-`hf_xet` uses the Xet storage system, which breaks files down into immutable chunks, storing collections of these chunks (called blocks or xorbs) remotely and retrieving them to reassemble the file when requested. When downloading, after confirming the user is authorized to access the files, `hf_xet` will query the Xet content-addressable service (CAS) with the LFS SHA256 hash for this file to receive the reconstruction metadata (ranges within xorbs) to assemble these files, along with presigned URLs to download the xorbs directly. Then `hf_xet` will efficiently download the xorb ranges necessary and will write out the files on disk. `hf_xet` uses a local disk cache to only download chunks once, learn more in the [Chunk-based caching(Xet)](./manage-cache.md#chunk-based-caching-xet) section.
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