Capacity? right click in my computer.
Speed? It tells you when you copy something, beyond that no. For Vista Speedboost Vista will self determine if the drive is capable. If the MFR quotes it is then Vista will come back a a positive.
Data Corrupted? If you copy a file to the pen and it can be read then no corruption is there?
As for copies of copies will there used to be some degradation (that's something I was taught years ago) but I'm sure it's not the case now.