公开(公告)号：MY110615A

公开(公告)日：1998-09-30

申请号：MYPI19911735

申请日：1991-09-25

Applicant: IBM

Inventor： RODNEY JEROME MEANS ,  GARY RAYMOND STEPHENS ,  JOHN EDWARD KULAKOWSKI

IPC: G11B7/00 ,  G11B7/0037 ,  G11B19/02 ,  G11B7/004 ,  G11B11/10 ,  G11B11/105 ,  G11B19/06

Abstract: IN AN OPTICAL DISK DRIVE, UPON EACH POWER OR ON DISK RECEIPT, A MODE CONTROL IS SET TO NON-OPERATE, I.E., NO COMMANDS CAN BE RECEIVED UNLESS A MODE SETTING COMMAND (100) HAS BEEN RECEIVED. ALL OTHER COMMANDS ARE REJECTED FOR PREVENTING ANY ACCESS TO AN OPTICAL DISK (30) PRESENT IN THE DRIVE UNTIL AFTER A MODE SETTING COMMAND HAS BEEN RECEIVED. WHEN A MODE SET COMMAND IS RECEIVED AFTER A POWER ON OR AFTER EACH DISK RECEIPT, THE MODE CONTROL IS SET TO OPERATE WHICH ALLOWS RECEIPT AND EXECUTION OF LEGAL COMMANDS. THE MODE SETTING REQUIREMENT FORCES SELECTION OF WRITE VERIFY OR NOT AND TO TURN LASER (67) OFF OR NOT AFTER A PREDETERMINED TIME DELAY AFTER COMPLETING A LAST COMMAND. (FIG. 5)