I tried creating a new file on my external hard drive and I was very confused when I got a message saying it failed. It turns out Vista sets the default file permissions to not allow modifications on external hard drives.
To fix this, you can:
- Right clicking on the drive to bring up the context menu and select Properties.
- Go to the Security tab.
- Click on Edit, which pops up a UAC dialog.
- And then edit the permissions.