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Audio tapes with varying amounts of head cleaning agent (HCA), pigment volume concentration (PVC) and lubricant concentration were run against a mu-metal audio head in a linear tape drive. Surfaces were characterized with atomic force microscope (AFM). Head wear was measured using a Knoop indentation technique in which the change in the length of the indent diagonal corresponds to the wear depth....
Thin, adherent head deposits called @'stains@' have been encountered intermittently over the past three decades. These deposits are not the same as common, readily removable tape debris. Stains are sometimes transparent but usually have an intrinsic blue or brown coloring. Coverage of the head surface varies from spotty to continuous with thicknesses ranging from 10-30 nm. Stains are generally insoluble...
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