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Document storage requirements

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@@ -20,6 +20,24 @@ The original directory contains 1,841,072 files across:
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  To keep the Hugging Face dataset repository usable, the data is stored as split
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  `.tar.zst` archives instead of uploading the raw file tree.
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  ## Download
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  Install the Hugging Face CLI if needed:
 
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  To keep the Hugging Face dataset repository usable, the data is stored as split
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  `.tar.zst` archives instead of uploading the raw file tree.
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+ ## Storage Requirements
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+
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+ The uploaded split archives take about `119G` on disk (`126.9GB` decimal).
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+ After extraction, the restored `spatialcode_data/` directory takes about `127G`
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+ on disk (`130.9GB` decimal).
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+
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+ Plan for:
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+
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+ - `119G` to download and store only the compressed archive parts.
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+ - `127G` for the fully extracted `spatialcode_data/` directory.
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+ - About `246G` total if you keep both the downloaded archives and extracted
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+ data at the same time.
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+ - `270G+` free space is recommended to leave room for filesystem overhead and
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+ partial downloads.
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+
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+ If disk space is tight, restore one source at a time and delete its archive
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+ parts after verifying extraction.
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+
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  ## Download
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  Install the Hugging Face CLI if needed: