It's a Linux issue. Or, many would say, a Microsoft issue, as Microsoft will not release full NTFS specs and many believe is actively working to keep Linux from working will with the NTFS file system. As I said, it was the case back when your 3.x version of Knoppix was made. Some users now trust the newer versions of Linux (although even many of them warn you to have your data backed up before taking the risk). I don't yet trust it. If you do, then try Knoppix 5.1.1. I'll stick with making transfers across a network, which is safe.