Disk not readable message when using If I try to use either of the two usb ports on my macbook pro, I get the following message "The disk you inserted was not readable by this computer." and I don't have a disk inserted anywhere... I have the option to eject or ignore the message, and either option does not solve the problem. Can't use the usb ports without getting this message.
From your question it is not clear what you put into those USB ports. Memory sticks appear to the system as a disk, so the message you quoted might be caused by a memory stick that had been formatted in a file system your Mac does not know (possibly from a Linux computer?).
If you want to widen your possibilities, you might consider installing OSXFUSE. But I would appreciate if you first clarify what you mean by "use either of the two usb ports".