The standard built HDD reads / writes with about 100MB / s. The Samsung now with nice 500MB / s! See Photo. The conversion goes relatively fast (about 30 minutes) and is not particularly difficult. What I miss is for the Mac but the existing Windows Migration Assistant from Samsung. The restore over Time Machine / Migration has been a hassle ... All in all, now I am pleased with the great increase in speed - I can only recommend to anyone!