auto calibration in M8 family

irs

Member
hi guys,
i'd like to share something happened me about 1 week ago, i had to change heads on a M8E 1TB drive and i had no donors.
the only suitable was an M8 750GB same head map knowing they play with OD and ID more than density i changed heads and i got Grey Errors on all heads in calibration.

leaving it after a while and powering off and on the drive has started to calibrate and read, so i could image the drive, looks like the drive has a dynamic calibration process to update adaptive data, i saw this on some Toshiba drives also.
 
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