公开(公告)号：JPH11288358A

公开(公告)日：1999-10-19

申请号：JP560999

申请日：1999-01-12

Applicant: IBM

Inventor： TREIBER RICHARD K ,  HASWELL JONATHAN M ,  NG SPENCER W ,  YAMAGUCHI MARIO

IPC: G06F3/06 ,  G06F12/08

Abstract: PROBLEM TO BE SOLVED: To provide a computer disk drive system having a buffer to which a data preread/prefetch principle is selectively established by including a principle prefetch controller, etc., to receive the data from a user and to produce a prescribed signal as an answer to the data request. SOLUTION: A prefetch principle controller, etc., is prepared to receive the data from a user and to produce a prescribed signal as an answer to the data request. In this system, a disk drive controller 26 can selectively prefetch or interrupt the preread of data to a buffer 24. Thereby, a prefetch principle controller 32 instructs the prefetch of the preread of data to the buffer 24 when a request is received to obtain only the data that are stored in a disk 22. The controller 26 also includes a non-prefetch principle controller 34 which prevents the prefetch of the preread of data to the buffer 24 in the same situation where the prefetch should be originally permitted by the controller 32.