
U.S.
Patent
Apr.
10,
2007
Sheet
12
0f
19
US
7,203,135
B2
F|G.13
C
WHITE
PROCESS
D
1
WHITE
DATA
N
S1301
EXECUTE
SEEK
PROCESS
"\J
S1302
IS
DATA
SEQUENTIAL
?
READ
DATA
FRoM
CACHE
MEMORY
READ
ONE
SEGMENT
AT
HEAD
N
31306
AND ONE
SEGMENT
AT
END
FRoM
CACHE
MEMORY
N
31304
I
READ
ONE
SEGMENT
AT
HEAD READ
DATA
FRDM
MAGNETIC
DISK
AND oNE
SEGMENT
AT
END
FRDM
f»
81307
MAGNETIC
DISK
\
S1305
AI
S1308
DO
TWO
PIECES
OF
DATA
COINCIDE
’?
YES
IN
FORM
OF
FAILURE
IN
WRITING
N
31309
C
J
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