MSP430I2041: data storage required

Dear Shrinivas,

i am already used same example code, problem is whenever I will try to overwrite value of same location it would not be excepted by memory

for example

void main(void) {
WDTCTL = WDTPW | WDTHOLD; // Stop Watchdog Timer

FCTL2 = FWKEY | FSSEL_1 | FN1 | FN3 | FN5; // MCLK/42 for Flash Timing Generator

write_InfoSeg(value++); // Write value to Information Segment, increment value

while(1) {
__no_operation(); // SET BREAKPOINT HERE
}
}

void write_InfoSeg(char value) {
unsigned char *Flash_ptr; // Flash pointer
unsigned int i;

Flash_ptr = (unsigned char *)SEGSTART; // Initialize Flash pointer

if(FCTL3 & LOCKSEG) { // If Info Seg is stil locked
FCTL3 = FWKEY | LOCKSEG; // Clear LOCKSEG bit
}
FCTL1 = FWKEY | WRT; // Set WRT bit for write operation

for (i = 0; i < SEG_LEN; i++) {
*Flash_ptr++ = value; // Write value to flash
}

FCTL1 = FWKEY; // Clear WRT bit
FCTL3 = FWKEY | LOCKSEG; // Set LOCKSEG bit
}

In above if I call write_InfoSeg(value++) first i will be excute but when I call this function again that time the *Flash_ptr not updates and store previous value varialble

Dear Shrinivas,

Thank you very much for update.I need 128 bytes  in side the controller to store data and its update frequently in running application. can you tell which location I can used & how.