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Sometimes when a flashmemory stick or USB external hard drive fails because it was not removed fromthe USB port properly. If the device is removed byjust pulling it out of the USB port, it can cause the flash device to fail, youmust click on the Safely Remove Hardware icon on the Task Bar and select thedevice you wish to remove and only do so when instructed to do so
When the flash memoryUSB hard drive device appears to malfunction it maybe possible to restoreit by reformatting it. Insert the flash or USB hard drive into the USB port then Click on Control Panel - AdministrativeTools - Computer Management - Disk Management.
Then right click on Disk 1removable drive and click Format. After the flash drive has been formatted itwill indicate that it is Healthy.
try to open in another computer see if it opens there n get ur data first coming to the unknown device issue, firstly insert ur pendrive to usb slot firmly then refresh your comp for about 5 times wait till the drivers are installed open "my computer" n see if the pendrive icon is displayed if its displayed double click n start using . If the above procedure does not work first time do repeat it ur pendrive will work for sure
ic, maybe the usb port of your friend's pc is defective which may cause your pen drive to malfunction, probably a shorted usb port. or just maybe your pendrive was dropped by your friend which damage the drive, it happened to me too before.