My Friend's Pen Drive, which was working well very well just few days ago, is not being recognized after getting used by a virus affected machine. Its not on fdisk -l or lsusb However in dmesg I can see the following:

[  977.300013] usb 5-2: new full speed USB device using uhci_hcd and address 2
[  977.420014] usb 5-2: device descriptor read/64, error -71
[  977.644023] usb 5-2: device descriptor read/64, error -71
[  977.860013] usb 5-2: new full speed USB device using uhci_hcd and address 3
[  977.980013] usb 5-2: device descriptor read/64, error -71
[  978.204013] usb 5-2: device descriptor read/64, error -71
[  978.420013] usb 5-2: new full speed USB device using uhci_hcd and address 4
[  978.828015] usb 5-2: device not accepting address 4, error -71
[  978.940015] usb 5-2: new full speed USB device using uhci_hcd and address 5
[  979.348013] usb 5-2: device not accepting address 5, error -71
[  979.348292] hub 5-0:1.0: unable to enumerate USB device on port 2
[ 1017.848015] usb 5-2: new full speed USB device using uhci_hcd and address 6
[ 1017.968012] usb 5-2: device descriptor read/64, error -71
[ 1018.192017] usb 5-2: device descriptor read/64, error -71
[ 1018.408014] usb 5-2: new full speed USB device using uhci_hcd and address 7
[ 1018.528012] usb 5-2: device descriptor read/64, error -71
[ 1018.752023] usb 5-2: device descriptor read/64, error -71
[ 1018.968012] usb 5-2: new full speed USB device using uhci_hcd and address 8
[ 1019.376019] usb 5-2: device not accepting address 8, error -71
[ 1019.488011] usb 5-2: new full speed USB device using uhci_hcd and address 9
[ 1019.896016] usb 5-2: device not accepting address 9, error -71
[ 1019.896308] hub 5-0:1.0: unable to enumerate USB device on port 2
[ 1049.984016] usb 5-1: new full speed USB device using uhci_hcd and address 10
[ 1050.104014] usb 5-1: device descriptor read/64, error -71
[ 1050.328014] usb 5-1: device descriptor read/64, error -71
[ 1050.544014] usb 5-1: new full speed USB device using uhci_hcd and address 11
[ 1050.664018] usb 5-1: device descriptor read/64, error -71
[ 1050.888019] usb 5-1: device descriptor read/64, error -71
[ 1051.104025] usb 5-1: new full speed USB device using uhci_hcd and address 12
[ 1051.512014] usb 5-1: device not accepting address 12, error -71
[ 1051.624101] usb 5-1: new full speed USB device using uhci_hcd and address 13
[ 1052.032014] usb 5-1: device not accepting address 13, error -71
[ 1052.032991] hub 5-0:1.0: unable to enumerate USB device on port 1

What these Errors actually mean and how Can I get this pen drive Back to work ??