The symlinks are actually created in the -bedp step, not the -prep step. 
If you're running bedpostx outside of trac-all, you need to create them 
yourself.

On Thu, 16 Aug 2012, Watson, Christopher wrote:

> I've just taken to making the sym links myself after running trac-prep and 
> before running bedpostx. Then everything should run normally.
> ________________________________________
> From: freesurfer-boun...@nmr.mgh.harvard.edu 
> [freesurfer-boun...@nmr.mgh.harvard.edu] on behalf of Anastasia Yendiki 
> [ayend...@nmr.mgh.harvard.edu]
> Sent: Thursday, August 16, 2012 4:24 PM
> To: Richard Binney
> Cc: freesurfer@nmr.mgh.harvard.edu
> Subject: Re: [Freesurfer] TRACULA -prep error
>
> Hi Richard - In the listing you sent below I do see the a
> nodif_brain_mask.nii.gz and a control.dat, although I have no idea what
> control.dat is. As for data.nii.gz, it should be created as a symbolic
> link to dwi.nii.gz, since bedpostx indeed expects it to be called "data".
> I have not seen this problem before, but does it occur only when you rerun
> and overwrite things in the same directory, or also when you start a fresh
> run on a previously non-existent directory?
>
> a.y
>
> On Thu, 16 Aug 2012, Richard Binney wrote:
>
>> Hi Anastasia et al.,
>>
>> I previously had TRACULA running wonderfully on a test dataset. I was tasked
>> with writing an in-house step-by-step manual for dummies. Since then, a
>> colleague has followed my manual with a new dataset and had problems. After
>> trying to determine whether it was her install or something about her data
>> and failing to find anything, I returned to re-run the subject I had already
>> successfully processed. Nothing has changed in my install (TRAC-all version
>> etc) ODDLY, this re-run is suffering from the same problem as my colleague.
>>
>> We ran trac-all -prep -dmrirc and it exited without any errors. However,
>> there seem to be some files missing from the output:
>>
>> control.dat
>>
>> data.nii.gz
>>
>> nodif_brain_mask.nii.gz
>>
>>
>>
>> Bedpostx will not run due to the data file being missing and I'm sure the
>> other missing files will cause problems.
>>
>> What is going on?
>>
>> I knew to look for these files as at some point I found the following list
>> for the \dmri\. I can not re-find a post with this list so I'm sorry if it
>> related to a solution to our current problem.
>>
>> Please help
>>
>> Richard
>>
>> brain_anat_mni.nii.gz
>>
>> dtifit_L2.nii.gz  dwi_orig_flip.nii.gz
>>
>> brain_anat.nii.gz
>>
>> dtifit_L3.nii.gz
>>
>> dwi_orig.mghdti.bvals
>>
>> brain_anat_orig.nii.gz  dtifit_MD.nii.gz
>>
>> dwi_orig.mghdti.bvecs
>>
>> bvals
>>
>> dtifit_MO.nii.gz  dwi_orig.nii.gz
>>
>> bvecs
>>
>> dtifit_S0.nii.gz  dwi_snr.txt
>>
>> bvecs.norot
>>
>> dtifit_V1.nii.gz  lowb_brain.nii.gz
>>
>> control.dat
>>
>> dtifit_V2.nii.gz
>>
>> lowb.nii.gz
>>
>> data.nii.gz
>>
>> dtifit_V3.nii.gz
>>
>> mni
>>
>> dtifit_FA.nii.gz
>>
>> dwi.ecclog
>>
>> nodif_brain_mask.nii.gz
>>
>> dtifit_L1.nii.gz
>>
>> dwi.nii.gz
>>
>>  xfms
>>
>>
>>
>>
>
>
>
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