Permissions and problems with external HDD

Starting today I have been unable to copy anything to my 1T Seagate FA GoFlex external HDD. I can access the drive, I can copy files FROM the drive back to my Mac Mini, but I cannot copy anything to the drive. Whenever I try to copy anything I get the error "The operation can’t be completed because an unexpected error occurred (error code -50)." I have spent the last four hours doing an exhaustive search, and have tried every solution I've come.
Somehow, over the last few days, something has happened to change this external HDD--the permissions and possibly the format. I have been in Disk Utility and am unable to repair. I have tried accessing Disk Utility from startup and am unable to repair. I have also copied the content off of the HDD and have tried to reformat the drive, but I'm getting an error when I try this as well.
When I tried to verify the disk I got this error:
When I tried to repair the disk I got this error:
After copying all of the important files to other drives, I attempted to reformat and got this error:
Then I tried the secure option and got this error:
I did notice that when I click on the Erase tab, the format shows as "Mac OS Extended" but when I click on the RAID tab the format shows "Mac OS Extended (Journaled)". Shouldn't these match?
I have been using this external HDD for several years now and have never had a problem. This does coincide with the copying of some .mp3 files. Could this be the culprit? (I was unable to remove one zip folder of these mp3 files.)
The permissions for this external HDD seem out of whack as well:
It states "You can only read" but the admin account "MiniMel (Me)" sholws Read & Write.
I am completely stumped and irritated. Is there any help for this HDD or is it just failing? It was no where near capacity. Could the mp3 files have caused the problem? I think this is unlikely, the the timing is coincidental. Should I worry about this happening to the other external HDD and my HD where I copied the files so I could reformat?
Any and all help is greatly appreciated.

Thank you for your reply.
I tried that last night. When I tried to verify the disk from startup, I received this message:
when I tried to repair the disk I received this message:
After the second message, I moved what I needed off the external HDD and tried to reformat. Which led to the errors in my OP. So frustrating.
Message was edited by: web-betty (replaced screenshots)

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