Zenbook S 14 (UX5406) SSD Upgrade

Yes — the Zenbook S 14 (UX5406) has 1 M.2 2280 slot.

Specifications

Storage slots: 1
Form factors: M.2 2280
Interfaces: PCIe
PCIe generation: Gen 4

Conditions

Replacement drives must match this laptop's supported form factor (M.2 2280) and interface (PCIe).

Worth knowing before you buy

A PCIe drive rated faster than Gen 4 will still work in this slot, but will run at the slot's Gen 4 speed rather than its rated maximum.

Sources

ASUS — ASUS Zenbook S 14 (UX5406) Tech Specs — verified 8/19/2026

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