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Consider a file currently consisting of 50 blocks. Assume that the file control block and the index block is already in memory. If a block is added at the end (and the block information to be added is stored in memory), then how many disk I/O operations are required for indexed (single-level) allocation strategy?
- a)1
- b)101
- c)27
- d)0
Correct answer is option 'A'. Can you explain this answer?
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Consider a file currently consisting of 50 blocks. Assume that the fil...
According to question file control block and the index block is already in memory. So, we don't need to transfer them from anywhere else for further operation. If a block is added at the end (and the block information to be added is stored in memory), this is a single operation. So we need only one I/O operation required for indexed (single-level) allocation strategy. So, option (A) is correct.
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Consider a file currently consisting of 50 blocks. Assume that the fil...
Indexed (Single-Level) Allocation Strategy
In indexed allocation, a separate index block is used to store the addresses of the data blocks. Each data block is assigned a unique index in the index block, allowing for direct access to the data blocks.
Given:
- File consists of 50 blocks
- File control block (FCB) and index block are already in memory
- A block is added at the end and the block information is stored in memory
Calculation:
To determine the number of disk I/O operations required, we need to consider the following:
1. Retrieve the index block from memory: 1 disk I/O operation
2. Update the index block with the address of the new data block: 1 disk I/O operation
3. Write the updated index block back to disk: 1 disk I/O operation
Since the index block is already in memory, we only need to perform disk I/O operations to update and write back the index block. The data block to be added is stored in memory, so no additional disk I/O operation is required to retrieve it.
Therefore, the total number of disk I/O operations required for indexed allocation in this scenario is 1 (to write the updated index block back to disk).
Answer:
The correct answer is option A) 1.
In indexed allocation, a separate index block is used to store the addresses of the data blocks. Each data block is assigned a unique index in the index block, allowing for direct access to the data blocks.
Given:
- File consists of 50 blocks
- File control block (FCB) and index block are already in memory
- A block is added at the end and the block information is stored in memory
Calculation:
To determine the number of disk I/O operations required, we need to consider the following:
1. Retrieve the index block from memory: 1 disk I/O operation
2. Update the index block with the address of the new data block: 1 disk I/O operation
3. Write the updated index block back to disk: 1 disk I/O operation
Since the index block is already in memory, we only need to perform disk I/O operations to update and write back the index block. The data block to be added is stored in memory, so no additional disk I/O operation is required to retrieve it.
Therefore, the total number of disk I/O operations required for indexed allocation in this scenario is 1 (to write the updated index block back to disk).
Answer:
The correct answer is option A) 1.
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Consider a file currently consisting of 50 blocks. Assume that the file control block and the index block is already in memory. If a block is added at the end (and the block information to be added is stored in memory), then how many disk I/O operations are required for indexed (single-level) allocation strategy?a)1b)101c)27d)0Correct answer is option 'A'. Can you explain this answer?
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