srobertjames
New Member
Hi. I'm trying to get started in using Flash memory (SD cards) in projects. My understanding was that flash can not be written to unless it's first erased; and that, unlike magnetic media, deleting a file from flash actually overwrites the data with 1111s. However, some experiments with a SD card reader on a PC and a drive imager show that even after deletion, the data bytes are still there, and that new files seem to overwrite them.
Can anyone clarify whether Flash is directly overwriteable, or needs an erase command first? What happens when you delete a file from a Flash memory card?
What's the best way to get started with Flash hardware in projects? Any good guides?
Can anyone clarify whether Flash is directly overwriteable, or needs an erase command first? What happens when you delete a file from a Flash memory card?
What's the best way to get started with Flash hardware in projects? Any good guides?