公开(公告)号：JPH11110139A

公开(公告)日：1999-04-23

申请号：JP26236897

申请日：1997-09-26

Applicant: IBM

Inventor： FUKUHISA RYOJI ,  SAITO HIROSHI ,  HIRASHITA SHOICHI ,  HASHIMOTO MINORU

IPC: G06F3/06 ,  G11B20/10

Abstract: PROBLEM TO BE SOLVED: To make improvable the performance of inverse reading by starting reading data at an address preceding to a current address at the time point, when the reading of data from a storage medium is finished, when the inverse reading is detected. SOLUTION: A magnetic disk device 10 is provided with a magnetic disk 11, magnetic head 12, actuator mechanism 13, hard disk controller 17 and RAM 18 or the like. The hard disk controller 17 controls operation such as the read/ write of data to the magnetic disk 11. The RAM 18 temporarily stores the supplied data and caches recording/reproducing data. This data reading method is a data reading method for reading data from the storage medium and has an inverse direction detecting step for detecting the inverse reading and a step for starting reading data at the address preceding to the current address at the time point when data are completely read out of the storage medium.

公开(公告)号：JPH1173757A

公开(公告)日：1999-03-16

申请号：JP22901997

申请日：1997-08-26

Applicant: IBM

Inventor： FUKUHISA RYOJI ,  MATSUBARA NOBUYA ,  HIRASHITA SHOICHI

IPC: G11B21/08 ,  G11B19/02 ,  G11B27/10

Abstract: PROBLEM TO BE SOLVED: To shorten the time for processing at every command by executing plural commands containing a first command and a second command sent from a host computer with once command in a device. SOLUTION: A CPU 19 judges whether or not a final address of a first sector address specified by the first command is adjacent with a top address of a second sector address specified by the second address when plural commands are sent from the host computer 22. When not adjacent, a not specified address existing between the first final address and the second top address is specified, and the commands accessing the first, second sector addresses are imparted to the specified address to be imparted to an HDC 17. An access means accesses the sector specified by the second command while skipping the not specified address after it accesses the sector specified by the first command.

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).