Try doing it in matlab, so
a = MRIread('orig.mgz');
MRIwrite(a,'orig.mgz');

doug

Arno Klein wrote:

dear doug,

i am using FS v5.1 now but ran the 20 oasis subjects through FS v5.0.  i am only having this trouble for one of the subjects.

after the mri_convert workaround i am still getting the same memory allocation error.  
cheers,
@rno

On Fri, Jan 20, 2012 at 4:23 PM, Douglas N Greve <greve@nmr.mgh.harvard.edu <mailto:greve@nmr.mgh.harvard.edu>> wrote:

   This is a strange problem we've been having with some mgz files
   that were generated during a short period of time last summer when
   there was a bug in the mgz writing code. What version of FS are
   you using? In the current dev version, this should not be a
   problem. A work-around is to convert the orig.mgz to itself using
   mri_convert in the dev environment, ie,

   mri_convert orig.mgz orig.mgz

   doug

   Arno Klein wrote:


       i get the following memory allocation error for only one out
       of 20 oasis subjects that i processed with freesurfer 5.1 on
       an ubuntu 11.10 machine with 24gb memory:

       mris_register -curv subjects/OAS1_0061_MR1/surf/lh.sphere
       templates_freesurfer/lh.KKI_2.tif
       subjects/OAS1_0061_MR1/surf/lh.sphere_to_KKItemplate.reg
       using smoothwm curvature for final alignment
       $Id: mris_register.c,v 1.59 2011/03/02 00:04:33 nicks Exp $
        $Id: mrisurf.c,v 1.693.2.2 2011/04/27 19:21:05 nicks Exp $
       reading surface from subjects/OAS1_0061_MR1/surf/lh.sphere...
       TAGskip: tag=1717658469, failed to calloc 1868656640 bytes!
       Cannot allocate memory

       system information:

       FREESURFER_HOME: /usr/local/freesurfer
       Build stamp: freesurfer-Linux-centos4_x86_64-stable-pub-v5.1.0
       Debian version: wheezy/sid
       Kernel info: Linux 3.0.0-14-generic x86_64

       cheers,
       @rno

       ------------------------------------------------------------------------

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   --     Douglas N. Greve, Ph.D.
   MGH-NMR Center

   greve@nmr.mgh.harvard.edu <mailto:greve@nmr.mgh.harvard.edu>
   Phone Number: 617-724-2358 <tel:617-724-2358> Fax: 617-726-7422
   <tel:617-726-7422>

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   <http://www.nmr.mgh.harvard.edu/facility/filedrop/index.html>

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Douglas N. Greve, Ph.D.
MGH-NMR Center
greve@nmr.mgh.harvard.edu
Phone Number: 617-724-2358 Fax: 617-726-7422

Bugs: surfer.nmr.mgh.harvard.edu/fswiki/BugReporting
FileDrop: www.nmr.mgh.harvard.edu/facility/filedrop/index.html