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Topics - HappyBlack

Hello there.

I've recently bought a used Komputerbay 1066x 64GB CF card for my 7D.

After receiving it, I checked whether previous user left something on it and voila: there it was, Magic Lantern files.  Quite a surprise.
Nevertheless, I thought I should format it.

But then I got: 'Windows was unable to complete format.'

And I can't do anything to change it. Unticking 'Quick format' doesn't help, nor does pushing the 'Restore device defaults'.
All files on the card are 'Read Only' and unticking it, clicking 'Apply' then 'OK' somehow doesn't work at all. They're still 'Read Only'. I can delete them using 'Shift+Del' - they disappear. Click 'Refresh' and there they are, again. Nothing changed.
I've tried using diskpart's commands: 'clean' and 'clean all'. According to it everything went succesful, but all the files are still there.
Formatting via the camera doesn't come up with any problems, though the card seems intact.

Neither can I copy anything to it. Just like with deleting, the item appears on the card but after refreshing - it's gone.
The same story with taking photos with it - after shooting, they appear in 'Preview'. But restart the camera - nothing there.

I ran CrystalDiskMark via PC and got admirable write and read speeds - but what for?

I'm using this card reader: click connected to a USB 3.0 port.

It seems like it's in a permament 'Read Only' state.

Is there anything I can do?
Or just simply return it?

Thanks for any help,
Cheers from Poland.