Havant International Limited

International Business Machines Corporation

Anthony W Leonard

Anthony R Hearn

Peter J Elliott

George A Cunningham

David R Farquhar

David T James

Robert N Evans

A method and apparatus for writing clock data to a storage medium, such as a disk, is disclosed. The storage medium has tracks on which data are stored. Clock data is written to a present track on the storage medium. The written clock data is read from said present track. Clock data for a subsequent track on the storage medium is generated from the clock data read from said present track. The phase of the generated clock data for the subsequent track is compared with a reference timing signal and the phase of the generated clock data for the subsequent track is adjusted in accordance with said comparison. Said phase adjusted clock data for the subsequent track is written to said subsequent track. Phase errors can be significantly reduced and, for practical purposes, substantially eliminated. It is not necessary to provide a dedicated clock read/write head.

Method and apparatus for writing a clock track on a storage medium

A mounting for a disk file comprises a carrier defining a space into which the disk file can be removably inserted for operational use. The carrier has a base and two opposed sides and, and first and second wedges and which are movable to act between the main body of the disk file and the side of the carrier, to secure the disk file against movement relative to the carrier. The wedges include wedges which are movable in a vertical direction by a control linkage operated automatically when the disk file is inserted into the carrier structure.

Disk file mounting

A magnetic disk drive is provided with a system and method for writing a servo pattern after the head disk assembly (HDA) is sealed. A clock track is written inside the sealed HDA using a Monte Carlo technique. The clock track is read by a magneto-optical head through a window in the HDA housing, and the time transitions therefrom are used to control the product heads. The entire servo pattern for the disk drive is thus written with the HDA unit completely sealed.

System and method for servowriting a magnetic disk drive

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Rowlands Castle, United Kingdom

Anthony W Leonard