ESP32 Thing Plus SD card read transfer rate

Development Boards MicroMod
1

I just purchased the ESP32 Thing Plus and have some questions about SD card read operations:

  1. Assuming a 100MB/s SD card is used, are SD card read operations fast enough to support continuous streaming of SD card data into the ESP32 to be streamed out (unaltered) via another SPI channel at 40MHz SCK to an external device?

  2. Can the 2-stage data transfer described in question 1 be handled completely by DMA?

  3. Can raw data be stored on an SD card in page/sector writes, or does a FAT file system have to be used?

Thanks.