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q benefit of digital versatile disk read only memorythe main benefit of having cav is that individual blocks of data can be accessed at semi-random
dvd-rom employs same principle as a cd-rom for reading and writing however a smaller wavelength laser beam is used total capacity of dvd-rom is 85gb
q main drawbacks of cd-romsthe main drawbacks of cd-roms are it is read only thus cant be updated access time is longer than that of magnetic disks
the main benefits of cd-roms are these are removable disks thus they are suitable for archival storage mass replication is cheap and fast large
q what is compact disk read only memorythis technology has evolved out of entertainment electronics market where cassette tapes and long playing
a disk drive with removable disks is known as removable drive a removable disk can be replaced by other similar disk on same or different computer so
q what is enhanced idethe principle behind eide interface is the same as in ide interface however this drive has capacities varying from 102gb to
q versions of small computer systems interface scsi-1 calls for a cable with 8 data wires plus one for parity scsi-2 allows use of multiple cables
q explain integrated disk electronics deviceside devices are associated to pc motherboard by a 34-wire ribbon cable common drive used today for
q what is hard drive interfacesecondary storage devices need a controller to proceed as an intermediary between device and rest of the computer
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