Excavating
Patent
1997-06-26
1999-03-30
Hua, Ly V.
Excavating
371 68, 711114, G11B 2010
Patent
active
058899375
ABSTRACT:
A magnetic disk apparatus includes a plurality of hard disk drives (HDDs) and a decoder for transforming logical addresses received from a host to physical addresses respectively assigned to the HDDs. The HDDs each have 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 the magnetic disk section, and a drive control for controllably driving the magnetic head section in accordance with the physical addresses output from the decoder. The decoder has a function for transforming the logical addresses of a diagnosis command received from the host to the physical addresses of the HDDs while the drive control has a function of controlling a write/read test with the physical addresses produced by the function of the decoder. The decoder further has a function of setting the physical addressees of the radially innermost cylinders of the HDDs as the physical addresses to be diagnosed. The decoder additionally has a function of allocating, when the logical addresses of the diagnosis command are continuous addresses, dividing the logical addresses and then allocating them to the physical addresses.
REFERENCES:
patent: 5050169 (1991-09-01), Monett
patent: 5193184 (1993-03-01), Belsan et al.
Hua Ly V.
NEC Corporation
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