I guess this might not be fixable at all. Getting spin speed/SSD or not
is done with this command (see
http://comments.gmane.org/gmane.linux.kernel.bcache.devel/554):

$ sudo hdparm -I /dev/sda|grep Rot
        Nominal Media Rotation Rate: Solid State Device

This is my internal SSD hard drive. I tried with a rotational hard drive
attached with USB, but get no information about that. Same with a USB
memory stick. This leads me to believe that it is not possible to detect
if a USB connected drive is SSD or not, and the kernel assumes
rotational drive as default.

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https://bugs.launchpad.net/bugs/499237

Title:
  Doesn't detect usb flash drive as SSD

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