Comment 11 for bug 1532062

more info here, and I'm going to merge Robert's change.
On a system the kernel team has, the value of 'removable' changed even from one version of a kernel to another.
$ uname -r
4.2.0-27-generic
$ cat /sys/class/block/sda/removable
0

But on 4.4.0-2-generic that same sysatem shows that drive as removable.

so, that just gives more evidence that its nto terribly useful.