Storage device and method in which write/read fault errors are not generated when mode is switched from power save mode or migration mode to ordinary mode

摘要

A storage device capable of avoiding write fault error or read error occurring immediately after switching from power save mode or migration mode to ordinary mode. By carrying out a dummy write/dummy read command when switching from power save mode for reducing electric power consumption or migration mode for reducing the time for which the electric current flows in magnetic heads, normal write command/read command is executed in a condition in which the magnetic heads are placed completely in on-track condition.