Browse Prior Art Database

Simplified Erase Structure for Flexible Disk Applications

IP.com Disclosure Number: IPCOM000059866D
Original Publication Date: 1986-Feb-01
Included in the Prior Art Database: 2005-Mar-08
Document File: 2 page(s) / 40K

Publishing Venue

IBM

Related People

Gallagher, TJ: AUTHOR [+2]

Abstract

A magnetic recording head is described which is suitable for vertical magnetic recording on flexible magnetic media, and this head has a read/write pole flanked on each side by erase poles fixed at an extreme angle to the read/write pole. Fig. 1 shows a top view of one embodiment of the magnetic head 1 which comprises a read/write pole 2 and erase poles 3 slanted at an extreme angle to the track direction. All poles are energized by the same coil (not shown). The distance between transitions written by a slanted pole is much lower than that for a standard pole. If the angle between the poles is 85Œ, the ratio of densities written is equal to 11.

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Simplified Erase Structure for Flexible Disk Applications

A magnetic recording head is described which is suitable for vertical magnetic recording on flexible magnetic media, and this head has a read/write pole flanked on each side by erase poles fixed at an extreme angle to the read/write pole. Fig. 1 shows a top view of one embodiment of the magnetic head 1 which comprises a read/write pole 2 and erase poles 3 slanted at an extreme angle to the track direction. All poles are energized by the same coil (not shown). The distance between transitions written by a slanted pole is much lower than that for a standard pole. If the angle between the poles is 85OE, the ratio of densities written is equal to 11. When transitions written by read/write pole 2 are, for example, 3 dB down on the roll-off curve, then those written by the erase poles 3 are many dB down, due to the transition width, separation loss, and head resolution loss. Therefore, the slanted poles 3 can be used as erase poles because the write current causes them to write over any previously recorded data, but this leaves no transitions of any appreciable strength. Another way in which this recording method can be implemented is shown in Fig. 2. The erase poles 4 are perpendicular to the read/write pole 5, and the entire head is rotated. This embodiment has the advantage of being easier to implement.

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