There was never an official 120 GB PlayStation 3 model. You are likely confusing it with another console or capacity.
| Model | Launch Date | Storage | Notes |
|---|---|---|---|
| CECHA/B (Fat, 60/20 GB) | Nov 2006 (JP/NA) / Mar 2007 (EU) | 60 GB / 20 GB | PS2 BC (HW), 4 USB, Card Readers |
| CECHC/E (Fat, 80/60 GB) | Aug 2007 (NA) / Oct 2007 (EU) | 80 GB / 60 GB | PS2 BC (SW - partial), 2 USB |
| CECHG/H (Fat, 40/160 GB) | Oct 2007 (NA) / Nov 2007 (EU/JP) | 40 GB / 160 GB | No PS2 BC. DualShock 3 bundle. |
| CECHK/L (Fat, 80/160 GB) | 2008 | 80 GB / 160 GB | Updated GPU (65nm RSX) |
| CECH-20xx (Slim) | Sep 2009 | 120 GB / 250 GB | First 120 GB model. 33% smaller, lower power. |
| CECH-30xx (Slim) | 2010 | 160 GB / 320 GB | 320 GB Japan-only initially. |
| CECH-40xx (Super Slim) | Sep 2012 | 250 GB / 500 GB | Sliding disc cover. Final revision. |
If you have a "120 GB Fat PS3," it's a user-upgraded unit, not a factory model.