I am new to SPI flash memory reading and/or writing. As I was fiddling with it, I see that I cannot write to the first 32 bytes of the device GD25Q128C. It always reads back something that I have not written.

I have checked online and think that it could be due the first 32 bytes of every page is used for some other purpose?

I can successfully write and read from the remaining addresses.

Can somebody give more information on this?