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Black rectangular desktop drive enclosure with front card slots and ports

LaCie

LaCie 2big Dock STLG20000400 20TB external hard drive

SKU CH-0VVH-SM5M0 MPN STLG20000400

A 20 TB desktop RAID enclosure with dual Thunderbolt 3 ports, CFexpress B, CFast 2.0 and SD card slots, a USB 3.2 Type A hub and DisplayPort 1.4 for daisy-chaining up to five devices

  • Total capacity20 TB
  • Interface typeUSB 3.2 Gen 2
  • Supported RAID modes0/1
  • Setup requirementsInterface: Thunderbolt 3 + USB 3.1 (THUNDERBOLT 3 + USB 3.1)
  • Product colorBlack
  • Key featuresup to 40 TB of capacity and speeds of up to 550 MB/s Stay co
  • 20 TB capacity stores massive creative libraries
  • Up to 550 MB/s transfer speeds accelerate large-file workflows
  • Dual Thunderbolt 3 ports daisy-chain up to five devices
  • CFexpress B, CFast 2.0 and SD card slots ingest footage directly
  • RAID 0/1 lets you choose speed or data redundancy

Professional storage hub

The LaCie 2big Dock STLG20000400 provides 20TB of desktop storage in a RAID 0/1 enclosure with Thunderbolt 3 and USB 3.2 Gen 2 connectivity. It targets creative professionals who need high-capacity backup and fast access to large media libraries. Integrated CFexpress B, CFast 2.0 and SD card slots plus a DisplayPort 1.4 output reduce the need for extra adapters. The unit ships new with enterprise-class IronWolf Pro drives installed.

Sustained throughput

Dual Thunderbolt 3 ports support daisy-chaining up to 5 devices while maintaining up to 550MB/s transfer rates during long ingest or export sessions. RAID 0 stripes data across both drives for maximum bandwidth; RAID 1 mirrors for redundancy without halting workflow. The hardware RAID controller manages rebuilds in the background so performance stays consistent across extended renders or batch exports.

Setup and common issues

Connect the supplied USB-C cable and external power supply, then use the front USB 3.2 Type A hub port for peripherals or charging. Hot-swappable drive trays let you replace a failed IronWolf Pro module without tools or downtime. Compatibility covers most Windows, macOS and iPad USB-C hosts via Thunderbolt 3, Thunderbolt 4, USB4 or USB 3.0. Buyers who need a single-drive portable solution or lack a Thunderbolt 3 or USB-C host will find this enclosure unsuitable.

How it compares

Measured against everything we stock in High-Capacity External Drives, at today’s prices. Recalculated every night.

Price $728.99
Pricier than about 77% of the 144 comparable items (median $379.99).
Total capacity 20 TB
Higher than about 80% of the 101 comparable items (median 12 TB).
Price per TB $36.45 per TB
Cheaper than about 54% of the 101 comparable items (median $37.00 per TB).

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Specifications

Product
Brand nameLaCie
Product line2big Dock
Model nameSTLG20000400
Total capacity20 TB
Product colorBlack
Storage
Supported RAID modes0/1
Ports & slots
Interface typeUSB 3.2 Gen 2
Thunderbolt 3 supportYes
Size & build
Product dimensions3.67 in × 4.65 in × 8.54 in
Product weight8.34 lb (3.78 kg)
Shipping weight3.63 kg
Package size279 × 229 × 178 mm

Questions about this item

How loud does the 2big Dock run during continuous RAID 1 operation?

The drive uses hot-swappable IronWolf Pro enterprise-class drives; fan noise under sustained load is typical for a desktop RAID enclosure.

What host connection is required to reach the stated 550 MB/s transfer speed?

A Thunderbolt 3 or USB 3.2 Gen 2 USB-C port on the computer is needed to achieve the advertised throughput.

Can I daisy-chain an older Thunderbolt 2 display through the dual Thunderbolt 3 ports?

The dock provides dual Thunderbolt 3 ports for daisy-chaining up to five Thunderbolt 3 devices; Thunderbolt 2 gear requires an adapter not included.

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