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：JP2003151229A

公开(公告)日：2003-05-23

申请号：JP2001343822

申请日：2001-11-08

Applicant: IBM

Inventor： TOKIZONO AKIRA ,  AONO SHIROO ,  OTA SHUNICHIRO ,  UNOKI TOSHIRO ,  HASHIMOTO MINORU

IPC: G11B21/21 ,  G11B5/55 ,  G11B21/08

Abstract: PROBLEM TO BE SOLVED: To prevent undulation of a lubricating film on a magnetic disk and to decrease the writing defects occurring in this undulation. SOLUTION: The hard disk drive which reads out or writes data by a magnetic head 4 from the magnetic disk 2 rotating in accordance with a command from a host computer detects the moving quantity in the radial direction of the magnetic head 4 within a prescribed period and seeks the magnetic head 4 by the prescribed quantity when the detected moving quantity is small.

公开(公告)号：JPH08235793A

公开(公告)日：1996-09-13

申请号：JP32736395

申请日：1995-12-15

Applicant: IBM

Inventor： YAMAGUCHI MARIO ,  HASHIMOTO MINORU ,  SAKAI TATSUYA ,  JIYON HAZUUERU

IPC: G06F3/06 ,  G06F11/10 ,  G11B20/12 ,  G11B20/18 ,  G11B27/10

Abstract: PROBLEM TO BE SOLVED: To improve the reliability by discriminating an error in correspondence between data held on a disk and addresses, and then store more information on the disk. SOLUTION: User data D when written is held in a register 46, and an error correction code ECC is generated by ECC generation algorithm Ar from both the user data D and its sector information (ID). The record consisting of the user data D and generated ECC is written on the disk; when the record is read out, the user data Dr of the read record Rr is. held temporarily in the register 46, the ECC is separated from the read record Rr, and an error check on the combined data of the user data D and sector information used as the address is made by ECC check algorithm. Only when it is judged by this error check that the sector information contains no error, the user data held in the register 46 is corrected and outputted to a host.