Which of the following I/O devices is a block device?

Correct option is A

A block device is an I/O device that stores data in fixed-size blocks and allows data to be read or written in these blocks independently. A tape drive is a classic example of a block device because it processes data in sequential blocks.
Important Key Points:
1. Block devices store data in blocks and allow random access to blocks for reading or writing.
2. Tape drives are used for data backup and archiving, operating on block-based data storage.
3. They differ from character devices, which process data sequentially.
Knowledge Booster:
· USB port: A communication interface, not a storage device.
· Keyboard and Mouse: Input devices that send data in a character or stream format, not block-based.
· Modern block devices also include hard drives and solid-state drives (SSD).