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

[Carlos Checo]

Well what I mean is that by design is most probably not possible with
actual software. If such action would be made then you would see partitions
as separately folders. ( I guess )

On Mon, Sep 7, 2015, 1:02 PM Colin Watson <cjwatson at ubuntu.com> wrote:

> On Sun, Sep 06, 2015 at 10:56:08PM +0000, Carlos Checo wrote:
> > Hardware and software are two separate things.
>
> I'm aware of that (and could you have said this in any more patronising
> a way?).  However, it does not affect the explanation I gave in the mail
> you're replying to.
>
> > The disk is "mounted" entirely it's just that the disks says it has
> > two, one or more partitions.  The disk's description is read when
> > plugged. When you mount you're using the software part not the
> > hardware nature of the disk.
>
> The blockdev command is a piece of software.  It changes a piece of data
> stored by the kernel (which is also a piece of software) about the disk.
> When you attempt to write to a disk (hardware), it goes through the
> kernel's block device layer (software); the block device layer may
> refuse the write on the grounds that its policy for that block device is
> set to read-only.
>
> --
> Colin Watson                                       [cjwatson at ubuntu.com]
>
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