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A magnetic recording head providing for full-track erase before writing is suitable for high-density recording on flexible disks having a thick recording medium.
English (United States)
This text was extracted from a PDF file.
This is the abbreviated version, containing approximately
86% of the total text.
Page 1 of 1
Recording Head With Full-Track Erase for Flexible-Disk Applications
A magnetic recording head providing for full-track erase before writing is
suitable for high-density recording on flexible disks having a thick recording
Thick magnetic media pose a special problem for high density recording in
flexible-disk applications, which require full interchangeability between disks and
drives. The problem arises because the read/write gap required for recording at
high density is an order of magnitude smaller than the magnetic coating on the
disk. This means that the field from the head will penetrate the medium to only a
small extent, and that heads with varying gap widths due to manufacturing
tolerances will record to proportionately different depths. Thus data written in one
drive with a slightly larger head gap will not be overwritten successfully in another
drive that has a smaller head gap. Remnants of old data will remain on the disk,
interfering with new data. Because of cost considerations, this problem cannot
be resolved by using a separate erase head.
The drawing shows a specific example of a modified head geometry which
permits full-track erase before writing, with no added cost to the head. This head
includes only one erase core 1 which is about twice as wide as the read/write
core 2. In the drive, the head button is rotated so that the centers of both the
read/write core 2 and the erase core 1 are aligned with the centerline of the track
(shown in da...