Is it possible to mount an entire disk device read only?

Karl Auer kauer at
Sun Sep 6 09:37:08 UTC 2015

On Sun, 2015-09-06 at 11:18 +0200, Petter Adsen wrote:
> Karl Auer <kauer at> wrote:
> > That is, can I have a read-only /dev/sdb?
> Check the manufacturer info, I've seen drives that have jumpers to do
> just that.

I know - I used to have several, back in the day. But I haven't seen
that for a long time now.

> If it's possible to do in software I have no idea, but it's an
> interesting question.

I wonder what effect it would have on journaling file systems, on drives
that automatically remap bad sectors and so on...

Regards, K.

Karl Auer (kauer at

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