How to upgrade disks in NTE?

This disk-upgrade page is more useful when it explains **which disks deserve early investment and when upgrading should pause for reevaluation** instead of preserving rules like 'only enhance A/S rank' and one fixed substat list as permanent doctrine. For current players, the practical questions are whether a disk is likely to stay on an active character, whether it fills a meaningful stat gap right now, and whether further resources are chasing only marginal gains.

A safer way to judge disk upgrades is:

1. Give enhancement resources first to **disks that are both actively equipped and still have real growth value** instead of maxing anything rare on sight

2. Damage, support, and sustain roles care about different stat patterns, so matching the role matters more than repeating one generic priority line

3. If a disk is only transitional gear, upgrading it to the 'usable now' stage is often enough before heavier investment

So this page now focuses on investment order and stop-point judgment for disk upgrades instead of preserving one fixed enhancement slogan as the only answer.