Storing partial credit card numbers

Question

Possible Duplicates:

1. Best practices for taking and storing credit card information with PHP
2. Storing credit card details
3. Storing Credit Card Infor

Answer 1

If you don't need to store the whole credit card number, why do you need to store it at all? If you want to save the financial institution that issued the card, why don't you store the financial institution that issued the card?