The CoCo SDC is a floppy disk emulator for Tandy Color Computers.

It allows you to store CoCo disk images on an SD card, and mount and use them on your CoCo using the on-board SDC-DOS.
This is easily the best modern storage solution for Color Computers.

Features and Specifications:

• Atmega 328P AVR micro controller @ 10Mhz
• Custom 512 byte boot-loader allows firmware to be updated by the CoCo
• 128K In-System-Programmable Flash
• Accepts SD/SDHC cards formatted with FAT16 or FAT32 file system
• Emulates both the Tandy and DragonDOS floppy disk controller hardware
• LBA access mode for virtual hard disk support
• Extensions to Disk Extended Color Basic in SDC-DOS for disk image manipulation
• DriveWire disk protocol with auto-speed configuration for CoCo 1, 2 or 3
• "Disk Switch" button to support multi-disk programs
• PCB can be mounted in a Tandy FD-502 enclosure or 3d printed enclosure (included)

instructions and details: https://cocosdc.blogspot.com/