File size is limited by the restraints of the operating system and the available memory space on your hard drive or disk (depending to which you save the file). Software for Windows and MacOS may have different limitations due to system restrictions. Release HIstory details.
AcqKnowledge 64-bit and Biopac Student Lab 32-bit
There are multiple cases (configs) related to the issue of Memory/HardDrive/32bit-64bit limitations
All released versions have the same single limit applied to channel(s) length in SAMPLES. Channel length is limited by 2 Giga Samples = 2,147,483,648 samples
Any EDIT functions (copy/paste, resampling, merging, duplicate channel, remove waveform, cut selected data area) cannot jump over this 2 GigaSamples limit
AcqKnowledge 64-bit offers big improvements in terms of file size and memory limitation
AcqKnowledge 64-bit can read/save data files of virtually unlimited size in bytes.
The only limitation is free hard disk space.
AcqKnowledge 64-bit cannot avoid 2 GigaSamples limit per channel, but can handle 100+ calculation/transformation channels (8 bytes per sample).
Example: AcqKnowledge 64-bit was tested with data files of about 45 Gbytes – 4 analog channels + 4 calc channels, length is about 1.1 GigaSamples
AcqKnowledge 64-bit utilizes two features—64-bit addressing and Virtual memory supported by Windows—and allow to handle data file which size is limited by Physical RAM and Virtual Memory settings of Windows OS.
AcqKnowledge 64-bit can allocate ALL physical RAM of the computer to load data into the memory for transformations, and also can utilize virtual memory of the computer.
Using of virtual memory for transformations or “load all data into memory” is very helpful—it does not limit user to transform extremely long data channels with annoying prompt “Not enough memory to execute transformation.” However, user should expect delays with transformations because virtual memory means using hard drive as memory substitute.
Example: Computer has 16GB of RAM and virtual memory configuration for PAGE FILE is set to Initial size = 24GB and Max size = 48GB. Under this setting, AcqKnowledge can load into the memory data file of about 16G + 48GB = 64 GB (minus memory allocated by OS Windows and other processes)
BSL 4.1.2 or above
File and memory functions are unchanged at 2 GigaSamples of length and 4 GBytes of file size. BSL 4.1.2 or above can allocate max 2 GBytes of RAM for transformations.
This build is known to crash when handling very big files, especially if duplicating channels
AcqKnowledge 3.9.0 and above files (including merged files) are not limited
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