EXT_CSD_SEC_COUNT
sectors = ext_csd[EXT_CSD_SEC_COUNT + 0] << 0 |
ext_csd[EXT_CSD_SEC_COUNT + 1] << 8 |
ext_csd[EXT_CSD_SEC_COUNT + 2] << 16 |
ext_csd[EXT_CSD_SEC_COUNT + 3] << 24;