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The thumb drive might have some fault. Plug it in other OS mainly windows XP and Linux. If still same problem persists after tried in Linux, problem is with pen drive. You can ask for a replacement from the dealer as it has guarantee for 5years.
We have all had it, yesterday it was fine now it says it doesn't recognise ya USB device.. AARrrgg. Well there are various way to try to fix. Now providing your USB aint Kaput then this works like 99 outa a hundered.Simply Remove and reinstall all USB controllersTo remove and reinstall all USB controllers, follow these steps:
Click Start, click Run, type sysdm.cpl in the Open box, and then click OK.
Click the Hardware tab.
Click the Device Manager button.
Expand Universal Serial Bus controllers.
Right-click every device under the Universal Serial Bus controllersnode, and then click Uninstall to remove them one at a time.
Restart the computer, and "Windows" will then automatically reinstall the USB controllers.
Plug in the removable USB storage device, and then test to make sure that the issue is resolved.
Remember with USB devices. FIRST, install software/drivers, then insert USB device SECOND.
have you tried using it on another computer? if its a plug and play device and it works on another computer, the problem may be with your computer. you have to first try this device on another computer to see if it works or not.
What I would recommend you to do is to make sure that your device is under MTP mode instead of MSC...to do that go under menu,setting, usb and then there should the two mode listed there...then you want to plug your device in the back of your computer..not in the front..tghat is very important....once you do that..open up your windows media player...click on your start thee sync panel..if your device is recognize properly it will be showing there on the right side..and if its not listed properly, it will say connect a device..if thats the case..click on your start menu right click on computer and then click on propetties, click under hardware and then device manager..your device should be showing there...check under disk drives to see if your device is showing there and if it doesnt you want to right click and hit uninstall...we dont want your device to be under disk drive ..we want it to be under windows portable device...once you uninstall it...go to http://www.sandisk.com/DriverDownload/index.asp and find the driver for your device..and then connecct the device on the back of your computer...it should work properly..if you are still having any problems..let me know..i would be more than happy to assist you.. Please rate accordingly Thank you Computerrep
Try removing the device from device manager, then reboot. Windows should then re-detect the device and re-install the drivers for it. If that doesn't work, try the device on another computer. If it still doesn't work, it's probably defective.
corruption. not fixable. device can not tell os what it is. that is the most basic of functions. without id, it can not set configuration needed to access data. probably already lost data anyway. replace is about the only option.
Try plugging your USB cable (attached to your player) into the computer before you turn the computer on and boot up . . . I had this same problem with a flash drive that the computer would not recognize if I plugged it into the computer while the computer was already on.