Why can't my Flash drive for readyboost?

I tried a whiff of 221 mb usb flash drive so it says the size of the unit must be greater than 256 MB and then I tried a whiff of 3.5 GB usb flash drive, but he said that the device does not have the performance characteristics required for use in speeding up your system.

ReadyBoost requires the player to have a fast enough speed read/write. Not all flash drives are fast enough.

In some situations, you might not be able to use all of the memory on your device to speed up your computer. For example, some flash memory devices contain both slow and fast flash memory, but ReadyBoost can only use fast flash memory to speed up your computer.
http://Windows.Microsoft.com/en-us/Windows7/using-memory-in-your-storage-device-to-speed-up-your-computer

Tags: Windows

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