Indefinite article: A
Definite article: The
Examples:
Indefinite article:
1. A disquette is a small, thin, round, magnetic disk that is used to store data.
2. Please insert a disquette into the floppy disk drive.
Definite article:
1. The disquette contains important data that needs to be backed up.
2. We need to find a way to transfer the data from the disquette to the hard drive.