On-board interface for concurrent seeks of multiple disk drives of a computer
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United States of America Patent
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Jul 7, 1998
Issued Date -
N/A
app pub date -
Jul 10, 1996
filing date -
Aug 10, 1992
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Abstract
An interface allows a given CPU (Central Processing Unit) to communicate concurrently with a large number of disk drives in a high-performance, low-cost system. Plural seek operations can be performed concurrently, to serve a common processor. Also, heterogeneous physical drives--of any physical or logical configuration (storage capacity, number of heads, and so forth)--can be combined into one or more 'logical' drives as seen by a host operating system. An 'on-board' embodiment provides an 'enhanced' IDE (Integrated Drive Electronics) disk drive that is an extension of the industry-standard IDE drives, allowing an arbitrary number of independently seeking IDE drives on a conventionally single-seeking, two-drive-maximum bus. In a 'paddle board' embodiment, low-cost IDE drives of arbitrary physical size, storage capacity and geometry, can be combined simply and inexpensively into a high-performance storage device. For example, a 3.5' 80 MB (megabyte) drive can be transparently combined with a 2.5' 60 MB drive. The inventive concept can thus be embodied with either a 'paddle board' controller (with standard IDE drives), or with no additional controller (employing 'enhanced' IDE drives).
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