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prostatectomy/TRANSFER_README.md

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+# Prostatectomy split archive transfer guide
+
+This is a new transfer guide. It does not replace or modify the source dataset's
+original `prostatectomy/README.md`.
+
+## Archive layout
+
+All archives are uncompressed tar files. Every archive retains the top-level
+`prostatectomy/` path, so extracting every part into the same parent directory
+reconstructs the original dataset tree.
+
+First batch:
+
+- `prostatectomy_non_video.tar`: original `README.md`, `data/`, and `meta/`
+- `prostatectomy_videos_chunk-000.tar`
+- `prostatectomy_videos_chunk-001.tar`
+- `prostatectomy_videos_chunk-002.tar`
+- `prostatectomy_videos_chunk-003.tar`
+- `prostatectomy_videos_chunk-004.tar`
+
+Remaining video chunks to package after the first batch has been uploaded and
+local space has been reclaimed:
+
+- `chunk-005` through `chunk-010`
+
+Files ending in `.partial` are still being written and must not be uploaded.
+Only upload files whose names end exactly in `.tar`.
+
+## Reconstruct on the destination machine
+
+Choose the parent directory that should contain `prostatectomy/`:
+
+```bash
+DEST_PARENT=/path/to/cmr_surgical
+mkdir -p "${DEST_PARENT}"
+
+tar -xf prostatectomy_non_video.tar -C "${DEST_PARENT}"
+for archive in prostatectomy_videos_chunk-*.tar; do
+    tar -xf "${archive}" -C "${DEST_PARENT}"
+done
+```
+
+This produces:
+
+```text
+${DEST_PARENT}/prostatectomy/
+├── README.md
+├── data/
+├── meta/
+└── videos/
+    ├── chunk-000/
+    ├── chunk-001/
+    └── ...
+```
+
+Parts may be extracted in any order. Extracting later batches into the same
+`DEST_PARENT` adds the remaining chunks without changing existing chunks.
+
+## Basic verification
+
+Check an archive before extracting:
+
+```bash
+tar -tf prostatectomy_non_video.tar >/dev/null
+tar -tf prostatectomy_videos_chunk-000.tar >/dev/null
+```
+
+After every batch has been extracted, the complete dataset should contain video
+directories `chunk-000` through `chunk-010`.