Correct Answer: Correct answer is: (D) Magnetic bubble memory.
Exam Relevance: Computer Architecture, Digital Electronics, Computer Science Exams
Difficulty: Moderate
Concept notes: Magnetic bubble memory is a type of nonvolatile memory that uses magnetic domains to store data without any moving parts.
Common Mistakes: Students may confuse magnetic bubble memory with other types of magnetic storage like magnetic core memory or magnetic disk memory, which do not fit the criteria of having no moving parts.
Explanations: Magnetic bubble memory is a form of nonvolatile storage that uses magnetic domains, known as bubbles, to store data. These bubbles are moved around the memory medium using magnetic fields, but there are no mechanical moving parts involved in the storage process. This makes it distinct from other magnetic storage technologies like magnetic core memory or magnetic disk memory, which typically involve some form of mechanical movement. Therefore, magnetic bubble memory is the correct answer as it meets the criteria of being a nonvolatile direct access storage with no moving parts.
Option Analysis: - Option A: Magnetic core memory uses a grid of ferrite cores and wires to store data, which involves mechanical components and is not nonvolatile in the same way as magnetic bubble memory.
- Option B: Magnetic tape memory relies on a magnetic tape that moves past read/write heads, which involves moving parts.
- Option C: Magnetic disk memory uses rotating disks and moving read/write heads, which also involves moving parts.
- Option D: Magnetic bubble memory uses magnetic domains to store data without any moving parts, making it the correct answer.
Mnemonic: Bubbles float, no parts move.
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