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The general option are not needed most of the time. They allow
for increase flexibility and security.
- Read-only
It is possible to protect a partition from writing. Even
the superuser won't be able to write there. This is seldom
use on normal hard drive partition though.
- user mountable
This option is generally used with the following one. It
is useful for removable media. It allows any one to
activate the connection at any time. Normally, only root
(the superuser) can establish a mount.
- Not mount at boot time
Especially useful for removable media. It prevent the system
from trying to establish a mount (and fail) at boot time.
- No program allowed to execute
It is a security feature, especially useful for removable
media. If you set the
user mountable
option on a
removable media, it allows any user to come and install
a set of files specially setup to give him full access
to your system (administrator privilege).
- No set-user-identifier allowed
Again a security feature. It is a compromise between full
access and the above option (No execution allowed).
By setting this option, the system will deny privileged
program their special rights. A privileged program
is one that switch the user to another identity while
it is running (generally root), allowing this user
to do special tasks only the supervisor can do.
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