raya. The MO drives are used for transferring large volumes of data, as well as storing and archiving files in industres, such as publishing , stelecommunications, medical, and banking.
Strecture of Magneto-Optical Disk
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Microprocessor
The entire design of the PC is based on the microprocessor chip. The microprocessor can in data, perform a
rithmetic operation like addition, subtraction , division or are the data and the send out the result. It also performs comparison operation on data to check if they are equal, or if one is greater than the other.It also has the ability to perform logical operation on data. The microprocessor controls the activities of the various components of the computer and also responds to requests from the prepheral devices; for example, printer signals indicating that it as run out of paper.
The microprocessor consists of the Arithmetic-Logic init (ALU), The Control Unit and some special purpose storage areas called Registers. Using ALU, a microprocessor can perform mathematical operations like addition, subtraction,multiplication and division. Modern microprocessor contain floting point processors that can perform any complicated operations on large floting point number. During its ALU operations, the microprocessor holds its intermediate results in special purpose registers. These registers are storage areas, which are physically a part of the microprocessor chip. These are not accessible to the programmer, Other functions, a microprocessor can perform are:
It can move data from one location to another.
It can make decision and jump to a new set of instruction based on those decisions.
There are many types of microprocessor available in the market that are manufactured by different companies like intel.Advanced Micro Divices, Motorola, etc. The most widely-used are the range of Intel microprocessors in the family of the Intel processors are the Intel 8004, 8086, 8085, 8086, 8088, 80286, 80386, 80486 and the Pentium IV is most powerful microprocessor from Intel.
The capacity of a microprocessor is mesured in terms of the number of bits it can send or recive and the number of bits it can process intrnally. The 8088 is an 8/16 bit processor, indicatingthat it can send or receive 8 bits of data and internally process 16 bits of data at a time. The 80286 ts a 16/16 bit processor. Thus,it is a true 16 bit processor and is faster than the Intel 8088 chip. Also,the 80286 can work in two different modes; the real and the protected. When working in the real mode, the 80286 works just like the 8088. In the procted mode, the 80286 makes avilable many facilities that are not available on the 8088.For example, it provides features that allow more than one program or executed simultaneously. The protection feature prevents one program from tampering with any part of the memory that does not belong to it .
The 80386 chip has a 32-bit processing with a 32-bit data path and, as a result, is much faster than either the 8088 or the 80286 chip. Like the 80286, it can also work in protected mode.
The 80486 chip was introduced by intel in late 1989 and for the next for years, enjoyed the distinction of being the best performing midroprocessor in the Intel family. The Intel 80486, is a 32-bit processor. It has architectural enhancements, which make it perform better than the 80386 chip.
The Pentium is a 32-bit processor with a 32-bit data path, and was introduced in 1993. It is three times faster than the 80486.
The Pentium is a 32-bit processor with a 64-bit data path, and was introduced in 1997. It is three times faster than the Pentium.
The Pentium is a 32-bit processor with a 64-bit data path, and was introduced in 1999. It is two times faster than the Pentium.
The Pentium V is a 32-bit processor with a 64-bit data path, and was introduced in 2000. It is three times faster than the Pentium and is considered the best the Intel family.
Intel Pentium 4
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