its BN 104

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Table of Contents
1.    Primary and secondary storage    3
2.    Device handler seek strategies    4
3.    File management and deadlock in operating systems    5
4.    UNIX commands and their uses    6
5.    References:    7
1. Primary and secondary storage
The storage place of computer where data and information is actually stored is known as memory. So, the storage part of any computer system is basically referred as memory. All the processing’s of different programs, collected data and processed information is stored in memory. The memory of any computer system can be permanent or it can be temporarily. The desired data stored on memory can easily be retrieved for future uses.
Memory
(
Secondary memory

memory
) (
Primary memory
)
(
Pen drive
Hard disk,
DVD
) (
ROM
) (
RAM
)
(
PROM
EPROM
EEPROM
) (
SRAM, DRAM
)
So, from above diagram, it is clear that the memories are of basically two types [1]. The table to show the difference in them with suitable examples is provided below:
    Sr. No.
    Primary memory
    Secondary memory
    1.
    It is temporary memory which is directly accessed by the CPU or processor.
    It is permanent memory so, CPU or processor is not allowed to make direct access.
    2.
    It can be volatile or non volatile.
    It is always volatile.
    3.
    It is expensive memory because of semiconductors.
    It is cheap memory because of magnetic tapes.
    4.
    It is the main memory which includes registers, cache, RAM and ROM.
    It is auxiliary memory which includes hard disks, DVD, pen drives etc.
2. Device handler seek strategies
The predetermined policy used by device handlers for making access and allocation of devices to waiting and currently executing processes is known as seek strategy of device handlers. The order of accessing any required device by any process is being determined by these policies. Maintaining minimum time...