Re: Re: Read-only USB scan

[Bhasker C V <bhasker@unixindia.com>]

Hi,

 hdparm -r1 /dev/sda
  works and I get this output when I read back the information with 
plain '-r'

  $ sudo hdparm -r /dev/sda

/dev/sda:
 readonly     =  1 (on)


Does this make it really read-only ?

My harddisk is having a PV and then a VG ... LV which if i mount, still 
is able to write to it ? [ VG activation is successful ]

(dont know if 'write' means really write a large file but I checked 
using touch command and I am still able to create the file)

My kernel is 2.6.21.1

Is there anything I am missing here ?


Ron Johnson wrote:
> <div class="moz-text-flowed" style="font-family: -moz-fixed">On 12/20/08 
> 12:32, Bhasker C V wrote:
> > Hi all,
> >
> >
> > I have a server where there is a USB SCSI disk with lots of important 
> > data.
> > The only problem is accidentally people try to understand some other 
> > similar ide-scsi disk (sdb may be) as the
> >  first one (sda) and delete data.
> >
> > I was going to find out if there is any method so that I can make a 
> > disk (a particular device) read-only. i.e in case
> > I insert this disk with very important data, I must be able to make 
> > this disk (may be scanned as sdX) as readonly
> > so that people are only able to see the partition, mount it and use it 
> > ratherthan try to accidentally delete data which
> > will result in disk reporting it as read-only
> >
> > [ PS: I am not referring a workaround of mouting a partition read-only 
> > which can still help, but i want the whole disk
> >   to be made read-only ]
>
> # hdparm -r
>
> You might have to crack open the USB enclosure and physically install 
> the drive in a PC in order for this to work.

--
Bhasker C V
Registered Linux user: #306349 (counter.li.org)
The box said "Requires Windows 95, NT, or better", so I installed Linux.