Just a tip if a thumb drive stops working all of a sudden:
My symptoms were the drive would light up for a few seconds when inserted, but the device manager wouldn't detect it. It was listed in lsusb and dmesg revealed the device was detected and assigned a device number. I was even able to re-format it but this didn't change the behavior.
Eventually. I verified the partition type with sudo fdisk -l and found it was set at linux RAID type fd rather than regular linux type 83. I don't know how it happened, but a simple partition type change and partprobe and device manager popped open immediately.
My symptoms were the drive would light up for a few seconds when inserted, but the device manager wouldn't detect it. It was listed in lsusb and dmesg revealed the device was detected and assigned a device number. I was even able to re-format it but this didn't change the behavior.
Eventually. I verified the partition type with sudo fdisk -l and found it was set at linux RAID type fd rather than regular linux type 83. I don't know how it happened, but a simple partition type change and partprobe and device manager popped open immediately.
if you do not , then nobody dose ...... 
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