XP SP3 My home pc is very slow in copying file from HD to USB port. It took 50 minutest copy a 1.2GB from HD to USB flash key. I thought the problem of my USB key, but it's not. I tried to copy 2.5 GB file in my work pc from USB(my colleague's USB key) to USB(my current USB key), took about 10 minutes. My HD is fast, so should not be the problem. I tried a differenet USB port in my home pc, still very slow. How do I know which USB port is USB 2.0?