Key performance characteristics of hard disk drives include sustained data rate and input/output operations per second (IOPS). The sustained data rate is crucial for evaluating HDD performance, especially during sequential operations, with figures indicating that a 5,400 RPM HDD can reach rates of 170MBps to 180MBps at the outer edge. However, IOPS are slower because of mechanical seeking, impacting agility. HDD performance also depends on rotational speed and data density, with significant declines in data rate as one accesses inner tracks.
The sustained data rate is the most important characteristic of hard disk drives, determining their suitability for sequential operations, which rank and benchmark HDDs accordingly.
HDDs typically perform slower in IOPS due to mechanical seeking, making that metric less reproducible, though it remains crucial for assessing HDD agility.
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