公开(公告)号：JP2001100935A

公开(公告)日：2001-04-13

申请号：JP27403699

申请日：1999-09-28

Applicant: IBM

Inventor： SAITO HIROSHI ,  TAKAHASHI YOSHIYO ,  HIRASHITA SHOICHI

IPC: G06F3/06 ,  G06F11/00 ,  G06F11/14 ,  G11B19/02

Abstract: PROBLEM TO BE SOLVED: To make the command processing efficient by shortening the disk rotation wait time at command execution time. SOLUTION: In command processing wherein multiple execution wait commands sent from a host device are put in a command queue (ENQUE) and a command to be executed next is selected out of the commands (PRO SORT) and executed (KICK NEXT, KICK SEEK), the command which is being executed put back in the command queue if an error occurs to drive-side processing (processing relating to disk access) (error) during the execution of the command, and a command to be executed next is selected out of the execution waiting commands including the put-back command (ERR processing, PRO RESORT) and executed (KICK NEXT, KICK SEEK).

公开(公告)号：JPH1196684A

公开(公告)日：1999-04-09

申请号：JP24270197

申请日：1997-09-08

Applicant: IBM

Inventor： TSUCHIMOTO KAZUNARI ,  TAKAHASHI YOSHIYO ,  YOKOE YUJI ,  SUGANUMA SHIGEMI

IPC: G11B20/10 ,  G06F12/16 ,  G11B20/12 ,  G11B20/18 ,  G11C29/04

Abstract: PROBLEM TO BE SOLVED: To process defects on a recording medium with a small memory capacity by recording leading addresses of blocks in which defects are present and block lengths of defects, and performing recordings with respect to blocks other than recorded defective blocks. SOLUTION: Defective sectors detected by checking physical sectors at the time of manufacturing or at the time of performing a low level formating are registered in a defect map and LBAs(Logical block addresses) are assigned to remaining normal sectors. The defect map is recorded in a determined area being on a magnetic disk 1. The MPU 12 of a control part 5 reads out the defect map from the disk 1 to a RAM 14 at an operating time to instruct the recording and reproducing of data with respect to sectors to which the LBAs are assigned. Here, addresses of leading sectors of defects and lengths of defective sector group are recorded in two bytes and one byte respectively by using a variable length defect map and the map is constituted of recording areas equivalent to, for example, 2000 pairs.