i rewrote the program to reset the hard disk but agian the hard disk doesn't respond. the program is given below.

ORG 0000H
MOV P3,#0FFH
MOV P2,#0FFH
MOV A,#00000111B
MOV P1,A
ORL A,#10000000B
MOV P1,A
MOV R1,#250
Loop: DJNZ R1,Loop
CLR A
MOV P1,A
END

Once the power is supplied to the hard disk, do i need to perform any initialization before sending any command?

regards
chanda