How to turn off ready boost

Try re-formatting.

Right click the thumb drive from 'My Computer' and select 'Format...' from the menu. Select your flavors, quick format, and start. Eject the thumb drive after formatting is done, pull it out, put it back, and check to make sure ReadyBoost let go of it.

At desktop press and hold the windows key + E which opens computer. Mouse over to the drive being used for Readyboost and right click and open "properties" at the bottom. Left click Readyboost and disable or "do not use this device".

Formatting won't help as Windows will keep using the device until the feature is disabled.

BTW - Double posting is against the rules.

As I said, the do not use, (options are not showing ) When I go to properties / readyboost, it just says readyboost cannot be used because of writers block. And I can't get the 3 options window to get out of it. A nightmare, when I get my next mem.stick I will never use readyboost again, I will keep it storage. Once you dedicate to readyboost, you are dedicated for life it seems.

Readyboost is useless,you won't miss anything.

True enough but he can't use the flash drive because Windows is dedicating it to readyboost.

@OP

Open start and type "services" and hit enter. Scroll down to "superfetch" or "readyboost" - right click and disable.