|I agree that it is unlikely all your cards a flash drives have failed. More likely the file systems have been corrupted.|
I have also ejected them via the taskbar “safely remove hardware”.
Using the “safely remove hardware” function is critical to protecting the file system on any disk. Especially larger capacities. If a disk is removed prematurely it will probably corrupt the file system.
You can check to see if that is your problem by viewing the cards (disks), in Windows disk management. If the file system is shown as "RAW", then the file system has been corrupted.
The data is usually still intact but Windows doesn't know how to find it. There are a couple of utilities that can repair corrupt file systems. Testdisk is one and Easeus Partition Recovery is the other. Get both from the links below. Testdisk is more comprehensive but a little harder to use.
Post what you find listed in Disk Manager for your cards.