| Term | Description |
| NCQ | NCQ (Native Command Queuing) is a hard disk drive technology that allows the individual disk to internally optimize the order in which received read/write commands are executed. This can reduce the amount of unnecessary drive head movement, improving performance and reducing drive wear. The technology is especially effective in worlkoads where multiple simultaneous read/write requests are outstanding, most often occuring in server-type applications. NCQ has been typically used in SCSI drives, and is currently making its way into some SATA drives. While NCQ typically improves disk performance in the presense of multiple read/write requests, historically it has also been argued that it may indroduce some latency to access of sequential reads/writes induced by NCQ logic. |