Please Insert a Disk into Drive Error In Windows

[hyielo]

I’m Korean. I have 3 Sandisk microSD cards. 1gb, 8gb and 8gb. 8gb cards are not recognized by my mobile phone. It is available on my phone indeed. and 1gb is recognized by the phone. So I insert all of it in my computer. Also the computer recognize only 1gb, not two of 8gb. And it show me the error something(It is also Korean, the translation is ‘Please Insert a Disk into Drive’) I can’t solve this problem. Please help me…