Browse Prior Art Database

Increased Recording Capacity Using Head-Dependent Pitch

IP.com Disclosure Number: IPCOM000099427D
Original Publication Date: 1990-Jan-01
Included in the Prior Art Database: 2005-Mar-14
Document File: 2 page(s) / 60K

Publishing Venue

IBM

Related People

Christensen, TC: AUTHOR [+2]

Abstract

Disclosed is a method for increased disk file capacity by adapting the track spacing to the read/write width of the recording head.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 55% of the total text.

Increased Recording Capacity Using Head-Dependent Pitch

       Disclosed is a method for increased disk file capacity by
adapting the track spacing to the read/write width of the recording
head.

      In conventional implementations of constant frequency
recording, higher linear densities at smaller radii typically cause
progressively increasing error rates.  A similar error rate increase
is experienced by head read/write widths toward the narrow tolerance
limit.  The standard file design must maintain adequate performance
at the inner radius for the narrowest read/write width.  Thus, the
track-to-track spacing is set to a value large enough to allow the
widest of the read/write widths of heads to function without causing
an undue amount of overwrite damage between adjacent tracks.  For
narrow read/write widths, the extra track-to-track space is
essentially wasted.

      Measurement of the read/write widths of the heads in a file,
such as by amplitude measurements versus radial displacement, allows
a more advantageous use of space resulting in improved file
performance.

      By using a specific track-to-track spacing for each head
allowing only sufficient track space for individual head read/write
widths, the narrower read/write widths will have a smaller recording
band for a given number of tracks. If the outer edge of the band is
maintained at the physical limit, the inner edge of the recording
band can have a larger radius.  This results in lowe...