ROTATIONAL LATENCY Meaning and
Definition
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Rotational latency refers to the delay or time lag in data retrieval from a storage device that utilizes rotating components, such as a hard disk drive (HDD). It specifically measures the time it takes for the target sector of a rotating disk to be positioned under the read/write head before data can be accessed.
In a HDD, data is stored on circular platters which rotate at a set speed, typically measured in revolutions per minute (RPM). To retrieve or write data, the read/write head is positioned over the corresponding sector on the rotating disk. However, due to the continuous spinning of the disk, there is a finite time required for the disk to rotate the target sector under the head.
Rotational latency is determined by the angular displacement of the rotating disk and the rotational speed of the drive. It is commonly calculated by dividing the time required for one full revolution of the disk by two, giving half the rotational time. This latency is typically measured in milliseconds.
Reducing rotational latency is crucial for improving the performance of disk-based storage systems. It directly affects the access time or seek time, which is the time taken to locate and retrieve the requested data. Lower latency translates into faster data retrieval, which in turn improves the overall efficiency of systems relying on disk-based storage.
Solid-state drives (SSDs), unlike HDDs, do not rely on rotating disks and thus have no rotational latency. They offer significantly faster access times and are increasingly preferred over HDDs for their superior performance.
Common Misspellings for ROTATIONAL LATENCY
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Etymology of ROTATIONAL LATENCY
The word "rotational latency" does not have a specific etymology as it is a combination of two commonly used terms: "rotation" and "latency".
1. Rotation: Derived from the Latin word "rotatus", meaning "turned around" or "revolved", which in turn comes from the verb "rotare", meaning "to turn". It refers to the action of turning or spinning around an axis.
2. Latency: Originating from the Latin word "latens", meaning "hidden" or "concealed". It signifies the delay or the time taken for something to happen or respond.
Combining these two terms, "rotational latency" simply refers to the time delay or latency associated with the rotation of an object, often used in reference to computer hard drives or mechanical systems.
Similar spelling word for ROTATIONAL LATENCY
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