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Zone Recording With Two-Head Slider

IP.com Disclosure Number: IPCOM000101971D
Original Publication Date: 1990-Oct-01
Included in the Prior Art Database: 2005-Mar-17
Document File: 3 page(s) / 74K

Publishing Venue

IBM

Related People

Hashimoto, S: AUTHOR [+3]

Abstract

Disclosed is a method for increasing an areal density in a hard disk drive. This is a zone recording method in combination with a two-head slider. As for head parameters (gap length, track width, coil turns and metal thickness), two heads are optimized for each zone.

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Zone Recording With Two-Head Slider

       Disclosed is a method for increasing an areal density in
a hard disk drive.  This is a zone recording method in combination
with a two-head slider.  As for head parameters (gap length, track
width, coil turns and metal thickness), two heads are optimized for
each zone.

      Fig. 1 shows a schematic illustration of recording tracks using
2-head slider.  The track zone 1 shown in Fig. 1 comprises an ID side
zone 2 and an OD side zone 3.  Fig. 2 shows a schematic illustration
for the relation between 2-head slider 4 and 2-recording zone 2, 3.
The 2-head slider 4 shown in Fig. 2 includes an ID side head 5 and
an OD side head 6.  When the 2-head slider 4 is located at the ID
side zone 2, the ID side head 5 is used.  When the 2-head slider 4
is located at the OD side zone 3, the OD side head 6 is used.
Fig. 3 shows a block diagram for a head selective method.  In this
case, a head select circuit is used for a head selection.

      Embodiment is carried out with 3.5" hard disk drive. In this
embodiment, thin film heads are used.  Head parameters are optimized
for each zone.  The head parameters are listed in Table 1. Track
density is 1300 tpi and 2700 tpi for ID side zone 2 and OD side
zone 3, respectively. Fig. 4 shows schematic illustration for
recording track pattern 7.  Head change position 8 is located in the
middle between ID and OD.  In the result, areal density increased by
20-30% as compared to the usua...