Photron Fastcam SA6 User Manual page 139

The memory is divided into the number of partitions entered in "Number".
2.
When a total of 3200 frames of memory is divided into 2 partitions, the memory is divided into
2 partitions of 1600 frames.
Enter the desired number of blocks in "Block".
3.
The size of the partition is changed to the size "total size ⁄ number of blocks × entered value".
Divide a total of 3200 frames of memory into 2 partitions, and when dividing the partitions into
800 frames and 2400 frames, first change (decrease) one partition's size to 800 frames, then
change (increase) the other partition's size to 2400 frames.
129 Photron FASTCAM Viewer