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Volumetric Density Increase Using Interleaved Disk Packs

IP.com Disclosure Number: IPCOM000035332D
Original Publication Date: 1989-Jul-01
Included in the Prior Art Database: 2005-Jan-28
Document File: 2 page(s) / 57K

Publishing Venue

IBM

Related People

Cunningham, EA: AUTHOR

Abstract

In order to obtain more data capacity within a given hard file standard format size, multiple stacks of smaller disks can be used with the disks of the stacks "interleaved". This can result in over 40% more recording surface within the same volume.

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Volumetric Density Increase Using Interleaved Disk Packs

In order to obtain more data capacity within a given hard file standard format size, multiple stacks of smaller disks can be used with the disks of the stacks "interleaved". This can result in over 40% more recording surface within the same volume.

The "interleave" of disks of multiple stacks of smaller disks allows one side of one disk stack to occupy part of the space of a second stack, due to the separation required for the heads. In order to minimize the relative disk velocities where they are interleaved, adjacent stacks are rotated in opposite directions so the general direction of mothion in the interleaved area is essentially the same. For three stacks, there could be two interleaves between two stacks at a time, forming a chain. Such an arrangement with three 95 mm disk stacks is shown in Fig. 1 in an outline of a standard 5.25-inch form factor.

Four stacks can be interleaved in an approximate square with four interleaves of one pair at a time. The disks between opposite corners would not be interleaved. An example of this is shown in Fig. 2, where four 125 mm disk stacks are shown in an 8-inch form factor. The disadvantage in this case is the non-standard size of the 125 mm disks.

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Four stacks can also be interleaved in a chain arrangement, as shown in Fig. 3, where four standard 130 mm disk stacks can be contained in an 8-inch form factor. The four stacks may be separated to two in...