Unable to copy file - access denied

[bookends623]

I am using Win XP, DOS window. I have two hard disks. When I use DOS to copy a file from C: to F: I get an "access denied" error message. What would cause such a message to be generated?

 

[AntiZig]

encryption/security protection on source files
C: drive not ready
F: drive write protected
etc

what is the F: drive you are trying to copy to? CD/flash/dvd/bd/hdd?