Browse Prior Art Database

Dual Gap Head

IP.com Disclosure Number: IPCOM000042373D
Original Publication Date: 1984-May-01
Included in the Prior Art Database: 2005-Feb-03
Document File: 1 page(s) / 12K

Publishing Venue

IBM

Related People

Hill, MK: AUTHOR [+3]

Abstract

The ferrite transducer head of Fig. 1, which shows the surface that confronts the storage medium, has U-shaped two-rail air bearing surface (ABS) 4 with a slightly inclined ABS surface portion 5 adjoining the leading edge. An etched, negative pressure surface 6 surrounds the air bearing surface. Adjacent the trailing edge of each side rail air bearing surface portion is a read/write gap 7. This design lowers the possibility of head-disk contact in the area of the read/write gap and the associated opportunity for gap chipping or collection of debris that could affect the gap field or both as compared to a three-rail design with a gap at the trailing edge of the center rail.

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Dual Gap Head

The ferrite transducer head of Fig. 1, which shows the surface that confronts the storage medium, has U-shaped two-rail air bearing surface (ABS) 4 with a slightly inclined ABS surface portion 5 adjoining the leading edge. An etched, negative pressure surface 6 surrounds the air bearing surface. Adjacent the trailing edge of each side rail air bearing surface portion is a read/write gap 7. This design lowers the possibility of head-disk contact in the area of the read/write gap and the associated opportunity for gap chipping or collection of debris that could affect the gap field or both as compared to a three-rail design with a gap at the trailing edge of the center rail. In considering applications of a single gap head, it is obvious that top and bottom heads must have opposite rail gap placement in order to record over the same radial band on their respective surfaces. From the standpoint of head yield alone, it may be advantageous to begin with a dual gap slider even for the case where only one gap is finally used. The cost of scrapping defective single gap heads may outweigh the cost of the dual gap design, where much less rejection would occur for single gap (top/bottom) application. Even a single (active) gap head design could contribute significantly to optimization of the recording process (Fig. 2). If the gap were placed in the outer rail, then the (present) recording zone would be shifted l/2 head width toward the OD given the same head f...