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Need to know how to force read only mode for any external drive attached to my mac.

Due to some restrictions I can't let my users mount external HDD's/USB Flash etc. in RW mode. Onle read is allowed, so how can I do that without OS X Server installed?

Posted on Apr 25, 2012 2:35 AM

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Posted on Apr 25, 2012 3:39 AM

Have a look at this little utility


https://github.com/aburgh/Disk-Arbitrator

13 replies

Oct 11, 2013 11:08 PM in response to Alberto Ravasio

Hi there,


I spent too much time finding how to recover my user profile on this forum, because from some time it is separated from my apple ID, but it uses same email 🙂



Well, this solution (I mean Workgroup Manager being locally installed) still work well, except one thing: if your "limited" user will reboot your Mac - he will have a full access to the hard disks connected to this, because at booting stage OS will mout everything using root privileges... Any idea how to prevent OS from doing this?

Oct 12, 2013 6:13 PM in response to idimch

Physical access trumps all security. If you were using true managed accounts such as with OS X Server or Active Directory, then you can control the machine's access to your network and the users on it. A user could still reformat the hard drive, but then they couldn't reconnect to the server and you would know something was up.

Oct 12, 2013 10:43 PM in response to etresoft

Well, actual knowing about an accident is not enough for company where I'm working. If somebody will steal pre-release version of feature we producing, the penalties could be very impressive. In Windows environment I did that block what I'm talking about - using some antivirus software 🙂 But with Mac I still did not find perfect solution, which will fit all requirements...

Oct 13, 2013 8:34 AM in response to idimch

Windows is no different. If someone had physical possession of that Windows machine and the intellectual property residing on it, they could have copied that off if they were determined enough. This is not a question of differences in operating sytems, but the pragmatic realities of mobile devices and human beings. All you can really do it make the task more difficult for the hacker. But if you are unwillng to try easy solutions like OS X Server, then I doubt you would be interested in 3rd party full-disk encryption requiring CAC card access. You can have as much security as you are willing to pay for up to a limit of just under 100%. You have to combine the technological solutions with social solutions like references and background checks. Even people who specialize in such things get burned from time to time.

Need to know how to force read only mode for any external drive attached to my mac.

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