How do I authenticate my external hard drive?

I've been using my external hard drive for a few months now without any problems opening, saving, or moving files. Just recently I had a new hard drive put into my MacBook and I used the Migration Assistant to transfer my latest backup over to the new hard drive. My problem now is when I go to move or remove files from my external drive, it says I have to authenticate it. I'm tired of putting my password in, as I never had to do this. I've checked the settings for the drive and they were fine. How do I go back to saving and moving files WITHOUT having to put my password in?

I had my hard drive plugged into Apple's 2nd generation Airport Extreme and was using it for storage. for some reason when I reformatted the drive it would not show up on the desktop when I would connect to the drive, furthermore at some point when I connected to the drive it would not show anything. I tried unlocking the drive setting permissions and I ended up worse having an alias type file on my desktop that I had to route and all that stuff. but by moving the alias to connect to the files back to the drive folder it would come with that error of the click to authenticate. I could reach the files but not like I wanted to with ease. so just now I tried one last thing moving the folder alias to get to the actual drive into the macintosh HD on the start screen/ desktop, by dragging the folder to there and back into the file system maverick gave me the option to authenticate and now everything is back to normal aside from not being able to see the Wi-Fi drive on my desktop when I am connected to it.

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How do I authenticate my external hard drive?

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