Reverse Engineering a SanDisk High Endurance microSD Card: Uncovering the Flash Memory Secret
2025-02-02
Blogger Jason reverse-engineered a SanDisk High Endurance microSD card to uncover the mystery of its flash memory. SanDisk was tight-lipped about the type of flash used, even refusing to answer his support requests. Through meticulous analysis of test pads and bus signals, Jason determined that the card uses Toshiba/Kioxia BiCS3 3D TLC NAND flash. He detailed the NAND Flash ID and JEDEC Parameter Page, overcoming challenges like deciphering obscure test pad layouts, controller interference, and SanDisk's custom Parameter Page format. The findings reveal the use of 3D TLC flash, but SanDisk's secrecy surrounding this detail sparked Jason's criticism.
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Hardware
NAND flash