Hi,
I would start with an LabVIEW shipping example program, this would give you a good idea of how to implement it and also give you directions on how to avoid the typical pitfalls.
You can use the "Write Datalog Example.vi" and the "Read Datalog Example.vi" to write and recover the data from disk. You will find this example programs on LabVIEW example >> Fundamentals >> File Input and Output.
I hope it helps
Best Regards
Andre Oliveira
Applications Engineer
National Instruments