To create a RAID 5 configuration, a minimum of three drives is required.

In RAID 5, data is striped across multiple drives with parity information distributed among the drives. This provides fault tolerance, as the parity information allows for the reconstruction of data in case of a drive failure. Each drive in the RAID 5 array stores both data and parity information.

To ensure redundancy and fault tolerance, RAID 5 requires at least three drives. This way, if one drive fails, the data can still be reconstructed using the parity information on the remaining drives.

Therefore, the correct answer is B) 3.

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To answer this question, let's break down the statement and go through each option:

The statement is: "Though in NAS, we have file level data access, file blocks can be accessed by application."

Option A) True - This option is incorrect because in Network Attached Storage (NAS), file blocks cannot be accessed directly by applications. NAS provides file-level access, which means that applications can access files as a whole, but they do not have direct access to individual file blocks.

Option B) False - This option is correct because it accurately states that file blocks cannot be accessed by applications in NAS. Applications can only access files at the file level, not at the block level.

The correct answer is B) False.

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To answer this question, we need to understand the different types of data transfer modes in SCSI (Small Computer System Interface).

Fast SCSI refers to the implementation of the SCSI protocol that allows for higher data transfer rates. One of the key features of Fast SCSI is the use of synchronous data transfer.

Option A) Asynchronous Data Transfer - This option is incorrect because Fast SCSI does not use asynchronous data transfer. Asynchronous data transfer mode allows for variable data transfer rates and is typically used in slower SCSI implementations.

Option B) Synchronous Data Transfer - This option is correct because Fast SCSI uses synchronous data transfer. Synchronous data transfer mode allows for a fixed data transfer rate, which helps to achieve higher transfer speeds in Fast SCSI.

Option C) Semi-synchronous Data Transfer - This option is incorrect because Fast SCSI does not use semi-synchronous data transfer. Semi-synchronous data transfer is not a standard data transfer mode in SCSI.

Option D) None of the Above - This option is incorrect because Fast SCSI does use synchronous data transfer.

The correct answer is B) Synchronous Data Transfer. This option is correct because Fast SCSI uses synchronous data transfer to achieve higher data transfer rates.

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