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q drawback of the system using disk cachingthe main drawback of the system using disk caching is risking loss of updated information in event of
q explain about disk caching schemethe disk caching scheme can be used to speed up performance of disk drive system a set cache of buffers is
q what do you mean by drive cachedisk cache may be a part of ram sometimes known as soft disk cache which is used to speed up access time on a disk
q describe the limitation of fat16dos designers decided to use clusters with as a minimum four sectors in them so a cluster size of at least 2kb for
q what is file allocation tablefat maps the usage of data space of disk it comprises information about space used by every individual file and unused
q what is high level formattingin any disk system the space at some time in use would become discarded and therefore will be free for other
q explain about fat - inodetoday modern pc comprises total capacity of nearly 40gb for storage of program and data due to this huge capacity in place
q what is disk access timethe disk access time has two key components seek time seek time is the time for disk arm to move heads to the cylinder
q physical characteristics and access mode of disk driveaccess time access time is time needed between requests made for a read or write operation
q what is access latency and rotation speedaccess latency a disk access basically moves the arm to selected cylinder and waits for rotational latency
q evaluate bandwidth of disk drivebandwidth bandwidth can be measured in bytes per second sustained bandwidth is the average data rate at the
q evaluate speed of disk drivedrive speed amount of information which can be transferred in or out of memory in a second is called as disk drive
q characteristics of magnetic disktracks and sectors disk is divided in concentric rings known as tracks thus a track is one complete rotation of
there are various limitations of primary memory like limited capacity which is its not enough to store a very large volume of data and volatility
external interface is interface between io interface and peripheral devices interface can be characterised into 2 main categories a parallel
q what is input-output processorslets briefly summarize the development in area of inputoutput functions these can be briefed as below1 cpu directly
q explain working of direct memory accessin both programmed io and interrupt-driven processor is busy with executing inputoutput instructions and io
q what is bus arbitrationin this technique io interface first needs to control bus and only after that it can request for an interrupt in this
q what do you mean by daisy chainthis scheme provides a hardware poll with this scheme an interrupt acknowledge line is chain by different interrupt
q what do you mean by software pollin this scheme on occurrence of an interrupt processor jumps to an interrupt service program or routine whose job
q what is multiple interrupt linesmultiple interrupt lines simplest solution to problems above is to provide multiple interrupt lines that will
q design issues related to interrupt-driven input - outputso interrupt handling includes interruption of currently executing program execution of
q interrupt - driven input-outputproblem with programmed io is that processor has to wait a long time for io interface to see whether a device is
q what is input - output instructionsan io instruction is stored in memory of computer and is fetched as well as executed by processor producing an
q determine why a new system is requiredfeasibility study - feasibility study is the method of defining the current problem determining why a new