Question small round red filter sticker on back of wd hard drive

manasan3010

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Nov 19, 2018
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There is a small red color sticker with a hole inside[ Bottom-Right on the picture]. What is the purpose of it? Is it essential for the function of drive?
(wd5000lpcx hard disk)
 

Eximo

Titan
Herald
My understanding on those is that they are a pressure equalization port. You don't want the drive to be completely sealed to the outside world.

With Helium filled drives it works a little differently I believe, but there is still a mechanism for keeping the pressure consistent.
 
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