After using Windows ReadyBoost, I cannot recommend it: I did not notice any performance enhancement…
I was using ReadyBoost on a SanDisk Cruzer Micro USB Flash Drive. I decided to cease using ReadyBoost, and use the drive for storage. I was unable to format the drive (I suspect ReadyBoost may have written to the drive too much: as with other types of storage, flash drives have limitations as to how many times they can be written to).
I contacted SanDisk for assistance. We traded a few messages about troubleshooting back and forth. After not being able to get it to work, I was told to send the drive to them…and they would pay for shipping! (I had to print the label, and package the drive.)
I always tell people, BEFORE purchasing something, inquire as to the return policy. I recommend you consider SanDisk for your memory and storage needs: I was not put through “support-hell”…I gave them the benefit of considering their suggestions, and they trusted I had done reasonable effort to resolve the issue.
When I plugged the new drive into a Windows XP computer, the U3 software launched…and seemed to be causing my computer to become unresponsive. I was able to remove the software, but it did not go very smoothly. I have an identical SanDisk Cruzer Micro USB Flash Drive with U3 software, and have had no problems with it.