While this is certainly not a new issue with IronKey, historically it has had a few difficulties with mounting and permissions within non-windows environments, I thought it might be beneficial to throw an article out there with some updated syntax for OSX. If you recently got your hands on one of the newer Iron Keys, you may have had some issues mounting your encrypted volumes within OSX 10.7 & 10.8, however do not fear, the command line hero is here!
I've simplified the entire process down to a single command.
echo -e “sudo chmod 644 /dev/rdisk2* \n/Volumes/IronKey/IronKey.app/Contents/MacOS/IronKey” > iron.sh && chmod 755 iron.sh
This command will create a bash script called iron.sh, change the permissions of the script so that it can execute, which then can be run to change the permissions on the partitions within the IronKey itself so that OSX can appropriately read the partitions to mount the device!