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).
2- PL_FD_STATUS_CHECKSUM_ERR: Checksum error has been detected in one of the disk sectors (fatal).
3- PL_FD_STATUS_FORMAT_ERR: Disk formatting error has been detected (fatal).
7- PL_FD_STATUS_DATA_FULL: The disk is full, new data cannot be added.
8- PL_FD_STATUS_NOT_READY: The disk is not mounted.
10- PL_FD_STATUS_NOT_OPENED: No file is currently opened on the current value of the fd.filenum property.
14- PL_FD_STATUS_TRANSACTION_CAPACITY_EXCEEDED: Too many disk sectors have been modified in the cause of the current transaction (fatal).