calculate tdms file size

[ASTDan]

How do I calculate .tdms file size on disk?

I know how many properties and channels and the number of data points/channel.  I need a way to approximate the file size on disk.  I am hoping there is some formula out there I can use.

Thanks

Dan

[Hillman]

Hi Dan,

I am not aware of a simple formula to work this out because its not a normal binary file. The TDMS format consists of two separate files, a binary file and a binary index file. This combination makes any calculations difficult. So I think the solution would be complex.

Can I ask why you'd need this? 

Regards, 

[ASTDan]

I am designgin a file format I and I need to figure out how much the file will take up on disk.

If I have X channels of Y length approximatly how much disk space will this take up?

Dan

[Hillman]

Hi Dan,

It depends how your writing to the tdms file, because if your writing to it in chunks - the software creates a new header each time.

I found this forum on the subject- was useful, which also contained this link on tdms.

I can only suggest that you write some test code to see if there is a linear relationship.. but I feel there are too many variables to take into account.

Please let me know how you get on.

Regards,