Browse Prior Art Database

Smaller Inner Diameter Disk for High Capacity

IP.com Disclosure Number: IPCOM000114663D
Original Publication Date: 1995-Jan-01
Included in the Prior Art Database: 2005-Mar-29
Document File: 2 page(s) / 45K

Publishing Venue

IBM

Related People

Kurachi, K: AUTHOR [+3]

Abstract

Disclosed is a design for a magnetic hard disk for higher capacity in hard disk drives. Higher capacity per a disk can be achieved by providing smaller inner diameter of a disk to increase the disk recording surface area. The design is widely applicable to all hard disk drives that have a disk (or disks) inside the disk enclosure.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 83% of the total text.

Smaller Inner Diameter Disk for High Capacity

      Disclosed is a design for a magnetic hard disk for higher
capacity in hard disk drives.  Higher capacity per a disk can be
achieved by providing smaller inner diameter of a disk to increase
the disk recording surface area.  The design is widely applicable to
all hard disk drives that have a disk (or disks) inside the disk
enclosure.

      The design can be best understood with reference to the
drawings of the magnetic hard disk as shown in Figs. 1 and 2.
Dimensions of inner and outer diameter of current hard disks (1.8",
2.5", 3.5", 5.25" ..and what not) are basically optimized to provide
the maximum recording capacity on a disk surface with constant
frequency magnetic recording.  When an outer diameter (Dout) of the
disk is given from the dimension of the disk enclosure design, inner
diameter (Din) which is a half of the outer diameter ((1/2)*(Dout))
is the optimized dimension for constant frequency magnetic recording.
Conventional disks keep this dimensional relationship between outer
diameter and inner diameter (Fig. 1).  On the other hand, the inner
diameter of the disclosed new disk design is smaller than a half of
the outer diameter ( (Din)' < ((1/2)*(Dout)) ) to provide the more
disk surface area for the more recording capacity on the disk with
constant density recording which is realized by Zone Bit Recording
(ZBR) (Fig. 2).

      For the proposed design, when the ratio of the smaller inner
diamet...