setting a disk read only

[MICSKO Viktor]

Hi,

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)

Thanks,
Viktor.