我的U盘怎么了?

Manyoo

U盘插上后,指示灯一直亮着(以前不是的),也不能挂载,用dmesg|tail查看,输出如下:
[17191738.652000] usb 2-1: new full speed USB device using uhci_hcd and address 4
[17191738.772000] usb 2-1: device descriptor read/64, error -71
[17191738.996000] usb 2-1: device descriptor read/64, error -71
[17191739.212000] usb 2-1: new full speed USB device using uhci_hcd and address 5
[17191739.332000] usb 2-1: device descriptor read/64, error -71
[17191739.556000] usb 2-1: device descriptor read/64, error -71
[17191739.772000] usb 2-1: new full speed USB device using uhci_hcd and address 6
[17191740.180000] usb 2-1: device not accepting address 6, error -71
[17191740.292000] usb 2-1: new full speed USB device using uhci_hcd and address 7
[17191740.700000] usb 2-1: device not accepting address 7, error -71
请问这是怎么了,windows下也不行了,是不是U盘坏了?
高手指点一下,多谢了.