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When saving an image, does it append or replace the data?

2 years ago, by thedexmonster in RAM Disk Forum

I'm trying to weigh the pros and cons of a less volatile setup. I need to know how much data will actually be written to the hard drive every (n) minutes if the image file is 1GB, but for instance: only held 2kb of data, or had 1 file of 2kb added to it since it was last saved? Appending would only copy the difference between the two states, making it perfectly reasonable to write a large imag