SELinux is preventing /usr/libexec/colord from 'read' accesses on the directory /media/OS.

*****  Plugin restorecon (99.5 confidence) suggests  *************************

If you want to fix the label. 
/media/OS default label should be mnt_t.
Then you can run restorecon.
Do
# /sbin/restorecon -v /media/OS

*****  Plugin catchall (1.49 confidence) suggests  ***************************

If you believe that colord should be allowed read access on the OS directory by default.
Then you should report this as a bug.
You can generate a local policy module to allow this access.
Do
allow this access for now by executing:
# grep colord /var/log/audit/audit.log | audit2allow -M mypol
# semodule -i mypol.pp

Additional Information:
Source Context                system_u:system_r:colord_t:s0-s0:c0.c1023
Target Context                system_u:object_r:fusefs_t:s0
Target Objects                /media/OS [ dir ]
Source                        colord
Source Path                   /usr/libexec/colord
Port                          <Unknown>
Host                          (removed)
Source RPM Packages           colord-0.1.7-1.fc15
Target RPM Packages           
Policy RPM                    selinux-policy-3.9.16-26.fc15
Selinux Enabled               True
Policy Type                   targeted
Enforcing Mode                Enforcing
Host Name                     (removed)
Platform                      Linux (removed) 2.6.38.6-26.rc1.fc15.i686 #1 SMP
                              Mon May 9 20:43:14 UTC 2011 i686 i686
Alert Count                   1
First Seen                    Wed 22 Jun 2011 05:32:16 PM MST
Last Seen                     Wed 22 Jun 2011 05:32:16 PM MST
Local ID                      98b156ce-7d68-4123-b787-40c0b373927d

Raw Audit Messages
type=AVC msg=audit(1308789136.638:529): avc:  denied  { read } for  pid=18588 comm="colord" name="/" dev=sda1 ino=5 scontext=system_u:system_r:colord_t:s0-s0:c0.c1023 tcontext=system_u:object_r:fusefs_t:s0 tclass=dir


type=SYSCALL msg=audit(1308789136.638:529): arch=i386 syscall=access success=yes exit=0 a0=996d4e0 a1=5 a2=4b07a328 a3=996d4c8 items=0 ppid=1 pid=18588 auid=4294967295 uid=0 gid=0 euid=0 suid=0 fsuid=0 egid=0 sgid=0 fsgid=0 tty=(none) ses=4294967295 comm=colord exe=/usr/libexec/colord subj=system_u:system_r:colord_t:s0-s0:c0.c1023 key=(null)

Hash: colord,colord_t,fusefs_t,dir,read

audit2allow

#============= colord_t ==============
allow colord_t fusefs_t:dir read;

audit2allow -R

#============= colord_t ==============
allow colord_t fusefs_t:dir read;