<p dir="ltr">Hi Ralf,</p>
<p dir="ltr">Difficult to know what's going on without a bit more information, but my guess is things start going wrong when you hit the 32-bit threshold. I'm not sure why it wouldn't at least stop tracking if that were the case though, I thought I'd put in some checks in case this type of problem occurred... In any event, the fact that you can generate a decent number of tracks successfully strongly suggests that the problem is related to file size in some way, and a quick calculation suggests that 500,000 tracks would probably take up of the order of 2-4Gb. You can probably check whether your file grows as expected beyond 2 or 4Gb: if it stops at that point, that would be the problem...</p>
<p dir="ltr">Assuming that's the case, the problem would be either that you're running a 32 version of MRtrix, that your virtual machine is itself 32 bit, or that the filesystem you're writing to doesn't support large file sizes (e.g. the FAT filesystem as used in DOS-formatted hard drives). Since it does look like you're writing to an external hard drive, I would have a good look at how it's formatted... If it's a FAT partition, you might want to consider reformatting as a NTFS partition.</p>
<p dir="ltr">Hope this helps,<br>
Donald.</p>
<p dir="ltr"> <br>
--<br>
Dr J-Donald Tournier (PhD)</p>
<p dir="ltr">Senior Lecturer, Biomedical Engineering<br>
Division of Imaging Sciences & Biomedical Engineering<br>
King's College London</p>
<p dir="ltr">A: Department of Perinatal Imaging & Health, 1st Floor South Wing, St Thomas' Hospital, London. SE1 7EH<br>
T: +44 (0)20 7188 7118 ext 53613<br>
W: <a href="http://www.kcl.ac.uk/medicine/research/divisions/imaging/departments/biomedengineering">http://www.kcl.ac.uk/medicine/research/divisions/imaging/departments/biomedengineering</a><br>
</p>
<div class="gmail_quote">On 13 Jan 2014 13:53, "Ralf" <<a href="mailto:luetzken@med.ovgu.de">luetzken@med.ovgu.de</a>> wrote:<br type="attribution"><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div dir="ltr"><div>Hello,</div><div><br></div><div>did somebody encounter the error?</div><div><br></div><div>I can load whole brain tracks with 500,000 but 1,000,000 and above doesnt work. Im not sure where the threshold is.</div>
<div><br></div><div>Terminal:</div><div><br></div><div>generated the track:</div><div><br></div><div>30111 405207 generated, </div><div>30111 2019750 generated,</div><div>1500000 selected [100%]</div><div>[1]+ Done </div>
<div><br></div><div>real<span style="white-space:pre-wrap"> </span>68m21.159s</div><div>user<span style="white-space:pre-wrap"> </span>61m49.668s</div><div>sys<span style="white-space:pre-wrap"> </span>7m42.241s</div>
<div><br></div><div>ubuntu@ubuntu-virtual-machine:/mnt/hgfs/HR_DWI/ho33_2404_1.4_B1500_ElectroVectorScheme/dicomdaten_nr3538$ mrview anat_ho33_2404.mif &[1] 4237<br></div><div><br></div><div>Then I try loading the Track with the GUI:</div>
<div><br></div><div>ubuntu@ubuntu-virtual-machine:/mnt/hgfs/HR_DWI/ho33_2404_1.4_B1500_ElectroVectorScheme/dicomdaten_nr3538$ mrview: file "/mnt/hgfs/HR_DWI/ho33_2404_1.4_B1500_ElectroVectorScheme/dicomdaten_nr3538/whole_brain_1500000t.tck"<b> is not in MDS format (unrecognised magic number)</b></div>
<div><b><br></b></div><div>No further details about the error are given.<br></div><div><br></div><div>Hope somebody can help,</div><div><br></div><div>Ralf Lützkendorf</div></div>
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