i/o Device error message

[MrIncredible]

I keep getting the above message when trying to transfer data onto a micro sd card using a micro sd card reader in a usb port.
I have had no trouble doing this in the past and have just dragged n dropped.
after googling and checking the settings and such as advised i am still getting the same error message.
Could it be the card reader itself thats at fault?
any ideas?

[ChuckFickens]

Try formatting the card (this will delete everything off the card)

[MrIncredible]

just tried that chuck still the same message, it thinks about it for about 30 seconds in which my pc freezes up then this error message appears! I have tried using two different sd cards as well, same message each time.

[MrIncredible]

also I cant transfer files either onto of off sd card but I still can delete indiviual files off sd card which go straight into my recycle bin!

[barney15c]

try another pc / laptop with a different operating system...or try carefully cleaning the contacts on the card in case they are dirty.