Control method for magnetic disk device

Abstract

Abstract PURPOSE:To supply a power to each device simulataneously and to reduce power consumption by generating a delay signal different for each disk driving device, and driving a spindle motor with the delay signal. CONSTITUTION:A signal A of H level outputted from a power source-on detection circuit 13 is inputted to a delay circuit 14, and a signal B is outputted from the delay circuit 14 after the lapse of prescribed time required for the start-up of the spindle motor, and the signal B is inputted to a delay circuit 15, and a signal C is outputted from the delay circuit 15 after the lapse of the prescribed time. Also, the signal C is inputted to a delay circuit 16, and a signal D is outputted from the delay circuit 16 after the lapse of the prescribed time. The signals A-D are inputted to the gates on one sides of logical operation elements 17-20, and when a signal of H level is inputted to the gates on the other sides of the logical operation elements 17-20 selected with the contacts 11a-11d of a switch 11, a prescribed logical operation element is turned on, then, the spindle motor is started up. Therefore, it is possible to set different delay time on each disk driving device, respectively by selecting the contacts 11a-11d.

Inventors

• 👤 Tetsuro Murakami
• 👤 哲朗 村上

Bibliographic Details