When using knoppix, i cannot write to my hard drives, or my thumb drive. Although I am able to read from my hard drives just fine. I can only boot knoppix with the "nodma" command, how does this command effect my computer?

I get the following hard drives when trying to create a new folder on a hard drive or thumb drive.
Error - Konqueror
Could not make folder /mnt/hdd1/New Folder
I get this error when trying to copy a file to my hard drive or thumb drive.
Information- Konqueror
Could not write to file /mnt/hdd1/test.txt