Use Hadris without the standard library

Disable default features, then select the platform, I/O mode, and capabilities that the target needs:

[dependencies]
hadris-fat = {
  version = "2.1.0",
  default-features = false,
  features = ["read", "sync"]
}

Add alloc for APIs backed by Vec, String, or owned trees. Add write only when mutation or image creation is required. std implies allocation but does not implicitly select sync or async.

All storage I/O flows through hadris-io, allowing callers to adapt firmware, kernel, memory, or device-specific readers rather than depending on std::io.

Choose the narrowest tier

Need	Features
Allocation-free synchronous reader	read,sync
Allocation-free asynchronous reader	read,async
Owned names or buffers	Add alloc
Filesystem mutation	Add write and its required platform tier
Both I/O modes	Enable sync,async and use explicit namespaces

The exact minimum differs by format. NTFS reading requires alloc; ISO and UDF image creation require std. See the complete feature and capability matrix.

For integration examples, see Adapt a custom device and Use asynchronous I/O.