Thin 15 B12UCX SSD Upgrade
Yes — the Thin 15 B12UCX has 2 M.2/2.5-inch slots.
Specifications
- Storage slots
- 2
- Form factors
- M.2, 2.5-inch
- Interfaces
- PCIe, SATA
- PCIe generation
- Gen 4
Conditions
- Replacement drives must match this laptop's supported form factor (M.2, 2.5-inch) and interface (PCIe, SATA).
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
- MSI — Thin 15 B12UCX-1428TH Specification Sheet — verified 8/20/2026
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