The micro instance won't work. You'll need at least one m1.medium instance.
I don't want to advertise it again but have you considered using
http://cerebralvol.com that runs EC2 instances
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Pedro Paulo de Magalhães Oliveira Jun
Dear Freesurfers,
I tried to install freesurfer on amazon EC2 as instructed on the wiki page.
Everything went well except that mri_* tools like mri_convert doesn't work.
When calling it, it returns nothing.\
I also tried to make another Centos instance and install freesurfer manuall,
but the same