sealed unit

British  

noun

1. a hard disk that is permanently sealed to prevent damage to the read/write head See also Winchester disk

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Example Sentences

But here's the thing: Because each coddled egg is a self-contained, sealed unit, you can cook said egg with any number of toppings and add-ins.

From Salon

It was a sealed unit so she couldn’t replace the battery.

From Washington Post

"This seems to confirm that 'ampoulization' is not canisterization but akin to the Soviet/Russian practice of preloading submarine-launched ballistic missiles with propellants at the factory and maintaining the fuelled missile as a sealed unit for loading into the launcher," 38 North concluded in a report on Friday.

From Reuters

One option is to fit double or triple glazing - windows with two or more glass panes in a sealed unit.

From BBC

It has been air-dried to reduce the smell and will be displayed in a sealed unit.

From Seattle Times