Mac – Hard drive read only access with Mac

Do you need permissions to exist on this volume? If not use the "Ignore permissions on this volume" checkbox, and that will take care of all of the problems.

Also - I would run disk utility's verify to see if there are any problems with it.

If you are familiar with terminal you can use the following command;

sudo chown -R username directory

username: your username directory: the folder in which the files you want to copy are located

PS Requires an administrator's password