pcsnwltd loss is over 20%. This amount of lost space seems excessive even with the different math involved. What might be happening is a hidden volume might have been created that is consuming some of the 52 GB of space. Windows doesn’t shown the hidden volumes on my HP Laptop where the HP install created recovery volumes. However, easeUS partition manager and my Casper backup software will show the hidden space.
If there are no any hidden volumes are taking up the missing space I would be uncomfortable with that much lost space going missing at the start of use. During operation and as the SSD memory cells die, the SSD controller is programmed to remove the bad cells from use and this kind of lost space can appear over time, and I expect it happen.
I like this disk. I’ll upgrade it to a Sandisk twice its size once large SSD pricing falls to where this disk is priced. Until then I create a mirror copy of all my disk each week onto a other disks so as to survive a bad disk day.