International Business Machines Corporation

Takumi Satoh

Atsushi Kanamaru

Toshio Kakihara

Masahiko Sato

Yoshinao Harada

Hidetsugu Tanaka

Masahiko Satoh

A method for removing accumulated particles that have adhered to a head for reading/writing data to a rotation disk type recording medium in an information recording and reproducing apparatus. First a disk read/write operation is stopped. A vibration amplitude is then selected. The head repeatedly performs a seek operation with the selected amplitude so as to vibrate the head. A new vibration amplitude is then selected, and the head repeatedly performs seek operations with the new amplitude. The vibration amplitude is gradually changed so that the head performs seek operations over a range of amplitudes, thereby removing accumulated particles that have adhered to the head.

Method and apparatus for removing accumulated particles on a head in an information recording and reproducing apparatus

A disk drive unit and an error recovery method for the disk drive unit which can reduce processing time for ERP in resetting, thereby shortening response time to the reset is described. A normal error recovery procedure is executed if there is no reset request when a write error occurs, but if there is a reset request pending, a data record in which a write error occurs is registered as a defective position (e.g. sector) and an alternate (spare) position is assigned to accelerate the time when the drive can respond to the reset instruction. Data records with alternate positions assigned as a part of the reset activity are specially marked so that alternate position assignment can be undone as soon as is appropriate, for example, when the record is next read or written.

Disk drive unit and error recovery method executing shorter error

Growing community of inventors

Sagamihara, Japan

Takumi Satoh