On Tue, Mar 6, 2018 at 3:04 AM, Russell Senior
<russ...@personaltelco.net> wrote:
> On Tue, Mar 6, 2018 at 3:01 AM, Jim Karlock <jjkarl...@gmail.com> wrote:
>>
>>> My initial attempt to google this was unsuccessful (most people point
>>> out the write protect tab, not my problem).
>>
>>
>> Bad switch on the write protect tab? (The tab operates a tiny switch.)
>
> Nope.
>
> I can turn the switch to lock and it mounts the device read only very
> clearly.  The behavior I observe is that it happily writes /dev/zero
> over the block device, but then when I read again, the old data is
> still present.

For example, if I flip the tab to write protect tab to "Lock", I get this:

# dd if=/dev/zero of=/dev/sdc status=progress bs=1M
dd: failed to open '/dev/sdc': Read-only file system
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