maximum values in TDMS channel

[clu03]

Hello,

I have been experimenting with writing very large TDMS files using the TDM C DLL. I've been running into this error when trying to append values into a channel: "Error: The request would exceed the maximum number of data values for a channel." I was wondering if this maximum number in one channel is explicitly written anywhere, as I've only been able to find that a file can have infinite groups and a group can have infinite channels. If not, how could I tell that I'm about to exceed the maximum number and make a new channel / group to store my values? 

Thanks!

[santo_13]

I guess the limit is in the index data types used by the file format i.e., U32.

https://www.ni.com/en/support/documentation/supplemental/06/the-ni-tdms-file-format.html

https://www.ni.com/en/support/documentation/supplemental/07/tdms-file-format-internal-structure.html

[clu03]

Could you elaborate more on what you mean by index data types? I'm not super familiar with how data types would affect the file. Thank you!

[Hooovahh]

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@santo_13 wrote:

I guess the limit is in the index data types used by the file format i.e., U32.

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Are you sure this is a U32?  When I drop down a TDMS Read the Index data type is an I64.  I assumed this meant it could address very large amounts of data per channel.  Admittedly I'm not sure I've ever logged over 4 billion values of anything to a TDMS file before.