PLEASE ANSWER IN DETAIL FULL PARAGPRAH ANSWERS EXPLAIN File management directly

Question

PLEASE ANSWER IN DETAIL FULL PARAGPRAH ANSWERS EXPLAIN

File management directly influences how applications access data in the secondary memory and [mounted] devices. File systems aim at transparently abstracting the underneath complexities and diversity of drivers, controllers, and devices, targeting performance, consistency, and reliability. [4] (i) What are the criteria for defining the file organization strategies?
[6] (ii) List and explain the five fundamental file organization schemes.
[6] (iii) In File Management, file records are grouped into blocks, which then refer to physical blocks, either in main memory (buffered) or secondary memory. Difference schemes, Fixed Blocking, Variable Blocking Spanned, and Variable Blocking Unspanned, are major strategies for organizing file records. Describe in detail each of these three methods, providing their advantages and disadvantages.
[4] (iv) What are the three methods for File Allocation? Explain each

Explanation / Answer

i) Criteria for defining the file organization strategies

(ii) Five fundamental file organization schemes

(iii)

In File Management, file records are grouped into blocks, which then refer to physical blocks, either in main memory (buffered) or secondary memory. Difference schemes, Fixed Blocking, Variable Blocking Spanned, and Variable Blocking Unspanned, are major strategies for organizing file records.

(iv) Operating System is responsible for allocating blocks to files.

Allocation strategies are

File Allocation Methods are

1) Contiguos File Allocation:

A single contiguous set of blocks is allocated to a file at the time of file creation. the allocation details is updated in File allocation table (FAT). It is a data structure used to keep track of the portions assigned to a file.

2)Chained Allocation
In chained allocation, allocation is on an individual block basis. Each block contains a pointer to the next block in the chain. The file allocation table needs just a single entry for each file

3)Indexed Allocation

In indexed allocation scheme, a block known as the Index block contains the pointers to all the blocks occupied by a file. Each file has its own index block.

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