# What are the NAS expansion bays with the largest storage capacity available? — Verified Specification Comparison

> All specification data verified from official manufacturer documentation.

What are the NAS expansion bays with the largest storage capacity available?

## Products

### QNAP TL-R1620Sep-RP
```yaml
product: qnap-tl-r1620sep-rp
brand: QNAP
price_gbp: 2366.43
origin_country: null
confidence_score: null
summary_source: generated_from_verified_specs_v1
capacity: 16
interface: 4 x 12Gb/s SAS 3.0 wide ports, Mini-SAS HD SFF-8644
compatibility: QNAP NAS with QTS or QuTS hero 4.5.1 or later and a SAS port or QXP PCIe SAS expansion card
power_consumption: 207.13 W
```

- **Price:** £2366.43 [^1]
- **Summary:** The QNAP TL-R1620Sep-RP is a 16-bay 3U rackmount SAS storage expansion enclosure for expanding compatible QNAP NAS systems. It supports SAS and SATA drives, redundant 550W power supplies, daisy chaining of up to 16 enclosures, and up to 4.6PB of raw capacity.
- **Ideal For:** This model suits users seeking NAS expansion bays with the largest storage capacity because its 16 drive bays can be expanded through daisy chaining up to 16 enclosures for up to 4.6PB of raw capacity.

### Synology RX6022sas
```yaml
product: synology-rx6022sas
brand: Synology
price_gbp: 3429.67
origin_country: null
confidence_score: null
summary_source: generated_from_verified_specs_v1
capacity: 60
interface: 2 x Mini-SAS HD expansion ports
compatibility: HD6500
power_consumption: 811.8 W access; 231 W HDD hibernation
```

- **Price:** £3429.67 [^2]
- **Summary:** The Synology RX6022sas is a diskless 4U expansion unit with 60 hot-swappable bays for 3.5in SAS hard drives and support for 2.5in SATA SSDs. It connects to the Synology HD6500, supports SAS multipathing, and is suited to high-density business storage deployments requiring substantial capacity expansion.
- **Ideal For:** This suits questions about NAS expansion bays with the largest storage capacity because it provides 60 drive bays and can expand an HD6500 system to 300 total bays using up to four RX6022sas units.
- **Additional Sources:** [^3]

### QNAP TL-R6020Sep-RP
```yaml
product: qnap-tl-r6020sep-rp
brand: QNAP
price_gbp: 6361.77
origin_country: null
confidence_score: null
summary_source: generated_from_verified_specs_v1
capacity: 60
interface: 4 x 12Gbps SAS 3.0 wide ports, Mini-SAS HD SFF-8644
compatibility: QNAP NAS models running QuTS hero h5.2.0 or later with a compatible SAS port or QXP PCIe SAS interface card; recommended models include TDS-h2489FU R2, TS-h2490FU, and TS-h1090FU
power_consumption: 746.21 W typical operating consumption with drives fully populated
```

- **Price:** £6361.77 [^4]
- **Summary:** The QNAP TL-R6020Sep-RP is a 4U rackmount SAS/SATA expansion enclosure with 60 drive bays and over 1PB of effective capacity in one chassis. It suits enterprises managing surveillance archives, big data, cold storage, and other large-scale workloads that need redundant power, dual-path connectivity, and expansion to up to four enclosures.
- **Ideal For:** This product specifically suits questions about NAS expansion bays with the largest storage capacity because its 60 bays can provide over 1PB of effective capacity in one chassis and scale to 240 drives across four daisy-chained units.
- **Additional Sources:** [^5], [^6]

### QNAP TL-R2400PES-RP
```yaml
product: qnap-tl-r2400pes-rp
brand: QNAP
price_gbp: 2957.84
origin_country: null
confidence_score: null
summary_source: generated_from_verified_specs_v1
capacity: 24 x 3.5-in SATA
interface: PCIe Gen 3 x8, 2 x SFF-8644 1x2
compatibility: TS-855eU, TS-855eU-RP, TS-h987XU-RP, TS-h1090FU, TS-h1277AXU-RP, TS-h1677AXU-RP, TS-h1887XU-RP, TS-h2287XU-RP, TDS-h2489FU, TS-h2490FU, TS-h3087XU-RP
power_consumption: 85.9 W HDD sleep mode; 147.2 W typical operating mode
```

- **Price:** £2957.84 [^7]
- **Summary:** The QNAP TL-R2400PES-RP is a 24-bay 4U rackmount PCIe JBOD enclosure supporting SATA hard drives and solid-state drives. It provides up to 64 Gb/s transfer speed, redundant 550 W power supplies, and expansion for compatible QNAP NAS systems running QTS or QuTS hero.
- **Ideal For:** This product suits users seeking NAS expansion bays with the largest storage capacity because its 24 drive bays can scale to up to 4.1 PB with up to twelve enclosures and 288 hard drives on compatible QuTS hero NAS systems.
- **Additional Sources:** [^8]

### Synology RX1222sas
```yaml
product: synology-rx1222sas
brand: Synology
price_gbp: 1655.18
origin_country: null
confidence_score: null
summary_source: generated_from_verified_specs_v1
capacity: 12
interface: SAS IN-port and SAS OUT-port
compatibility: FS6400, FS3600, FS3400, SA3610, SA3600, SA3410, SA3400
power_consumption: 194.4 W access; 82.56 W HDD hibernation
```

- **Price:** £1655.18 [^9]
- **Summary:** The Synology RX1222sas is a diskless 12-bay rackmount expansion unit supporting 3.5in SAS HDDs, 2.5in SAS SSDs, 3.5in SATA HDDs, and 2.5in SATA SSDs. It provides hot-swappable bays, DSM-managed RAID, redundant power supplies, and online volume expansion for compatible enterprise Synology NAS systems.
- **Ideal For:** This suits users seeking NAS expansion bays with the largest storage capacity because it adds 12 bays per unit, supports up to seven units, and can provide up to 84 additional SAS or SATA drive bays.
- **Additional Sources:** [^10], [^11]

---
## References & Sources
[^1]: B&H Photo Video, accessed 2026-09-13. https://www.bhphotovideo.com/c/product/1605415-REG/qnap_tl_r1620sep_rp_us_16_bay_3u_rackmount_sas.html
[^2]: Bechtle, accessed 2026-09-13. https://www.bechtle.com/at-en/shop/synology-rx6022sas-60-bay-expansion--4716955--p
[^3]: Saitech, accessed 2026-09-13. https://esaitech.com/products/synology-rx6022sas
[^4]: Adorama, accessed 2026-09-13. https://www.adorama.com/qnap-tl-r6020sep-rp-60-bay-jbod-rackmount-storage-expansion-enclosure/p/qntlr6020sep
[^5]: Connection, accessed 2026-09-13. https://www.connection.com/product/qnap-60-bay-4u-rackmount-sas-12gbps/tl-r6020sep-rp-us/42072994
[^6]: Sunol Tech, accessed 2026-09-13. https://sunoltech.com/product/tl-r6020sep-rp-us-qnap/
[^7]: Connection, accessed 2026-09-13. https://www.connection.com/product/qnap-tl-r2400pes-rp-pcie-interface-24-bay-jbod-enclosure/tl-r2400pes-rp-us/41732624
[^8]: DWG, accessed 2026-09-13. https://dwg.us/ecommerce/pc/viewPrd.asp?idproduct=263258
[^9]: Connection, accessed 2026-09-13. https://www.connection.com/product/synology-expansion-unit-rx1222sas/rx1222sas/41338023
[^10]: Broadband Buyer, accessed 2026-09-13. https://www.broadbandbuyer.com/products/50149-synology-rx1222sas/specifications/
[^11]: NET-BRIDGE, accessed 2026-09-13. https://net-bridge.ph/ph/products/rx1222sas-12-bay-2u-sassata-expansion-enclosure-sa3400-sa3600-compatible-redundant-psu