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What Is File Extension SFCACHE?

The file extension SFCACHE indicates a ReadyBoost cache file. SFCACHE files can help boost your computer's performance by providing up to 4 GB of additional virtual memory.

  1. Definition

    • Microsoft added the ReadyBoost feature to Windows computers beginning with Windows Vista. The feature allows you to create a temporary file named "ReadyBoost.sfcache" on a removable flash drive plugged into your computer's USB port.

    Background

    • A computer requires Random Access Memory, or RAM, to run programs. Before running a program, your computer loads it into the RAM, allowing itself to run the program faster than if it were accessing the program directly on the hard drive.

    Function

    • If your computer runs out of RAM, it uses virtual memory, found in a paging file, to compensate. An SFCACHE file provides additional virtual memory on a removable drive, allowing you to run programs faster without tying up your computer's hard drive.

    Running

    • You can create a SFCACHE file by first inserting a flash drive into the USB port of your Windows Vista or Windows 7 computer. Right-click on the flash drive's icon and select "Properties." Click the "ReadyBoost" tab and check the box next to "Use this device" in order to create a "ReadyBoost.sfcache" file.

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