https://devzone.nordicsemi.com/f/nordic-q-a/17177/start-using-fds-what-is-the-difference-between-fds_record_write-and-fds_record_updateWith the same file id and record id, do these two functions do the same thing? Thanks Paulen-USTelligent Community 13Thu, 20 Oct 2016 07:17:26 GMThttps://devzone.nordicsemi.com/thread/65985?ContentTypeID=1Thu, 20 Oct 2016 07:17:26 GMT137ad170-7792-4731-bb38-c0d22fbe4515:6c6491c3-4537-488b-b523-cbf31ca0d9d5J&#248;rgen Holmefjord<p>Hi,</p> <p>No, as described in the <a href="http://infocenter.nordicsemi.com/topic/com.nordic.infocenter.sdk5.v12.0.0/lib_fds_functionality.html?cp=4_0_0_3_31_0">FDS Library documentation</a>, it is possible to have multiple records with the same FILE_ID and RECORD_ID. If you call <a href="http://infocenter.nordicsemi.com/topic/com.nordic.infocenter.sdk5.v12.0.0/group__fds.html?cp=4_0_0_6_8_8_29#gac5f0ae356868529af04dc49815e534b0"><code>fds_record_write()</code></a>, it will only create a new record, meaning you will have two record with the same RECORD_ID. <a href="http://infocenter.nordicsemi.com/topic/com.nordic.infocenter.sdk5.v12.0.0/group__fds.html?cp=4_0_0_6_8_8_28#gabed63ec9b99aa4307d92499177320335"><code>fds_record_update()</code></a> on the other hand, will create a new record and then invalidate the old record, leaving you with only one record.</p> <p>When calling <code>fds_record_update()</code>, the parameter <em>p_desc</em> must point to the old record to be invalidated. On return, <em>p_desc</em> will point to the new record, similar to the return of <code>fds_record_write()</code>.</p> <p>Best regards,</p> <p>Jørgen</p><div style="clear:both;"></div>