Deleting a group to a TDMS file increases the file size

Hi all

I was searching for information on how to delete a group in a TDMS file. Apparently this is not a simple task as I thought because firstly, it is necessary to convert the TDMS file in a TOC file, remove the group from the TOC file and finally convert the TDM in PDM file. There is a sample project really nice here (I have attached it in the post anyway!).

This project works very well. Indeed, I am able to remove the group from the PDM file. However, I realized that perform the deletion process increases the size of the file (about 4 times). If you are viewing the PDM with the PDM file - file Viewer.vi you realize that several strange properties have been added to each channel of all other groups. I assumed that this is partly the cause of the increase in size.

Anyone know why this is happening?

I'm using LabVIEW 2014 and I downloaded the project for 2014 LabVIEW.

Any help is appreciated to higlhy.

Best regards

Diego Ballen

The old way was to read each group that you want to save and write to a new file. The fundamental problem is that TDMS format has been optimized for speed and no memory efficiency, which can cause a lot of complications when you seemingly simple things - like the deletion of data, or reading the data of the file.

That is why NEITHER came up with these new features. If you're stuck with an earlier version, you can always write your own function to do the same.

Mike...

Tags: NI Software

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