it creates a file with a size that'll keep growing until you stop it, filled with garbage data. it makes it extremely easy to create a file of 50 gigabytes or so. it does it over the course of about 8 minutes or so, so it's not like it's filling your hard drive to the brim immediately.
how does that work with the allocation of individual file sizes? Like what happens if you overflow your buffer before the system checks on it again to resize? or is that not possible/not a realistic risk factor?