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Geometry.unmarshal computed cylinders = (y lsl 2) lor z, folding the sector bits (y bits 5-0) into the cylinder, so a cylinder reads back wrong (e.g. 700 as 764). Mask y to its high two bits first. The sector decode (y land 0x3f) is unchanged; LBA is unaffected.
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Geometry.unmarshalcomputedcylinders = (y lsl 2) lor z, folding the sector bits (ybits 5-0) into the cylinder, so a cylinder reads back wrong (e.g. 700 as 764). Maskyto its high two bits first. The sector decode (y land 0x3f) is unchanged; LBA is unaffected.