why can the pstorage module read the data after reset?

Question

HI ,ALL 
 i need to take use of the pstorage module. 
 i can read the data after reset,but i do not know the reason. 
 
 
 the write function is added in the on_write function in ble_nus.c and not list here 
 
 
 the project is the ' \examples\ble_peripheral\ble_app_uart ' 
 
 
 Following is my source code.
//my read function 
 
 
 void ReadPstorage(void){ 
 printf("
read flash: ");
	my_flag = 0;
	pstorage_handle_t dest_block_id;
	uint8_t buff[8];
	//因为只注册了一个 flash 块，所以其实这个函数可以不调用的。
	pstorage_block_identifier_get(&block_id,0,&dest_block_id);
 printf("&block_id : %p
",&dest_block_id);
 printf("buff : %p
",buff);
	pstorage_load(buff, &dest_block_id, 8, 0);

	for(int i = 0; i< 8; i++)
	{
 printf("%d ",buff[i]);
	}	
 
 } 
 //my main function 
 int main(void)
{ 
 uint32_t err_code;
bool erase_bonds;
uint8_t start_string[] = START_STRING;

pstorage_module_param_t module_param;
	module_param.block_count = 1; 
	module_param.block_size = 16;
	module_param.cb = my_cb;
	pstorage_init(); 
	pstorage_register(&module_param, &block_id);
// Initialize.
APP_TIMER_INIT(APP_TIMER_PRESCALER, APP_TIMER_OP_QUEUE_SIZE, false);
uart_init();
buttons_leds_init(&erase_bonds);
ble_stack_init();
gap_params_init();
services_init();
advertising_init();
conn_params_init();

printf("%s",start_string);
	ReadPstorage();

err_code = ble_advertising_start(BLE_ADV_MODE_FAST);
APP_ERROR_CHECK(err_code);
	
// Enter main loop.
for (;;)
{
 power_manage();
 if(my_flag == 1)
 {
 ReadPstorage();
 }
}
 
 }

RK · Accepted Answer

What? The 'P' in PStorage stands for persistent . That's the whole idea of persistent storage, it doesn't go away after reset, or indeed at all unless you explicitly wipe it out. So of course you can read it after reset, that's the whole point of it being persistent.