One of the following pl_fd_status_codes, also affects fd.laststatus:
0- PL_FD_STATUS_OK: Completed successfully.
1- PL_FD_STATUS_FAIL : Physical flash memory failure (fatal).
8- PL_FD_STATUS_NOT_READY: The disk is not mounted.
13- PL_FD_STATUS_TRANSACTION_NOT_YET_STARTED: Disk transaction hasn't been started yet.
15- PL_FD_STATUS_TRANSACTIONS_NOT_SUPPORTED: The disk wasn't formatted to support transactions (use fd.formatj with maxjournalsectors>1 to enable transactions).