On 26 Jun 2004 at 10:44, Matthew Seaman wrote:

> On Sat, Jun 26, 2004 at 02:38:28AM +0200, MICSKO Viktor wrote:
> > Is it possible to setting a *whole* disk read only? I mean the way linux
> > does it with "hdparm -r 1 device". So adding an -o ro parameter to mount
> > isn't enough, I want to be sure that the disk is unmodified.
> > 
> > (I have to access an existing raid of 8 disks using vinum without any
> > modified bit, because of the highly sensitive data. Any idea doing this
> > absolutely securely is welcome too)
> Hmmm... SCSI disks can be physically jumpered to be read-only.  I
> should think that ATA drives can be treated the same way.  Consult the
> manufacturers' data sheets for details.
Some time ago there was an article in the Elektor Magazine. 
They broke a line in the ATA cable and brought it to a switch on the front, 
with a pullup resistor on the disk side. 
The switch was labeled 'normal operation' and 'read only'
Could be the hard way to do it. Literally.

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