Summary: Samsung includes the losses from the 1024<=>1000 conversion into the system size, making it appear much larger than it actually is. This also explains

Summary: Samsung includes the losses from the 1024<=>1000 conversion into the system size, making it appear much larger than it actually is. This also explains why OneUi occupies more space on phones with more storage: 69GB are lost on this conversion on 1TB models, whereas only 9GB are lost on the 128GB model.