The difference isn't how much distress a child shows — it's whether they have a strategy. Secure infants have one coherent way to seek comfort. Disorganized infants have no workable strategy at all, because the two obvious ones point at the same person.
Side by side
Aspect
Disorganized
Secure
Strategy
None coherent
One that works
On reunion
Approach and freeze
Approach and settle
Caregiver is
Fear and remedy
Remedy
Status
A classification
A classification
What each one means
Disorganized Attachment
Disorganized attachment is a Strange Situation classification for a child whose behaviour has no workable strategy in it — approaching and avoiding at once, freezing mid-movement, or plain disorientation. The leading account is that the person they would go to for comfort is also a source of their alarm.