Date: Wed, 30 Jun 2004 07:53:35 +0200 From: "Kjell Midtseter" <freebsd2@c2i.net> To: Matthew Seaman <m.seaman@infracaninophile.co.uk> Cc: freebsd-questions@freebsd.org Subject: Re: setting a disk read only Message-ID: <40E2717F.11339.5FEAA4@localhost> In-Reply-To: <20040626094422.GA73314@happy-idiot-talk.infracaninophile.co.uk> References: <Pine.BSO.4.58L0.0406260220270.27354@bazmag.sch.bme.hu>
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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. Kjell
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