README_EXTRACT.txt

# How to Extract Compressed Datasets

Each dataset is compressed with zstd and split into <50GB chunks.

## Extract a dataset:

### Method 1: Extract in place
```bash
# Combine chunks, decompress, and extract
cat scannetpp.tar.zst.* | zstd -d | tar -xf -

# Or for specific dataset:
cat processed_scannet_f.tar.zst.* | zstd -d | tar -xf -
cat arkitscenes.tar.zst.* | zstd -d | tar -xf -
```

### Method 2: Extract to specific location
```bash
# Extract to /data/reason3r/data_compressed/
cat scannetpp.tar.zst.* | zstd -d | tar -xf - -C /data/reason3r/data_compressed/
```

### Method 3: Extract with progress (if pv installed)
```bash
cat scannetpp.tar.zst.* | pv | zstd -d | tar -xf -
```

## Verify before extracting:
```bash
# List contents without extracting
cat scannetpp.tar.zst.* | zstd -d | tar -tf - | head -20

# Check if all chunks present
ls -lh scannetpp.tar.zst.*
# Should have .00, .01, .02, etc. in sequence
```

## Disk space needed:
- scannetpp: ~44GB
- processed_scannet_f: ~310GB  
- arkitscenes: ~560GB

## Transfer files:
```bash
# Copy to another machine (preserves chunks)
rsync -avhP scannetpp.tar.zst.* user@remote:/destination/

# Or use scp
scp scannetpp.tar.zst.* user@remote:/destination/
```