TDMS File Size Doubled After Saving in DIAdem

Updated Dec 11, 2022

Reported In

Software

  • DIAdem

Issue Details

I have a TDMS file, which I want to analyze with NI DIAdem. After working on the file, and saving it again, I have observed, that the file size nearly doubled.

Solution

This happens due to the fact, that the TDMS format allows different representations for numeric data, which need different amount of space.

DIAdem works with the DBL representation, so entries in numeric channels need 64 bit of space.
If the original TDMS file contains data in other representations, like SGL (32 bit), DIAdem converts the data to DBL.

Saving the file will not convert the data back to the original numeric representation, but the data will stay in DBL format, and therefore the TDMS file size increases.

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