
U.S.
Patent
Apr.
10,
2007
Sheet
13
0f
19
FIG.14
(COMPARISON
PROCESS
)
l
S1401
IS
NUMBER
OF
TIMES
OF
WRITING
EXCESSIVE
?
WRITE
DATA
IN
CACHE
MEMORY
INTO
MAGNETIC
DISK
READ
DATA
FROM
CACHE
MEMORY
N
31403
READ
DATA
FROM
MAGNTIC
DISK
N
31404
M81402
S1405
DO
TWO
PIECES
OF
DATA
COINCIDE
?
US
7,203,135
B2
YES
INFORM
OF
FAILURE
IN
WRITING
N
81406
c
1
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