Trailer Blocks

Trailer blocks can only be selected if at least one other block on the sector has been defined.  Trailer blocks are never written to the Mifare® card unless this condition is fulfilled.

When a trailer block is clicked this dialog appears:

Here the access keys for the sector are defined as well as a User Data value between 0 and 255.  If Key B is not being used as a key, it can also be used the store user data.

The 8 access conditions define how the trailer can be accessed.  Particular care should be used in selecting this setting.  Some settings prevent the keys on the card from ever being changed in the future, and others have the same affect on the access conditions.  The warning message in the dialog provides additional information.