Let's check the device driver:
cl Start
cl Settings
cl Control Panel
cl System
cl Hardware
cl Device Manager
R-cl on the item to be checked. Click Properties.
That will tell you if the item is working properly.
To update the driver:
Start, Settings, Control Panel, System, Hardward, Device Driver
click the icon for the item you want
click the “update driver” button on the toolbar.
If it is o.k.:
- see if you accidentally moved the disk lock - it doesn't take much to move into "lock"
- you didn't try to put it in upside down, did you?
- when removing the disk, did you accidentally catch the metal plate and loosen it
Please check the device driver. If it is o.k., Restart and try again. I'd be interested to know if you can access your files.