I have three 16Gb Readyboost-enabled USB memory sticks from Play.com, and I've just discovered that even though I've quickformatted them all from Win7 with the same settings and choosing default values, that at least one of the devices is reporting a smaller memory capacity. Why is that? Also, I know some memory is lost to the OS and the filing system on the stick so I'm not surprised I'm not getting the full capacity mentioned, but why would the capacities vary from (supposedly) identical sticks? Also, if I chose to format from FAT32 (which these are as default) to NTFS, would it cause more problems or even damage to the sticks? And would it only take effect if I checked off "Quick Format"?