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From: Serhat Sevki Dincer <jfcgauss@gmail.com>
Date: Thu, 13 Sep 2018 19:15:21 +0300
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Subject: Re: btrfs convert problem
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> -1 seems to be EPERM, is your device write-protected, readonly or
> something like that ?

I am able to use ext4 partition read/write, created a file and wrote
in it, un/re mounted it, all is ok.
The drive only has a microusb port and a little led light; no rw
switch or anything like that..