What should I start in order to use the maximum memory space in fstorage?

Question

Hello everybody, 
 I just started using fStorage. When I examine the example, it starts from write address 0x3e000. 
 err_code = nrf_fstorage_write(&fstorage, 0x3e000, m_hello_world, sizeof(m_hello_world), NULL); APP_ERROR_CHECK(err_code); 
 Q-1 How is this write address determined? 
 Q-2 For example, when I write12 bytes data, what should I start with the next write address? 
 
 Thank you.

purgoufr · Accepted Answer

After Kristin's help, I finally get the solution. 
 I do not know exactly why, If you want to record a sequence directly, it gives an error. So I have defined external an array( m_deadbeef[10] ) in the fds_write function. Then I copied the array that I want to save into m_deadbeef. And the problem is solved. static ret_code_t kls_fds_write(uint32_t write_file_id, uint32_t write_record_key , uint8_t write_data[])
{ 
 static uint8_t m_deadbeef[10] = {0};
 
 memcpy(m_deadbeef, write_data, sizeof(m_deadbeef));
 
 fds_record_t record;
 fds_record_desc_t record_desc;
	
 // Set up record.
 record.file_id = write_file_id;
 record.key = write_record_key;
 record.data.p_data = &m_deadbeef;
 record.data.length_words = sizeof(m_deadbeef)/sizeof(uint8_t);
 
 ret_code_t ret = fds_record_write(&record_desc, &record);
 if (ret != FDS_SUCCESS)
 {
 return ret;
 }
 NRF_LOG_INFO("Writing Record ID = %d 
",record_desc.record_id);
 return NRF_SUCCESS;
	
}
	
static ret_code_t kls_fds_read(uint32_t read_file_id, uint32_t relevant_record_key , uint8_t read_data[])
{	
 fds_flash_record_t flash_record;
 fds_record_desc_t record_desc;
 fds_find_token_t ftok ={0};//Important, make sure you zero init the ftok token
 uint8_t *data;
 uint32_t err_code;
 
 NRF_LOG_INFO("Start searching... 
");
 // Loop until all records with the given key and file ID have been found.
 while (fds_record_find(read_file_id, relevant_record_key, &record_desc, &ftok) == FDS_SUCCESS)
 {
 err_code = fds_record_open(&record_desc, &flash_record);
 if ( err_code != FDS_SUCCESS)
 {
 return err_code; 
 }
 
 NRF_LOG_INFO("Found Record ID = %d
",record_desc.record_id);

 data = (uint8_t *) flash_record.p_data;
 for (uint8_t i=0;i<flash_record.p_header->length_words;i++)
 {
 read_data[i] = data[i];
 }
 
 
 NRF_LOG_HEXDUMP_INFO(read_data, sizeof(read_data));
 // Access the record through the flash_record structure.
 // Close the record when done.
 err_code = fds_record_close(&record_desc);
 if (err_code != FDS_SUCCESS)
 {
 return err_code;	
 }
 }
 return NRF_SUCCESS;	
}

What should I start in order to use the maximum memory space in fstorage?

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