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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Network hardware in computer network

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 Network Hardware 

Network Hardware is the physical equipments needed to perform the data processing and communication within the network. 

It connects the different computer peripherals among a group of users, network Hardware, NICs (Network Interface Cards), hubs, switches, cables, routers modem, ISDN adaptors etc. 

Some of the common Network devices are :


1. Hub:-

It connects the multiple ethernet segment together making to act a segment. 

A hub is used to join number of Input lines. Data coming from to Input line is transmitted to all other line. When using a hub, every attached devices share the common broadcast domain. Hence only one computer connected to hub is able to transmit at a time. 

Depending on the network topology, the hub provides the basic livel I OSI model connection among the network objects. 

Hub are multiple port repeaters, and such they obey the same rule as repeaters. 

They operate at OSI model physical layer. 

Hub organizes the cables and relays singal to the other media segment. 



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