USB is plugged in, says not formatted devce

I'm under WIN XP Pro, when I plug my USB key, Windows assigns it a drive letter, but I get an error "unformatted device, do you want to format it now."
Tried the USB in3 other machines and it works very well. I tried 3 other USB drive also in first machine and received the error, weather, I used the front USB ports or rear and when I plugged the other 3 machines that they all work very well.  All the other machines are running XP Pro. Tried to look to the top of problem on the internet, but I couldn't find an answer!
SO all 4 USB readers have any info on them and files are accessible on 3 machines, but this 1 machine is not all files, so USB drives are OK, but what is the problem on this 1 machine?

Hi mannymerc,

  1. Did you the latest changes on the computer?
  2. When was the last time the car was working very well on the first computer?

Method 1

I suggest that you uninstall and reinstall all USB controllers on the computer and check if it helps.

(a) click Start, click run, type sysdm.cpl in the Open box, and then click OK.

(b) click on the hardware tab.

(c) click the Device Manager button.

(d) expand Bus USB controllers.

(e) right click on each device under the Bus USB controllers node and then click Uninstall to remove them one at a time.

(f) restart the computer and reinstall the USB controllers.

(g) connect the removable USB storage device and perform a test to ensure that the problem is solved.

Method 2

If the previous step fails, then check out the articles below and check if that helps.

A computer that is running Windows XP cannot detect a USB, an Apple iPod flash drive or an external hard disk drive

http://support.Microsoft.com/kb/925196

Why my computer does not detect my new USB device when I run Windows XP or Windows Server 2003?

http://support.Microsoft.com/kb/314634

Tags: Windows

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