One of the following pl_fd_status_codes, also affects fd.laststatus:
0- PL_FD_STATUS_OK: Completed successfully.
8- PL_FD_STATUS_NOT_READY: The disk is not mounted.
12- PL_FD_STATUS_TRANSACTION_ALREADY_STARTED: Disk transaction has already been started (and cannot be restarted).
15- PL_FD_STATUS_TRANSACTIONS_NOT_SUPPORTED: The disk wasn't formatted to support transactions (use fd.formatj with maxjournalsectors>1 to enable transactions).