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README.md

@@ -28,7 +28,7 @@ This dataset provides an accessible, lightweight alternative to the larger FineW
 - **Total Tokens:** ~1.001 Billion
 - **Source:** `HuggingFaceFW/fineweb-edu` (split: `sample-10BT`)
 - **Language:** English
-- **Format:** Apache Arrow (Hugging Face Datasets)
+- **Format:** Apache Parquet
 - **Producer:** Kris Bailey (kris@krisbailey.com)
 
 ## Motivation
@@ -65,6 +65,13 @@ After sampling, we verified the integrity of the new subset:
 - **Actual Size:** 1,001,638,506 tokens (+0.16%)
 - **Distribution Check:** Validated that the relative percentage of each CommonCrawl dump in this 1B subset matches the original `sample-10BT` distribution.
 
+### 5. Format Conversion
+The dataset was converted from Apache Arrow to Apache Parquet to optimize storage and transfer efficiency.
+- **Original Size (Arrow):** ~4.9 GB
+- **New Size (Parquet):** ~2.8 GB
+- **Compression:** ~43% reduction in storage footprint.
+- **Verification:** Row counts were strictly verified against the original Arrow files to ensure zero data loss.
+
 ## fast-usage
 
 ```python

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