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Write Waveform to File VI Limits File Size to 2GB

Primary Software: LabVIEW Development Systems>>LabVIEW Full Development System
Primary Software Version: 8.0
Primary Software Fixed Version: N/A
Secondary Software: N/A

Problem:
When writing a large set of waveform data to a file using the Write Waveform To File VI, the file size is limited to 2GB.

I am running Windows XP using NTFS disk formatting and LabVIEW 8.0, so I should be able to theoretically write 16 EB of data.  Why can I only write 2GB?

Solution:
The Write Waveform To File VI uses the Write Datalog VI to save the data to disk.  Because of the index block architecture of datalog files, they are limited to 2GB, and thus, the waveform file that is to be written is limited to 2GB.

To avoid this limitation, use the Write To Measurement File Express VI using TDM or TDMS format or one of the other File I/O VIs.  This will allow you to create a binary file that will store as much data as your file system can address.

Related Links:
Managing Large Data Sets in LabVIEW

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Report Date: 05/23/2007
Last Updated: 07/19/2007
Document ID: 49MADLKO

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