I am using Windows XP Pro SP1. The floppy drive seemed to quit working, but device manager says it IS working. The problem is whenever I try to use a floppy disk I get an error message saying: "a:\ is not accessible. No ID address mark was found on the floppy disk" It doesn't matter which floppy disk I try to use...NONE of them will work. It happens even if I put in a blank diskette. I have not made any changes to my system or done anything else that I can think of to cause this. I tried unisntalling and reinstalling the floppy drive device driver, which didn't make a difference. I also tried reformatting a diskette on another XP computer (full format not quick format), then placed a .txt document on the disk. On THAT computer it can see/read the floppy and the text document just fine, but not on MY computer. Whenever I insert the floppy and try to do anything I get the same error message above.