Fdd 2059 Extra Quality ((install)) Review

When a component is labeled as "Extra Quality" (EQ), it has undergone more rigorous testing than standard consumer or industrial-grade counterparts. For a part like the FDD 2059, this usually implies:

Minimal variance in electrical output or mechanical dimensions. fdd 2059 extra quality

Is this for a (like a floppy disk drive or a transistor)? Is this for a drivers/software context or a physical part ? When a component is labeled as "Extra Quality"