How to erase flash memory (SD card)? [closed]

Question

I am developing embedded system that writes to SD card. As you all know, write access is faster if flash is pre-erased. Is there any easy way to erase flash memory in windows? Thanks, Yony.

Answer 1

The flash memory on an SD card is managed by an on-card controller, you do not have the level of control to directly erase the NAND flash itself.

However when doing a multi-block write (CMD25) you can precede it with a pre-erase command (ACMD23) to pre-erase the blocks; this is significantly faster. However if you specify a pre-erase then terminate the subsequent write, the content of the unwritten blocks is undefined according to the specification. Also pre-erasure is supported only on SD cards, not MMC cards. The details are in the SD Specifications Part 1 Physical Layer Simplified Specification