Re: XPS 15 has only 461GB SSD instead of 512GB
Ok then...so as you said, according to the conversion 512GB decimal should be over 470GB binary, but the discrepancies between ~470 and 461GB are due to default system partitioning etc?
Correct. If you open something like Windows Disk Management, the bottom half of the main (center) display area will show your drive's partition map. I'm going to guess you'll have a Windows Recovery partition of around 500-750MB somewhere as well as a multi-GB Dell Recovery partition that would contain your factory restore image along with the utility to actually restore it.