Don't have permissions to see my external drive contents

can anyone help? all of a sudden, i can't access the files on my external drive. it gives me the message "...you don't have permission to see its contents"
i tried every option in disk utility, but the "repair disk permissions" is grayed out.
can someone help me?

Hi
What format is the external HD formatted in?
Go to Applications -> Utilities -> Disk Utility, and look in the bottom left corner.
If the drive is formatted as FAT or NTFS, then you will not be able to repair disk permissions. If the volume is formatted as FAT, then you are unable to assign permissions at all, so you have a real problem in that case.
Report back with more info.

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