Array in an array

[TempodiBasic]

@nasacow

I have loosen the structure of data that you have planned.... I see a StudentType, a MasterAssignment and a SlaveAssignment.
In the first and in the last structure you use an ID to identify and  correlate the data. In MasterAssignment there is no ID.
You like to have all the data into one file.

I think that to keep in one file all the data you need to use an ID also for the third structure of data.
In this manner you can access to the searched data using the ID as index:
here an example

this is the file
________________________________________________________________________________________________
|long digit| records of StudentType|long digit|records of MasterAssignment|long digit|records of SlaveAssignment|CRC|
|_______ |___________________________ |_______________________ |______________________________|___ |
^              ^                                ^               ^                                    ^               ^                                   ^
 |               |                                 |                |                                     |                |                                    |
number of   |_________DATA         number of   |_________DATA             number of    |_________DATA            |__Security data
Student records                         Master Assignment                               Slave Assignment
                                                      records                                          records

while in RAM you load the data into 3 array with which you can work.