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STM32F40xx - Need for erase before flash programming

Question asked by mueller.florian.001 on Feb 13, 2014
Latest reply on Feb 14, 2014 by Clive One
Is there a need to erase a sector of the internal flash memory of STM32F40xx-Devices before writing new data to that sector?
I couldn't find a hint in PM0081.
The flash_program example of STM32F4xx_DSP_StdPeriph_Lib_V1.3.0 does so, but is there a need for it?
I want to implement a read-modify-write operation an if it is not possible, I couldn't do so on 128kB Sectors.