Complex sentence: Microdrive was a registered trademark for miniature, 1-inch hard disks produced by IBM and Hitachi designed to fit in CompactFlash (CF) Type II slots.
Split into simpler sentences: Microdrive was a registered trademark for miniature, 1-inch hard disks produced by IBM and Hitachi. These rotational media storage devices were designed to fit in CompactFlash (CF) Type II slots.