Overlay config core_freq turbo overclock_50 WRITE READ HDPARM 400 0 50.000 MHz 20.85 MB/s 21.91 MB/s 22.15 MB/s dtoverlay=sdtweak,overclock_50=100 400 0 100.000 MHz 22.89 MB/s 34.67 MB/s 34.58 MB/s RPi2にて Overlay config core_freq turbo overclock_50 WRITE READ HDPARM 250 0 50.000 ...