Drive changes to read only

I am new to mac. I have a new 27" IMac. I purchased this computer strictly for photo processing
I have 3 external drives
1. Time Machine backup - Seagate 3TB  - No problemn with this drive right out of the box
2. Photo Drive - Seagate 2TB Firewire drive- Photo library is 1.4TB
3. Original Photos -Seagate 2 TB USB drive Small amout of data but have used this for backup while reformating the photo drive
1TB Internal drive that only contains the OS and Programs. Mainly Adobe Lightroom and Photoshop
The Photo Drive was purchased as ready for PC or Mac
I pluged it in and it worked just long enough to load all my photos and get things organized.
The 2TB Original Photo drive was originall used for PC and I discovered I could not write to this drive so I reformatted to OS Journaled.
Next, My main Photo drive became read only - Error message stated I need to refornat the drive - Error 36
I transfered all Photos to Original, Reformated Photos as OS Journaled and then transfered files from Origianl back to Photo
All sorded for a a couple of weeks then the Origial drive became read only and I have to format it again.
Since then, the photo drive has become read only two more times.
I just finished reloading the photo drive for the third time on Thursday. For the last 3 days I have been Importing new photos from several weeks of shooting.
All seemd fine untill today. I tried to create a folder and discovered the photo drive is once again read only. The Original photos drive is still read / write.
I have read everything I can online. It seems other people have had similar problems but I found no solutions.
Currently the photo drive info is as follows
Flormat Mac OS Extended - I'm sure I selected Journaled on the last format
Sharing and permissions
"You can only read" is at the top
followed in black text
     Paul (Me) Read & Write
     Staff Read & Write
     Everyone Read & Write - (I changed this after formatting and before reloading the drive thinking it might help)
     Ignore ownership is checked
I can unlock the pad lock Icon but I cannot change anything except I can uncheck and recheck Ignor ownership. However this still does not allow me to make any changes.
One clue I may have to offer
I use a small Seagate drive named Transfer Drive which I use in the field.
It is formated NTFS
I download photos from my photo cards to my PC notebook and back them up to the Transfer drive
When I get home I import photos from the Transfer drive to my iMac using Lightroom
This was the last action I performed yesterday. I performed 8 imports from the Transfer drive to My imac with Lightroom
Is it possible that importing from a NTFS drive to the external Photo drive is causing this problem?
I really need to solve this. It takes about 3 days for me to move my photo library and reformat the drive
Not to mention the fact that I am very worried about my photo files.
Thank you in advance
Paul McCroskey

There may be a solution here, but I would modify the instructions to say that if Verify disk shows OK, you don't need to go on to Repair.
https://discussions.apple.com/message/18266486#18266486
First, copy/paste, leave a space after -alO and drag Photos into the Terminal window and hit return.
ls -alO
If the output shows the uchg flag, the immutable (locked) flag, then run the following to remove it.
sudo chflags nouchg /Volumes/Photos
If that doesn't fix it, then Verify Disk. If that shows an error, then follow the instructions to copy the data elsewhere first, then run Disk repair. Sometimes, though this is rare, disk repair can make things worse.
(After removing the immutable flag -- if it proves necessary -- you may still have to go on and run the commands you tried earlier.)

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