Disk Management In Operating System

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 Disk Management  Disk is a secondary storage device that is used to store data.  The external devices such as hard disk, magnetic disks and floppy disks stores data in the sectors.  These devices provide the data to user programs by means of I/O requests.  Disk Management is an important function of operating system and includes disk buffering and management of swap area and disk cache.  Disk Structure  Disks provide a means to store a large amount of information for modern computer.  A disk is usually divided into tracks, cylinder and sectors.  Below fig shows the various components of a disk system.  Data is stored on a series of magnetic disks called platters. These disks are connected by a common spindle that spins at very high speed (some spindle rotate at speeds of 3600 revolutions per minute).  The two surfaces of a platter are covered with a magnetic material similar to that on a magnetic tape. Information is recorded mag...
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Networks an introduction

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Network and introduction

 DEFINITION:-

Two or more computers connected logically with the help of data communication devices and transmission media referred to as computer network. 

NETWORK COMPONENTS :-

The important components  used in the computer network are :

1 . media :- it is the medium through which the data travels. The various alternatives for transmission media are 

Twisted pair cable, coaxial cable, fibre optics, microwave satellite, cellular radio, trans receiver. 

2. Processes :- is the hardware which helps to transfer the data from source to destination. Different processor used in the data communication are :

Modems, multiplexer, concentrator, routers, bridges, gateway, front end processor, client and server computer's. 

3. Software:- To transfer the data from source to destination we require software. Various software are :

Communication software, network operating system software, SLIP, PPT, SMTP, MSN Internet Explorer, netscope navigator, middle Ware. 

4. Channels :- various channels used in data communication are 

Analog/digital, switched /non switched, circuit /message /packet switched, simplex /duplex /full duplex, synchronous /asynchronous. 

5. Topology :- it is way through which the data travels. The various topologies available for the communication are :

Point to point, multidrop, star, ring, mesh, bus, tree, etc. 

6. Architecture :- the various architecture available for computer networks are 

OSI, IEEE, ISDN, PSDN 


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