Roadhog Harddrive replacement

Hi

After my recent slow booting and bluescreen with my Roadhog I am noticing on a quiet gig there is a what i can only describe as a "tone" coming from the harddrive. It lasts a minute or so and happens reqularly.

This is begining to concern me that failure is coming so can anyone tell me the type and spec of a drive I need to replace it.

MAny thanks

S
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