Windows 10ConfigurationPrograms and Features

ReadyBoost in Windows 10


ReadyBoost is a Windows feature to increase random read access speed to the hard drive, that can speed up your computer. It has been introduced in Windows Vista and was significantly improved in Windows 10. For instance, in Windows 10 it is possible to use all the flash drives that are connected to your computer for ReadyBoost at once.

General information

ReadyBoost in Windows 10 allows you to use your flash memory devices to speed up you computer.

You can adjust how much space on your flash memory device may be dedicated to ReadyBoost and store your data in unused space. The data, that is contained on a flash drive should not be deleted or corrupted when you start using the device for ReadyBoost.

Software requirements

To use ReadyBoost in Windows 10 make sure that SuperFetch is enabled. ReadyBoost won't work if the SuperFetch service is stopped or disabled.

Hardware requirements

To use ReadyBoost you need a USB flash drive or flash memory card with the following capabilities:

  • 1-32 GB of free space;
  • Data transfer rate of at least 3.5 Mbit/s;
  • USB 2.0 support (or higher).

Most of the modern flash memory devices may be used for ReadyBoost. If a device cannot be used, Windows 10 displays the error message.

For best performance results it is recommended to use a flash memory device with available space of at least double the amount of memory (RAM) in your computer, and preferably four times as much memory.

On a single computer you can use from 1 to 8 flash memory devices synchronously (up to 256 GB total).

When ReadyBoost is enabled Windows 10 creates the ReadyBoost.sfcache file in the root of the flash memory device. To use more than 4 GB on a single flash drive, you need to format it with the NTFS file system.

If at least one solid-state drive (SSD) is connected to your computer, then ReadyBoost might be unavailable, because some solid state drives are working faster than flash memory devices and unlikely to benefit from ReadyBoost.

Enable ReadyBoost

1. Connect a flash memory device to your computer.

2. Open the This PC folder, right-click on the flash drive and in the appeared context menu select Properties.

3. In the drive properties window switch to the ReadyBoost tab.

4. Click Use this device and move the slider to adjust how much space on the device you are ready to give ReadyBoost.

Use this device

Note. If you click Dedicate this device to ReadyBoost, then readyBoost takes all the available space on the device (not more that 32 GB).

Dedicate this device to ReadyBoost

5. Click on the OK button.

Note. The specified amount of space may be changed at any time using the same slider.

Disable ReadyBoost

1. Put a flash memory device, that is allowed to use for ReadyBoost, into your computer.

2. Open This PC, right-click on the flash drive and select Properties.

3. Go to the ReadyBoost tab.

4. Click Do not use this device.

Do not use this device

5. Click OK.


Sometimes on some flash memory devices the following error message appears: The device cannot be used for ReadyBoost. [The device does not have the required performance characteristics for use in speeding up your system]. If you faced it, despite the fact, that that device was succesfully used for ReadyBoost in the past, try to click Test Again. In the most cases that's all you need to use the device again.