How to choose a 15-bay NAS in 2026
3 NAS models across 1 vendors ship with 15 drive bays. The table below lists every one of them with its official drive-list depth — read each model page for the vendor's own tested drives.
All 15-bay models, ranked by official drive-list depth
CPU/RAM shown where the vendor publishes them (Synology/QNAP specs); "drives listed" = rows on the vendor's own compatibility tool.
| Model | Vendor | CPU | RAM | Drives listed |
|---|---|---|---|---|
| QNAP TVS-EC1580MU-SAS-RP R2 | QNAP | — | — | 337 |
| QNAP TVS-1582TU | QNAP | Intel Core i5-7500 4-core 3.4 GHz processor, Max turbo to 3.8 GHz | 16GB UDIMM DDR4 | 322 |
| QNAP TVS-EC1580MU-SAS-RP | QNAP | — | — | 310 |
Drives the most 15-bay machines share
Cross-checked against every 15-bay model's official list on this site — the safest part numbers when you're not sure which box you'll end up with:
| Drive | Brand | Series | Listed on | |
|---|---|---|---|---|
| MG04ACA400E | Toshiba | MG04ACA**** | 3 of 3 models | price |
| WD1005VBYZ | Western Digital | Gold | 3 of 3 models | price |
| WD2005VBYZ | Western Digital | Gold | 3 of 3 models | price |
| MG04ACA300E | Toshiba | MG04ACA**** | 3 of 3 models | price |
| MG04ACA200E | Toshiba | MG04ACA**** | 3 of 3 models | price |
| MG05ACA800E | Toshiba | MG05ACA**** | 3 of 3 models | price |
| WD4003FFBX | Western Digital | Red Pro | 3 of 3 models | price |
| MG04ACA600E | Toshiba | MG04ACA**** | 3 of 3 models | price |
| ST1000NM0008 | Seagate | Exos 7E2 | 3 of 3 models | price |
| WD121KRYZ | Western Digital | Gold | 3 of 3 models | price |
| ST4000NE0015 | Seagate | Enterprise NAS HDD | 3 of 3 models | price |
| ST2000NE0015 | Seagate | Enterprise NAS HDD | 3 of 3 models | price |