Android Question Problem in the save data

[darabon]

Hi,
I'm working on a b4a project for an Android tablet.
The tablet installed on my car for managing services (with the date and distance)
When I stopped the car, the tablet shut down frequently.
I saved data in the SQLite database and load from it.
Sometimes, when the monitor starts, the data is lost or not loaded
I attached my project for a better result

 

[darabon]

I found an idea to prevent lost data.
Use USB flash for store data (connect USB flash to monitor and save data into it)
But how do you detect USB flash folders?