Why do hard drives have labels asking you not to cover holes?

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Why do hard drives have labels asking you not to cover holes?

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Anonymous 0 Comments

Per Google:

Hard disk drives require a certain range of air pressures in order to operate properly. The connection to the external environment and pressure occurs through a small hole in the enclosure (about 0.5 mm in breadth), usually with a filter on the inside (the breather filter).

Anonymous 0 Comments

The hard drive is nearly completely airtight for the tiny breather hole which is filtered to prevent any dust from getting in as pretty much any contamination wrecks the drive.

If you cover the hole that makes it completely airtight. And then if the air pressure changes during shipping, or even locally from weather the case inflated or deflates slightly like a balloon. That deformation can also wreck the drive.

Though there are completely sealed drives like the helium filled ones built to handle pressure changes though.