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Solution for Internal flash programming on STM32F407?

Question asked by nguyen.nhan.002 on Sep 8, 2014

My project with STM32F407 requires save an 100 element array into internal flash(do not use backup SRAM). But first, I have to erase the location sector (128KB), and it take to much time  (about 800ms). Someone can confirm me that: "internal flash programing must erase all bytes in sector or only the bytes save the array?" and show me the solutions when i need reduce saving time.
Thanks in advance.

Best regards,