# Shave ~3GB From Windows OS Drive

This is a great trick to save a few gigabytes of space on the OS, especially if you have a smaller mSata SSD for the boot drive.

1. Right click the Start button > Command Prompt (Admin)
2. Run the following command to compress OS files
   Compact.exe /CompactOS:always
3. The command takes about 10 minutes to complete depending on your hard drive and will free about 3 GB of space

## Reverting the Compression

If for some reason you want to undo this change you can use the steps below to decompress the OS files

1. Right click the Start button > Command Prompt (Admin)
2. Run the following command to compress OS files
   Compact.exe /CompactOS:never