Your 1M version still has the same die as the 2M version. However, only what is specified in the data sheet is checked and guaranteed under the given conditions.
So if you have to guarantee the functionality of your system to someone, you should definitely leave the second 1M block unused.
When your question is answered, please close this topic by choosing Select as Best.
/Peter
In order to give better visibility on the answered topics, please click on Accept as Solution on the reply which solved your issue or answered your question.
