It stands to reason. The low LBAs get filled first and used most. The outside of the disk is where the linear speed is fastest, and it's closest to where the heads park.
Yeah I understood that immediately after I read it, but it's not how typical optical discs work, and I'd just assumed they work the same way until now. Hadn't really thought about it before.
What I find a bit bizarre though that some defragmenters have an option to move files to the end of the drive. Wouldn't you want to move files to the beginning in that case?
Maybe if you're optimizing for write performance of new files (e.g. back in the day when sequential disk performance was more of a bottleneck, you'd want lots of contiguous free fast disk space for something like digitizing video)
