William K Weberg

US Patent:

58186549, Oct 6, 1998

Filed:

Jun 4, 1997

Appl. No.:

8/869041

Inventors:

Prafulla B. Reddy - Santa Cruz CA
Jimmie R. Shaver - Yukon OK
Sean R. Atsatt - Santa Cruz CA
Mark H. Groo - Boulder Creek CA
Timothy V. Gates - Sunnyvale CA
William K. Weberg - Los Gatos CA

Assignee:

Seagate Technology, Inc. - Scotts Valley CA

International Classification:

G11B 509
G11B 5596

US Classification:

360 53

Abstract:

A memory medium has a plurality of tracks arranged in a plurality of sectors with each track sector having a format which does not include header fields identifying sectors or sector defects or defect management procedures. Track management apparatus identifies the track sector currently confronting a transducer; the track management being based on sector pulses (in the case of a dedicated servo system), or being calculated based on track information, an index pulse and data wedge information from previous wedges (in the case of embedded servo systems), or being derived from a lookup table. To accommodate sector defects, a defect bank contains the identity and type of each defective or spare sector. Defect management apparatus is connected to the defect bank and track management apparatus to indicate when the sector confronting the transducer is a defective or spare sector to halt data transfer to thereby skip the defective sector, or to generate an interrupt signal to the processor to transfer data between the processor and an alternate sector.

US Patent:

59833092, Nov 9, 1999

Filed:

Aug 20, 1997

Appl. No.:

8/917005

Inventors:

Sean R. Atsatt - Santa Cruz CA
Pervez Edul Virjee - Santa Cruz CA
Prafulla Bollampalli Reddy - Santa Cruz CA
Mark Hubert Groo - Boulder Creek CA
Timothy Verne Gates - Sunnyvale CA
William Kent Weberg - Los Gatos CA
Jimmie Ray Shaver - Yukon OK

Assignee:

Seagate Technology, Inc. - Scotts Valley CA

International Classification:

G06F 1210
G06F 1100

US Classification:

711 4

Abstract:

An address translation unit is provided for logical to physical address conversion. In particular, apparatus and method are described for receiving a logical cylinder head sector for a logical block address and converting it into a physical cylinder head sector. If a logical block address is received, it is converted to a physical block address and then the physical block address is converted into a physical cylinder head sector. If a logical cylinder head sector is first received, it is converted into a logical block address, and then the conversion takes place just as it would for an initially received logical block address.

US Patent:

62951769, Sep 25, 2001

Filed:

May 16, 1997

Appl. No.:

8/857535

Inventors:

Prafulla B. Reddy - Santa Cruz CA
Jimmie R. Shaver - Yukon OK
Sean R. Atsatt - Santa Cruz CA
Mark H. Groo - Scotts Valley CA
Timothy V. Gates - Sunnyvale CA
William K. Weberg - Los Gatos CA

International Classification:

G11B 509

US Classification:

360 48

Abstract:

A memory medium has a plurality of tracks arranged in a plurality of sectors with each track sector having a format which does not include header fields identifying sectors or sector defects or defect management procedures. Track management apparatus identifies the track sector currently confronting a transducer; the track management being based on sector pulses (in the case of a dedicated servo system), or being calculated based on track information, an index pulse and data wedge information from previous wedges (in the case of embedded servo systems), or being derived from a lookup table. To accommodate sector defects, a defect bank contains the identity and type of each defective or spare sector. Defect management apparatus is connected to the defect bank and track management apparatus to indicate when the sector confronting the transducer is a defective or spare sector to halt data transfer to thereby skip the defective sector, or to generate an interrupt signal to the processor to transfer data between the processor and an alternate sector.