I have a PC Windows XP/3 and a San Disk "Cruzer" 8 GB memory stick. I tried to copy data onto the memory stick which I thought was large enough and got the message that there was not enough space. The copied data was circa 3.7 GB with a little bit of space left. How can one tell what the cluster size is? How can one change it. I would like to copy circa 6 or 7 GB onto a 8 GB stick or is the "easiest" way to buy a 16 GB stick? I have many not very big files.