Question Coercitivy and metal cover

[gamer87]

IS myth or true HDD 2.5" hás low Platters Coercitivy or Platters high coercivity?
What coercivity of old models WD10JPVX-08JC3T5, HGST HTS541010A99E662? High coercivity any benefícit?

What is the function of the metal top cover on 2.5" HDDs? Do all models, regardless of brand, even older ones, have a metal top cover?

[cat0w]

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[Vegan]

Coercivity is a measure of how easy it is for a disk to write data, retentivity is a measure of how reliable the platters are