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Hard disk apparatus capable of transforming logical addresses of apparatus diagnosis cylinders to HDD-by-HDD physical addresses

  • US 5,889,937 A
  • Filed: 06/26/1997
  • Issued: 03/30/1999
  • Est. Priority Date: 06/27/1996
  • Status: Expired due to Term
First Claim
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1. A magnetic disk apparatus comprising:

  • a plurality of hard disk drives (HDDs); and

    a decoder for transforming logical addresses received from a host to physical addresses respectively assigned to said plurality of HDDs as user cylinders;

    said plurality of HDDs each comprising;

    a magnetic disk section including at least one magnetic disk for storing data;

    a magnetic head section for selectively writing or reading data in or out of said magnetic disk section; and

    a drive control for controllably driving said magnetic head section in accordance with the physical address output from said decoder;

    said decoder having a diagnosis address transforming function for transforming logical addresses of a diagnosis command received from the host to the physical addresses of said plurality of HDDs as diagnosis cylinders associated with each of said plurality of HDDs;

    said drive control having a function of controlling a write/read test at the physical addresses produced by said diagnosis address transforming function by test data being written to and read out of said diagnosis cylinders to protect data stored in said user cylinders from damage.

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