just [f1]ed and read about it yea its true..
quote from [f1]:
Using memory in your storage device to speed up your computer
Windows ReadyBoost can use storage space on some removable media
devices, such as USB flash drives, to speed up your computer. When
you insert a device with this capability, the AutoPlay dialog will
offer you the option to speed up your system using Windows
ReadyBoost. If you select this option, you can then choose how much
memory to use for this purpose. However, there are some situations
where you may not be able to use all of the memory on your storage
device to speed up your computer.
Some universal serial bus (USB) storage devices contain both slow
and fast flash memory, and Windows can only use fast flash memory
to speed up your computer. So if your device contains both slow and
fast memory, keep in mind that you can only use the fast memory
portion for this purpose.
The recommended amount of memory to use for ReadyBoost acceleration
is one to three times the amount of random access memory (RAM)
installed in your computer. For instance, if your computer has 512
megabytes (MB) of RAM and you plug in a 4 gigabyte (GB) USB flash
drive, setting aside from 512MB to 1.5GB of that drive will offer
the best performance boost.
