My bb memory card that contains so much that I can't afford to loose suddenly developed a fault,saying card detected some errors that if I would like to repair it,if I click yes,it still tell me repair fail

My only hope now is that I put the memory card in my small nokia and it was fine but when I put back in bb the problem persist,what do I do to repair this mem card without loosing things inside

First of all, and I can't stress this enough, backup/copy you files to another device, maybe a laptop, flash drive, RW-DVD etc.

Then format the mem card using your bb.

BB uses a different file format system, and I am thinking maybe you or somebody or your small nokia phone formatted the card with to different file format system.

That, ir the memory card has some bad/corrupt sectors during manufacturing.

Hopefully, a simple format solves the issue, but please, back up your files, especially critical documents.

Use a cloud service like dropbox, google drive etc, if you don't have any physical alternative