Are you sure it is in 'mass storage'-mode? IIRC I had a Sansa MP3-player and I could only see it show up after holding down a button for more than 5 seconds and then connecting it to my pc.
I have it in msc mode.
Bus 004 Device 022: ID 0781:74c3 SanDisk Corp. Sansa Fuze V2 (msc)
Is there a way I can use the ID 0781:74c3 to mount the device?
]]>Bus 004 Device 028: ID 0781:74c3 SanDisk Corp.
So I know it's there, but I can't get past this output of dmesg:
usb 1-6: new high speed USB device using ehci_hcd and address 55
usb 1-6: device not accepting address 55, error -71
hub 1-0:1.0: unable to enumerate USB device on port 6
usb 4-2: new full speed USB device using uhci_hcd and address 29
usb 4-2: device descriptor read/all, error -84
usb 4-2: new full speed USB device using uhci_hcd and address 30
usb 4-2: device descriptor read/all, error -84
usb 4-2: new full speed USB device using uhci_hcd and address 31
usb 4-2: device descriptor read/all, error -84
usb 4-2: new full speed USB device using uhci_hcd and address 32
usb 4-2: not running at top speed; connect to a high speed hub
usb 4-2: unable to read config index 0 descriptor/all
usb 4-2: can't read configurations, error -71
hub 4-0:1.0: unable to enumerate USB device on port 2
usb 4-2: new full speed USB device using uhci_hcd and address 33
usb 4-2: not running at top speed; connect to a high speed hub
usb 4-2: unable to read config index 0 descriptor/start: -84
usb 4-2: chopping to 0 config(s)
usb 4-2: string descriptor 0 read error: -84
usb 4-2: no configuration chosen from 0 choices