HDD case material?

[Jamie^]

Is there any reason that all HDD's are in some form of metalic? and why you are not able to buy plexisglass box's to replace the metalic standard ones?

Thanks if you know.

 

[Jamie^]

Didn't realise they was constructed under such conditions. Would running it, in your opinion, with the top half of the encasing off, destroy the HDD? Kinda tempted to but one for a display case i was going to attempt but if it's just to die on me, no point.