How is the performance of a storage device measured?

Question

Options

• AMean time between failures
• BTotal bytes written q by
• CRead/write or seek speed
• Dper megabyte

• A
  94% (44)
• B
  2% (1)
• C
  4% (2)

Explanation

Note: There appears to be an error in this question's answer key. Option A (Mean time between failures, or MTBF) measures reliability - how long a device is expected to operate before failing - not performance. Accepting A as correct would be misleading to exam takers.

The technically correct answer is C: Read/write or seek speed. Storage performance is universally measured by how fast data can be read from or written to the device, and for spinning hard drives, seek time (how quickly the head finds data) is a key metric. These values (e.g., MB/s, IOPS) directly describe how fast a device performs.

Why the others are wrong:

• A (MTBF) - measures reliability/longevity, not speed or throughput
• B (Total bytes written) - measures endurance (relevant to SSD wear), not performance
• D (Per megabyte) - incomplete phrase; this describes a cost metric, not a performance metric

Memory tip: Think of "performance" like a car - you measure it in speed (mph), not how many miles before it breaks down (MTBF). Read/write speed = storage speed.

Recommendation: If this is from an official exam, double-check the source material. The intended answer may have been C and A was marked by mistake, or the question was poorly written.

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