Writing Data to Flash without Pstorage module

Question

Hello Guys, 
 I am newbie to nrf51822 programming. Currently using nrf51822 (raytac's MDBT40) with S130, SDK11.
I am programming the nrf51822 using arduino IDE using this github repo: github.com/.../arduino-nRF5 
 I want to store data such that even if I update the application, the data should not get erase. There are two options : UICR or flash.
I tried using customer register, but it cannot be rewritten unless entire memory is erased. Based on memory map of nrf51822 ( infocenter.nordicsemi.com/.../bledfu_memory.html , I can write data to upper part of flash just below the bootloader at page address: 0x3C000. Since NVMC has restricted use ( infocenter.nordicsemi.com/index.jsp so I using SD API ( sd_flash_page_erase(60);
sd_flash_write(addrloc,dataloc, 8); 
 When I am printing data at location:
printd.printIntDataln(*(uint32_t )addr);
printd.printIntDataln( (uint32_t *)patwr);
Output is : "-1"
Data is not getting written to location: 0x3c000.
Am I doing something wrong? Is the above mentioned method correct. 
 complete code snippet I am trying:

 uint32_t patwr=0x0FF0;
 uint32_t *addrloc;
 const uint32_t *dataloc;
 addr = (uint32_t) 0x3C000; //(uint32_t *)(pg_size * pg_num);
 addrloc = &addr;
 dataloc = &patwr;
 sd_flash_page_erase(60);
 sd_flash_write(addrloc,dataloc, 8);


Another try:

pg_size = NRF_FICR->CODEPAGESIZE;
 pg_num = NRF_FICR->CODESIZE - 5; // Use last page in flash
 addr = (uint32_t *)(pg_size * pg_num);
 dataloc = &patwr;
 
 sd_flash_page_erase(pg_num);
 /* addr points to the first byte in the last page */
 sd_flash_write(addr, dataloc, pg_size / sizeof(uint32_t));

 patrd = (uint8_t)*(addr-1);


 printd.printIntDataln(pg_size);
 printd.printIntDataln(pg_num);
 printd.printIntDataln(patrd);