Full definition
Each platter has 2 heads (one per face). A 4-platter HDD has 8 heads mounted on a single assembly (HSA, Head Stack Assembly). Heads contain two separate transducers: a GMR/TMR read sensor (magnetoresistive) and an inductive write coil. A 10nm flying height is equivalent to a Boeing 747 flying 5 millimeters above the ground: any particle or mechanical shock causes head crash. Head failure is the #1 cause of total HDD data loss. HSA swap requires a Class 100 cleanroom, an identical donor (same model, same firmware revision) and head-transplant equipment (Head Comb). Amateur attempts to open HDDs destroy platters within seconds.
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