Why is my File System no longer available (because of Error -71)?

FAQ #101559

 

Symptom
After a file system has been filled up completely the files on this module are no longer accessible after the next reboot of the PCD. 

• In case of an FTP access to the PCD, the file system on this memory module (e.g. M1_FLASH:/) is no longer visible.
• In case a "Memory Management" FBox is placed in the Fupla program, the error -71 (FS_FILE_SYSTEM_CHECK_ERROR) is indicated.  

Reason
The reason for this situation is most likely that the whole memory has been used, and there is no more space left for executing a "compression" of the content of the module (see FAQ 101558 for more information regarding the amount of memory available on the file system).
In this case the firmware detects (at start-up of the PCD), that it is no longer possible to correctly manage the flash (e.g. executing a compression) and therefore avoids accessing the memory module with error -71: "Mounted with Errors".

Solution

• If the error happened:
  In case no relevant data is stored on the module it can be made accessible by a format of the module (which can be executed by the "Memory Management" FBox from the library "File System").
  For formatting the card please set up the parameter "Block size: 1024bytes" in the "Memory Management" FBox. (When you set it to "default" the FBox tries to read the block size from the memory card and of course it fails.) 
• In case important data is stored on the module, please contact your local sales office.
• In order to avoid this error:
  - Do not fill-up the flash memory module to the last byte (but as described in the manual to 80%
    if static data is stored, and to 50% if data is regularly written to the flash module.
  - Update the firmware to firmware 1.16.27 and later (or 1.10.61 for older systems); these versions avoid
    the situation that the flash is filled up to the last byte (which can lead to the error -71).  

Remarks

• This phenomenon can occur on the following systems or modules:
  - PCD3.R550, PCD3.R551, PCD3.R561
  - PCD7.R550, PCD7.R551, PCD7.R561
  - INTFLASH of a PCD3 Compact or a PCD1.M2