My external hard drive doesn't allow me to move files

Hi all,
I have a Seagate Backup Plus Portable Drive.  I recently erased it and formatted it to Mac OS Extended (Journaled) -- at least that's what I says when I "Get Info" on the drive.  My problem is, I have loaded some files on the drive but rearranging them doesn't work.  I created several folders, but when I try to move files into these folders, it instead recopies the selected files into the folder.  I just want it to move them, as it usually does on any drive I have ever used before, as the files are large in size and it's going to take a while to copy them every time I rearrange organization.  I'm not sure if this is related, but every time I make a change now on my drive, it asks for my Administrator password, which has never happened before.
Anyone have any ideas on how I can fix this?

Disk Utility - First Aid?
Do a Get Info on that drive and check permissions, are they changed for whatever reason?
Maybe use Disk Warrior and repair the directory on the drive? Best tool for that particular job, but costs $100.
What is your backup?  If you don't have a backup you are going to lose the data eventiually - guaranteed. If you maintain a good backup then these types of problems are not really problems. You can just erase the disk and copy the data back to it. Which makes them expected non-events. Without a backup you must hoppe you can fix whatever got messed up.
Rick

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