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[skyworxx2000]

Theoretically, the drive works better with it's original calibration data. Thus meaning less/no read errors, faster seek time,... .
Usually it shouldn't matter if you keep your calib data or not, since it is very unlikely to get banned because of that. But it would definitely do no harm keeping the calib data if you plan to go live.
Some people report problems after they flashed their drive without calib data.

I would recommend keeping the calib data (thus meaning you have to make a full dump of your stock firmware using boxxdr or mra method)