The LaCie 2big Dock – 40TB (STLG40000400) is a professional two-bay desktop hardware RAID and docking system for high-resolution photo, video and creative workflows.
It combines 40TB of raw storage from 2 × 20TB hot-swappable Seagate IronWolf Pro 7,200 RPM hard drives with dual Thunderbolt 3, DisplayPort 1.4, a front USB 3.2 Gen 2 Type-A hub and dedicated CFexpress Type B, CFast 2.0 and SD UHS-II card readers. LaCie specifies 2big Dock family transfer speeds up to 550 MB/s, with actual performance dependent on RAID mode, drive capacity, interface and operating environment.
Original price was: £ 1,734.99.£ 1,639.95Current price is: £ 1,639.95. | £ 1,967.94 inc VAT
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The LaCie 2big Dock - 40TB (STLG40000400) combines high-capacity professional storage, hardware RAID and desktop docking in one two-bay enclosure. This 40TB configuration is fitted with two 20TB Seagate IronWolf Pro enterprise-class hard drives operating at 7,200 RPM.
Designed for demanding creative workflows, the 2big Dock brings storage, RAID management, memory-card ingestion, display output, peripheral connectivity and laptop power delivery together through a Thunderbolt-based desktop workflow.
LaCie specifies 2big Dock family transfer speeds up to 550 MB/s. Actual performance varies with RAID mode, installed drive capacity, host interface and operating environment. The enclosure supports RAID 0, RAID 1 and JBOD, with RAID 0 as the factory-default mode. RAID 0 prioritises performance and full raw capacity, RAID 1 mirrors data between the two drives for redundancy, and JBOD presents the installed drives independently.
Two 20TB Seagate IronWolf Pro enterprise-class hard drives provide 40TB of raw capacity. The 3.5-inch 7,200 RPM drives are mounted in hot-swappable trays, allowing a failed drive to be replaced without shutting down the enclosure when the active RAID configuration and workflow permit.
Dedicated front-panel slots support CFexpress Type B, CFast 2.0 and SD UHS-II media, allowing photographers and video teams to ingest common professional camera media without separate desktop card readers.
Two Thunderbolt 3 ports provide up to 40 Gb/s interface bandwidth for host connection and downstream expansion. LaCie supports daisy chaining of up to five Thunderbolt devices, helping consolidate storage and peripherals around a single host connection.
DisplayPort 1.4 provides dedicated monitor connectivity, while the front USB 3.2 Gen 2 Type-A hub port supports peripherals at up to 10 Gb/s and can provide up to 7.5W to a connected device.
When the peripheral Thunderbolt port is unused, the host Thunderbolt connection can receive up to 45W. When a Thunderbolt peripheral is connected, the power budget is shared as up to 30W for the host and up to 15W for the downstream device.
LaCie Toolkit supports setup and backup workflows, while LaCie RAID Manager provides RAID configuration and system-health monitoring. The current specification supports compatible USB-C hosts across USB 40 Gb/s, USB 20 Gb/s, USB 10 Gb/s and USB 5 Gb/s connections as well as Thunderbolt 5, Thunderbolt 4 and Thunderbolt 3 hosts, subject to host capabilities.
The 2big Dock is backed by a five-year limited warranty and Rescue Data Recovery Services, subject to Seagate terms and regional availability. The enclosure carries LaCie's Neil Poulton industrial design.
| Manufacturer | LaCie / Seagate |
| Product | LaCie 2big Dock - 40TB |
| Ordering Model Number | STLG40000400 |
| Total Raw Capacity | 40TB |
| Drive Configuration | 2 × 20TB Seagate IronWolf Pro enterprise-class HDDs |
| Drive Speed | 7,200 RPM |
| Drive Bays | 2, hot-swappable |
| RAID Modes | RAID 0, RAID 1, JBOD |
| Factory Default RAID | RAID 0 |
| Maximum Transfer Speed | Up to 550 MB/s family specification; actual rates vary by RAID mode, drive capacity, interface and operating environment |
| Thunderbolt | 2 × Thunderbolt 3, up to 40 Gb/s |
| Thunderbolt Daisy Chain | Up to 5 Thunderbolt devices |
| Display Output | DisplayPort 1.4 |
| USB Hub | 1 × USB 3.2 Gen 2 Type-A, up to 10 Gb/s and 7.5W |
| Card Readers | CFexpress Type B; CFast 2.0; SD UHS-II |
| Host Power Delivery | Up to 45W with peripheral Thunderbolt port unused; up to 30W host plus 15W downstream when occupied |
| Compatible Host Interfaces | USB 40 Gb/s, USB 20 Gb/s, USB 10 Gb/s, USB 5 Gb/s; Thunderbolt 5, Thunderbolt 4 and Thunderbolt 3, subject to host capabilities |
| Factory File System | exFAT |
| Management Software | LaCie Toolkit; LaCie RAID Manager |
| Dimensions | 217 × 118 × 93.3mm |
| Weight | 3.86kg |
| Power | External power supply |
| Included Data Cable | Thunderbolt 3 (40 Gb/s) cable |
| Recommended Free Disk Space | 600MB |
| Limited Warranty | 5 years |
| Rescue Data Recovery Services | Included, subject to manufacturer terms and regional availability |
| Design | Neil Poulton |
Generally, next working day delivery services (UK Mainland) are available on standard LaCie Delivery orders placed before 2 pm (subject to stock availability).
Non-timed deliveries should be delivered between 9 am and 6 pm.
Orders placed after 2 pm on Fridays and weekends will be processed as normal the following Monday.
Orders placed on Bank Holidays will be processed the next working day.
If urgent, please call one of our helpful account managers so they may double check everything for you, enabling you to place your order with confidence.
Please note: these product details are for guide purposes only, and may contain errors.
We always recommend double-checking the product specs and features on the manufacturer website, or contact us if unsure before ordering.
