It is written in some sites that for NOR flash, each byte has to be written with 0 before erase. Why it is required to write with 0 before erasing? Erasing the sector change each byte to 1.

  • \$\begingroup\$ Link............ \$\endgroup\$ – DKNguyen Jun 9 '20 at 15:28
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    \$\begingroup\$ Can you provide some links from those websites so that we have more context of what you're talking about? Wikipedia might be able to answer your question. \$\endgroup\$ – user103380 Jun 9 '20 at 15:31
  • \$\begingroup\$ Isn't this just from a security perspective, because flash doens't actually overwrite during an erase, and just marks that bank as 'empty'? \$\endgroup\$ – Joren Vaes Jun 9 '20 at 15:31
  • \$\begingroup\$ embedded.com/flash-101-nand-flash-vs-nor-flash \$\endgroup\$ – indira Jun 9 '20 at 15:45
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    \$\begingroup\$ those two links are duplicate articles \$\endgroup\$ – jsotola Jun 9 '20 at 16:27

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