Can't unlock 2 of 4 disks on Mac Pro

Hello,
It is my first posting
On a Mac Pro
I have 2 hard disks (they are not startup disk) that are locked and I can't unlock them. I notice that when I try to trash 2 files, They stay on the disk. I get info on the file I unlock the files still I can't trash them, I got the sound of the trash. After that I discover the disks were lock, so I got info and I notice at the bottom of general I have : box Shared folder, but I don't have : box lock, I think I saw the box lock before.
On sharing and permission I have you can read only>
I have 3 names
System read and write
Admin read and write
Everyone read and write
With the lock open I can't even change everyone for read only
Also on both disk I have under the buttons and the lock
Box ignore ownership on this volume , I don't have that on my startup disk info
thks for any help
Mitsou

Hello again,
I solve my problem : saved the content of disks then erase them, they are unlock now.
But still I don't understand how that happens, and what to do in the future if that happens again.
So if someone find it out I will appreciate to know.
Thanks.
Bye

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