Cargo Features

SDIO_SDHC has no features set by default.

sdio_sdhc = { version = "0.2.3", features = ["filesystem"] }
filesystem = block_device

Affects sdio_sdhc::fat32

Features from optional dependencies

In crates that don't use the dep: syntax, optional dependencies automatically become Cargo features. These features may have been created by mistake, and this functionality may be removed in the future.

block_device filesystem?