Arduino as SPI Flash?

Hello i know this is a strange topic and i only read about this recently and all. But i know a Arduino company by a some type of programmer like the FTDI or a Ch340 programmer can program the arduino but What about would you use a arduino for to interface with a Micro Sd card Flash controller for? What i don't understand is from this Guy/Girl is what can you do with something like this? Is it possible to interface a arduino to a pc via through the SPI Micro Sd card flash?

Is it really Possible to interface a Arduino to the PC Via the micro SD SPI flash?

SPI, SD card and flash memory are independent of each other.

You can use a SD card to exchange data between the Arduino and PC, if this is what you want to do.