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Looking for SAS Hard Drives, I found to drives different in only one point (as it seems to me): One has the letters "NHP" in its product name, the other one doesn't. What does it mean?

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up vote 4 down vote accepted

Non Hot-Plug, not designed for removal and replacement whilst the system is still running.

Business servers (other than entry-level SME servers) generally are specified with Hot-Plug drives to reduce server down-time.

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