USB thumb drive stopped working

[Thomas Milne]

I last used the drive to plug into my PS3 with some videos to watch.
The next day I plugged it into my computer and nothing. I took it to
work tonight, and it works fine on my Ubuntu machine there.

When I plug it into my computer at home, /var/log/messages shows this:

Mar 17 00:32:24 node1 kernel: [301499.628077] usb 1-5: new high speed
USB device using ehci_hcd and address 66
Mar 17 00:32:25 node1 kernel: [301500.196030] usb 1-5: new high speed
USB device using ehci_hcd and address 67
Mar 17 00:32:25 node1 kernel: [301500.764025] usb 1-5: new high speed
USB device using ehci_hcd and address 68
Mar 17 00:32:26 node1 kernel: [301501.292026] usb 1-5: new high speed
USB device using ehci_hcd and address 69
Mar 17 00:32:27 node1 kernel: [301501.828028] usb 4-1: new full speed
USB device using uhci_hcd and address 23
Mar 17 00:32:57 node1 kernel: [301532.372026] usb 4-1: new full speed
USB device using uhci_hcd and address 24
Mar 17 00:33:28 node1 kernel: [301562.916022] usb 4-1: new full speed
USB device using uhci_hcd and address 25

...but nothing is mounted, and it cannot be seen even by gparted.

What else can I check on here?

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