this is the error I get.
Steves-MacBook-Pro:~ root# open /Volumes/OS\ X\ Install\ ESD/BaseSystem.dmg
LSOpenURLsWithRole() failed with error -10810 for the file /Volumes/OS X Install ESD/BaseSystem.dmg.
Steves-MacBook-Pro:~ root# id
uid=0(root) gid=0(wheel) groups=0(wheel),1(daemon),2(kmem),3(sys),4(tty),5(operator),8(procview),9(procmod),12(everyone),20(staff),29(certusers),61(localaccounts),80(admin),33(_appstore),98(_lpadmin),100(_lpoperator),204(_developer),398(com.apple.access_screensharing),399(com.apple.access_ssh),401(com.apple.sharepoint.group.1)
Steves-MacBook-Pro:~ root# ls -ld /Volumes/OS\ X\ Install\ ESD/BaseSystem.dmg
-rw-r--r--@ 1 root admin 487175853 Nov 12 15:29 /Volumes/OS X Install ESD/BaseSystem.dmg