Design Your Own USB-MicroSD Card Reader Schematic for PCBs | Blogs | Altium
SD card module for 5V microcontrollers - please explain this one
Amazon.com: Stemedu 5PCS Micro S D Card Reader Module Memory Storage Mini TF Card Adapter SPI Interface Breakout Modules for Arduino Raspberry Pi with 40P Dupont Cable : Electronics
How to design the microSD circuitry
Read and write files from and to SD card with PIC18F4550 - CCS C