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Black rectangular desktop drive enclosure with front card slots and ports

LaCie

LaCie 2big Dock STLG40000400 40TB external hard drive

SKU CH-M96K-PW87F MPN STLG40000400

40 TB desktop RAID drive with dual Thunderbolt 3 ports, CFexpress B, CFast 2.0 and SD card slots plus a DisplayPort 1.4 output

  • Total capacity40 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
  • 40 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 5 devices
  • CFexpress B, CFast 2.0 and SD card slots ingest footage directly
  • DisplayPort 1.4 drives two 4 K monitors or one 8 K display

LaCie 2big Dock 40TB

The LaCie 2big Dock STLG40000400 is a desktop external hard drive with 40TB of total capacity and RAID 0/1 support. It reaches speeds up to 550MB/s and includes CFexpress B, CFast 2.0 and SD card slots plus a USB 3.2 Type A hub port and DisplayPort 1.4. Dual Thunderbolt 3 ports allow daisy chaining up to five devices. It suits creative professionals who need high-capacity storage and multi-device connectivity in one unit.

Upgrade from single-drive storage

This dock replaces standalone drives or smaller RAID enclosures that lack integrated card readers and video outputs. The jump is worth it when you need simultaneous ingest from CFexpress B, CFast 2.0 or SD media while driving up to two 4K monitors or one 8K monitor over DisplayPort 1.4. It is not for users who only need basic file backup without media-card workflows or multi-display requirements.

Desktop setup with hot-swappable drives

The unit ships with a USB-C cable, external power supply and quick install guide. Hot-swappable IronWolf Pro enterprise-class drives let you replace a failed module without tools or downtime. RAID configuration is managed through the included software. Common issues include forgetting to initialise the array before first use and connecting the dock to a host port that does not supply enough power for all peripherals.

How it compares

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

Price $1,610.99
Pricier than about 91% of the 144 comparable items (median $379.99).
Total capacity 40 TB
Higher than about 94% of the 101 comparable items (median 12 TB).
Price per TB $40.27 per TB
Pricier than about 60% of the 101 comparable items (median $37.00 per TB).

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Specifications

Product
Brand nameLaCie
Product line2big Dock
Model nameSTLG40000400
Total capacity40 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 weight8.51 lb (3.86 kg)
Shipping weight4.08 kg
Package size279 × 229 × 178 mm

Questions about this item

How much desk space does the 3.67 by 4.65 by 8.54 inch enclosure need?

The unit measures 3.67 inches wide, 4.65 inches deep and 8.54 inches tall, so allow at least that footprint plus cable clearance behind it.

Which drive bays are hot-swappable and how do I change RAID mode without losing data?

Both IronWolf Pro bays are hot-swappable; use the rear switch or LaCie Toolkit to migrate between RAID 0 and RAID 1 while the dock stays powered.

When should the two IronWolf Pro drives be replaced under heavy workloads?

Enterprise-class IronWolf Pro drives are rated for high annual workloads; plan replacement after five years or when SMART alerts indicate wear.

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