Please advise how to read the SD card data directly from PC instead of disconnect the Micro SD from SD card slotter (Micro SD, TF Card).
Just imitate the Arduino program upload process.
You will write an Arduino program and a PC program that talk to each other over the serial port and exchange data.
The PC program mentioned by @jremington is not strictly necessary.
Just send the data from the Arduino to the PC over serial. You can use serial monitor to view it; if you want to save it on the PC, use a proper terminal program that allows you to save to file.
This is surely a lot simpler than you think. The examples included in the SD library should be all you need. That includes dumping an entire file in one go, which may be the facility you will use most.
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