SD card read/write

[ertw]

Hello, what would be involved with IO to an SD card?

I can’t figure out if this is really easy (just read/write a buffer to a device hosting the physical card), or really difficult (need to know the intricacies of the file system on the card and manage a bunch of state).

I’d like to store some configuration metadata (probably as newline terminated plaintext) and some data used by my program (up to a few hundred KB of data, probably as JSON) in removable storage. Any idea how best to go about this?

Thanks!