公开(公告)号：JPH07281840A

公开(公告)日：1995-10-27

申请号：JP7621394

申请日：1994-04-14

Applicant: IBM JAPAN

Inventor： TSURUMI MAKOTO ,  IWASA HIROYUKI ,  YAMIYA HIROAKI ,  TAKESHITA TERU

IPC: G06F3/06 ,  G06F11/00 ,  G06F11/20 ,  G11B20/18 ,  G11C29/00

Abstract: PURPOSE:To perform data transfer between a host computer and an HDD without providing a data RAM in a control unit. CONSTITUTION:After a bus controller 40 is set when the power source is turned on to change the operation of buffer selectors 18 and 20 from B to C, an ID command is sent to an HDD 1 and an HDD 2. After the controller 40 is set to change the operation of the selectors 18 and 20 from C to B, parameters stored in the RAMs of the HDD 1 and HDD 2 are stored in the RAM of an MPU 26 and the stored parameters are changed into parameters for a mirror disk. The parameters for the mirror disk which are changed are written in the RAM of the HDD 1. And, the parameters for the mirror disk are read out of the RAM of the HDD 1 and sent to a host computer 10 at the same time.