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Fix OneDrive ZIP Extraction: Why a 20GB File Extracts to Only 10GB
Question details
The user downloaded a 20 GB ZIP archive of photos from OneDrive, but upon extraction using a third-party tool, the resulting folder only contained 10 GB of data, raising concerns about missing files.
- Product
- Microsoft OneDrive
- Device & OS
- not provided
- Scenario
- Downloading and extracting a large archive of backed-up photos from cloud storage.
- Observed behavior
- Windows File Explorer failed to extract the 20 GB ZIP file, and a third-party extraction tool output a folder of only 10 GB, indicating an incomplete download or corrupted archive.
Ensure you have at least 40 GB of free space on your local hard drive (20 GB for the downloaded ZIP and another 20+ GB for the extracted contents) to prevent the extraction from silently failing midway.
Use a Reliable Third-Party Archiver and Verify File Counts
Windows File Explorer often struggles with very large ZIP files. Use a robust tool like 7-Zip or WinRAR and cross-check the extracted files with OneDrive to confirm integrity.
Built-in Windows extraction tools can timeout or silently fail when processing massive archives. Dedicated extraction software handles large data sets much better and provides error logs if the archive is corrupt.
Download and install a dedicated archive utility such as 7-Zip or WinRAR from their official websites.
Right-click the downloaded 20 GB ZIP file, hover over '7-Zip' (or your chosen tool), and select 'Extract to [Folder Name]'.
Once the extraction is complete, right-click the newly created folder and select 'Properties' to view the exact size and file count.
Log into OneDrive online, navigate to your photo folder, and compare the total number of items in the cloud with your local folder to see if files are actually missing.
Re-download Files in Smaller Batches
Large single-file downloads from OneDrive can sometimes timeout or corrupt. Downloading in smaller chunks ensures data integrity.
Manage Your Documents and Cloud Files Smoothly with WPS Office
While troubleshooting large OneDrive file downloads, you might be looking for a more streamlined way to handle your daily documents. WPS Office provides a lightweight, comprehensive office suite that integrates beautifully with multiple cloud storage services, ensuring you never lose track of your important files.
- 1. Download WPS Office: Visit the official WPS website and download the free installation package for your operating system.
- 2. Connect Your Cloud: Launch WPS Office, go to the file manager, and sign in to link your preferred cloud storage accounts for direct access.
- 3. Work Seamlessly: Open, edit, and save your documents with full Microsoft Office compatibility, keeping all your files safely synced.
Frequently Asked Questions
Why does a ZIP file show a different size after extraction?
ZIP files compress data to save space. While photos (like JPEGs) are usually already compressed and don't shrink much, an incomplete download or corrupted archive might abruptly stop the extraction process, resulting in a much smaller extracted folder size than the original archive.
Why does Windows File Explorer fail to extract my 20 GB ZIP file?
The built-in Windows ZIP extractor frequently struggles with files over 4 GB or archives containing complex directory structures. Using third-party tools like 7-Zip or WinRAR is strongly recommended for large archives.
How do I know if my OneDrive ZIP download was incomplete?
If the downloaded ZIP file size is significantly smaller than the folder size reported on OneDrive, or if your extraction tool throws an 'unexpected end of archive' error during the extraction process, the download likely failed before finishing.
