Dynamic magnetic information storage or retrieval – General processing of a digital signal – Data in specific format
Patent
1988-05-12
1991-07-30
Canney, Vincent P.
Dynamic magnetic information storage or retrieval
General processing of a digital signal
Data in specific format
G11B 509
Patent
active
050364081
ABSTRACT:
A disk drive system provides all required synchronization, positioning, validation, and data functions within each disk sector. All of these functions are provided within two zones, a header section and a data section. The header section includes a preamble, a synchronization character and an address field, as well as servo information for track following. The data section of each sector includes a data preamble, a data synchronization character, a bad sector bit map, the data and data redundancy information. The header section of at least one sector in a track includes a short DC-erase field, a transitionless segment which is used in synchronization. To synchronize a read/write head to the disk, the system first detects the DC-erase field. The system next searches for the header premable and synchronization character. If it finds them within predetermined times, it then looks for a valid sector address to complete the synchronization. If the system does not detect the preamble and synchronization character within the predetermined times, it looks for another DC-erase field and continues the synchronization process. After the preamble and synchronization character are found, the desired sector is located by reading the addresses of the succeeding sectors.
REFERENCES:
patent: 3534344 (1970-10-01), Santana
patent: 3893180 (1975-07-01), Braun
patent: 4622602 (1986-11-01), Kutaragi
Leis Michael D.
Leshay Bruce
Muchnik Michael
Rege Satish
Riggle Charles M.
Canney Vincent P.
Digital Equipment Corporation
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