Hi friends,

I am designing a system wherein the user can make a design (design will be made in VB which provides a similar interface like excel , design consist of 1 and 0). Now this design with the design name and data will be send to the microcontroller.

The system can be used online or offline. It is user's choice to save it or not. So i am using serial eeprom of 128KB for saving the user design. The design data is never of same size, of course the max design size is limited by memory size.
When the system is used offline(not hooked to PC), user can recall the design using LCD interface and keypad and choose the required design.

Now the problem i am facing is maintaing records of variable data size.

I thought of using a table of pointers pointing to desings and other table of pointers pointing to free space. But when the user deletes the a particular design and stores data of some other size, the data will be divided in fragments. And i am not sure about the size of table of pointers pointing to free space which can start increasing.

What are your desing ideas for maintaining this type of database managment .



Thanks
Pravin