When I connect the drive to VirtualBox (either to a Xubuntu or a Windows 7 VM), VirtualBox correctly makes the drive accessible to the guest OS. But in both cases (Linux and Windows) it ends up being recognised as a drive with no media inserted. In Windows, the drive appears but clicking on it pops up a request to insert media. In Linux dmesg shows /dev/sdb being detected, but no partitions are found. Trying to partition the drive using cfdisk shows the "No medium found" error message. Gparted doesn't even list /dev/sdb as an option for partitioning.
dmesg output:
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[ 28.654211] usb 2-1: new SuperSpeed USB device number 2 using xhci_hcd
[ 28.680737] usb 2-1: New USB device found, idVendor=0781, idProduct=5580
[ 28.680741] usb 2-1: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[ 28.680743] usb 2-1: Product: Extreme
[ 28.680745] usb 2-1: Manufacturer: SanDisk
[ 28.680746] usb 2-1: SerialNumber: AA010118161550470319
[ 28.708104] usb-storage 2-1:1.0: USB Mass Storage device detected
[ 28.708196] scsi host3: usb-storage 2-1:1.0
[ 28.711502] usbcore: registered new interface driver usb-storage
[ 28.717525] usbcore: registered new interface driver uas
[ 29.708039] scsi 3:0:0:0: Direct-Access SanDisk Extreme 0001 PQ: 0 ANSI: 6
[ 29.712811] sd 3:0:0:0: Attached scsi generic sg2 type 0
[ 29.718321] sd 3:0:0:0: [sdb] Attached SCSI removable disk
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vm@xubuntu:~$ lsusb
Bus 002 Device 002: ID 0781:5580 SanDisk Corp. SDCZ80 Flash Drive
Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 001 Device 002: ID 80ee:0021 VirtualBox USB Tablet
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
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vm@xubuntu:~$ sudo cfdisk /dev/sdb
[sudo] password for vm:
cfdisk: cannot open /dev/sdb: No medium found
Thanks in advance for any advise anyone might be able to give me.