On Sat, 28 Nov 2015, Fred Cisin wrote:
If other errors occur, such as "requested sector header not found", they may be misinterpreted by the drive

that's "misinterpreted by CONTROLLER"
although some of the fancier newer drives can also have a problem



So, . . .
WD style: no problem with index pulse timing relative to data
NEC765 style: index pulse is necessary during LLF, but may need to be blocked during read/write, although a few of the newest drives may not be happy without index.

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