Ha, pretty much.
Yeah, the file sizes are huge.
1 minute 4K - 5GB / 1 hour - 300GB
1 minute 1080p - 1.5GB / 1 hour - 90GB
Since I use this for work, most of my clients will purchase hard drives for the work. If they want to "upgrade" to 4K then they spend more for hard drives and pay me for labor.