# HCP dwi data pre

**URL:** <https://community.mrtrix.org/t/hcp-dwi-data-pre/7837>\
**Category:** Uncategorized\
**Tags:** preprocessing\
**Created:** [July 28, 2024, 9:02am UTC](https://community.mrtrix.org/t/hcp-dwi-data-pre/7837 "2024-07-28T09:02:06Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![Owl](https://community.mrtrix.org/letter_avatar_proxy/v4/letter/o/dc4da7/32.png) [@Owl](https://community.mrtrix.org/u/Owl)\
**Post date:** [July 28, 2024, 9:02am UTC](https://community.mrtrix.org/t/hcp-dwi-data-pre/7837/1 "2024-07-28T09:02:07Z")

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Hi all,  
I’m working on HCP dwi data, according to [GitHub - civier/HCP-dMRI-connectome: MRtrix scripts to generate dense weighted structural connectomes from the Human Connectome Project "minimally pre-processed" diffusion MRI data](https://github.com/civier/HCP-dMRI-connectome/blob/master) tutorial.I would like to ask the difference between these two commands: “mrconvert data.nii DWI. mif-fslgrad bvecs bvals -datatype float32-stride 0,0,0,1” and"mrconvert data.nii DWI.mif -fslgrad bvecs bvals".  
Best wishes!  
Wang

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<div class="post-metadata">

**Author:** ![Owl](https://community.mrtrix.org/letter_avatar_proxy/v4/letter/o/dc4da7/32.png) [@Owl](https://community.mrtrix.org/u/Owl)\
**Post date:** [July 28, 2024, 9:06am UTC](https://community.mrtrix.org/t/hcp-dwi-data-pre/7837/2 "2024-07-28T09:06:12Z")

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mrinfo output:  
mrconvert data.nii DWI. mif-fslgrad bvecs bvals -datatype float32-stride 0,0,0,1

 ![image](https://community.mrtrix.org/uploads/default/original/2X/d/d35d7bf13536926359669acde82534b411bb70e9.png)  
mrconvert data.nii DWI.mif -fslgrad bvecs bvals  
 ![image](https://community.mrtrix.org/uploads/default/original/2X/8/851f411a628a6b9f769fc39c8c2bb3de9046f047.png)  
I notice that "data strides“ parts are different. Is that important?

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<div class="post-metadata">

**Author:** ![Owl](https://community.mrtrix.org/letter_avatar_proxy/v4/letter/o/dc4da7/32.png) [@Owl](https://community.mrtrix.org/u/Owl)\
**Post date:** [July 28, 2024, 10:36am UTC](https://community.mrtrix.org/t/hcp-dwi-data-pre/7837/3 "2024-07-28T10:36:45Z")

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By the way, I’m doing this with minimal pre-processed data.