My Comment #84 was a wee bit to quick - sorry. I had wrong (interpreted) 
timestamps in the kernel log, so I saw log records seemingly from yesterday, 
but they are from today !
So I had to continue experimenting, and this command (which you could run for 
every boot) should detach the device, hence power it off and you avoid the 
flooding of messages:
   udisks --detach /dev/sdb
where sdb is the device causing the messages:
    [Sat Nov 15 23:58:58 2014] sd 5:0:0:0: [sdb] Assuming drive cache: write 
through
    [Sat Nov 15 23:59:49 2014] sd 5:0:0:0: [sdb] Test WP failed, assume Write 
Enabled
    [Sat Nov 15 23:59:49 2014] sd 5:0:0:0: [sdb] Asking for cache data failed
If you are unsure of which devices you have 'available' there's several tools 
available, but these seems to be informative:
   udisks --enumerate-device-files
   udisks --show-info /dev/<your device, like sdb for me>
and also
   lsusb -v

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https://bugs.launchpad.net/bugs/925760

Title:
  Constant warnings from the kernel: Test WP failed, assume Write
  Enabled

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