LeKuo AA24S81:USB4 40Gbps to 8-Port SATA Expansion Card

Many laptops and mini PCs equipped with USB4 or Thunderbolt ports come with limited internal drive bays. When users want to build multi‑drive storage arrays or media cache pools, traditional single‑drive enclosures fall short in capacity, stacking multiple enclosures creates cable clutter, and desktop PCIe expansion cards cannot fit into slot‑less portable devices. The Loku AA24S81 USB4 to 8‑Port SATA Expansion Device, powered by the ASM2464PDX and 88SE9215 chips, uses a single USB4 interface to expand into two independent PCIe ×2 channels. With the included cables, it supports up to eight SATA drives, offers hot‑swap capability, and adapts to a variety of professional storage scenarios.

Core Architecture Analysis: ASM2464PDX + 88SE9215 Enables Dual‑Path SATA

Most external SATA expansion devices on the market use only a single‑channel output, leading to bandwidth contention when multiple drives are accessed simultaneously, which affects read/write performance. Desktop internal multi‑port SATA cards are limited to systems with available PCI slots and cannot be used with laptops or mini PCs.

The device features a USB4 Type‑C upstream interface with 40 Gbps bus bandwidth, compatible with Thunderbolt 3/4/5 hosts – supporting both older and newer Thunderbolt platforms. Internally, it converts the signal into two independent PCIe ×2 channels, compliant with PCIe 4.0/3.0 specifications, providing ample bandwidth for multi‑drive transfers.

Built around the ASM2464PDX bridge chip and the 88SE9215 SATA controller, the two SFF‑8088 ports each belong to a separate PCIe channel, ensuring that read/write operations on the two drive groups do not interfere with each other. This hardware‑level separation reduces data‑processing bottlenecks and minimises stuttering under heavy multi‑drive loads.

Key Technical Features: 8‑Drive SATA Expansion with Practical Storage Enhancements

1. Eight SATA Drive Ports, Compatible with All SATA Media

The device is equipped with two SFF‑8088 output ports, and with the included breakout cables, it expands to eight SATA ports. It can simultaneously connect SATA SSDs and HDDs, and is backward‑compatible with 6 Gbps, 3 Gbps, and 1.5 Gbps transfer rates, ensuring that SATA drives of all generations are recognised and operate normally.

2. Convenient Drive Management Features for Easier Maintenance

• Supports hot‑swapping – drives can be added or removed without rebooting the host, making it easy to swap storage media on the fly.
• Implements Native Command Queuing (NCQ) to intelligently order read/write commands, improving concurrent multi‑drive performance.
• Compliant with the AHCI 1.0 programming interface, with built‑in error detection, correction, and reporting mechanisms to promptly flag abnormal drive conditions.
• Supports MSI interrupt mode, optimising system disk response efficiency and reducing I/O latency.

3. Cross‑Platform Compatibility – Low Deployment Barriers

Compatible with a wide range of mainstream operating systems, covering various usage environments:

• Windows: Windows 10 and Windows 11 desktop editions
• Server / Open Source: All major Linux distributions
• Creative Workstations: macOS

Most systems automatically recognise the hardware upon connection, requiring no complex driver configuration.

4. Complete Accessories and Stable Power Delivery

The package includes all standard accessories for out‑of‑the‑box deployment: a USB4 40 Gbps data cable, a 12V 3A power adapter, SFF‑8088 to 4×SATA breakout cables, and a printed manual. The external dedicated power supply ensures stable operation even when multiple drives are simultaneously accessed. The built‑in LED indicators and power switch let you monitor the device’s status at a glance. With compact dimensions of 116×65×84 mm, the unit occupies minimal desk space.

Real‑World Use Cases: Multi‑Domain External Storage Expansion

1. NAS External Storage Expansion

Home and small‑office NAS devices have limited internal drive bays, making it difficult to store large media libraries or backup archives.

Value proposition: Connect the 8‑drive SATA expansion unit via the host’s USB4/Thunderbolt port to add external storage capacity without replacing the NAS hardware.

Actual performance: Organise daily files and backups in separate tiers; multi‑user access to stored files runs smoothly.

2. Small Studio Storage Server Build

 

Film and design studios require vast storage for 4K footage and project source files, which internal drives cannot accommodate.

Value proposition: A single device expands to eight SATA drives, allowing you to partition media, cache, and final output storage, centralising all creative assets.

Actual performance: During large‑scale media copying and project file loading, multiple drives share the read/write load, reducing bottlenecks.

3. Local AI Inference & Deep Learning Compute Nodes

Training AI models locally demands large datasets; a single drive is limited in both capacity and I/O throughput.

Value proposition: Multiple SATA drives can be pooled into a dataset storage pool, distributing read pressure and reducing GPU idle time waiting for data.

Actual application: Batch dataset reads and offline model storage can leverage this device, fitting local offline compute requirements perfectly.

4. External Storage Upgrade for Port‑Limited Devices (Laptops, etc.)

Thin‑and‑light creator laptops and mini PCs lack extra internal drive bays, and native storage is often limited.

Value proposition: No internal modification is required – simply connect multiple drives via the USB4/Thunderbolt port for a cost‑effective storage upgrade.

Actual performance: The unit is portable enough for on‑the‑go creation or home editing, expanding your media storage capacity.

5. Professional Content Creation Workstation Companion Storage

Video editing, 3D rendering, and audio production generate massive project files that demand high storage capacity.

Value proposition: The 8‑bay external storage can segregate raw footage, project caches, and final renders, offloading the internal drive and reducing system strain.

Actual performance: During multi‑track previews and large‑render exports, storage read/write pressure is distributed evenly across drives.

Comparison: AA24S81 vs. Common External Storage Expansion Solutions

Feature / Specification	Single‑Drive USB Enclosure	Desktop PCIe 8‑Port SATA Card	Loku AA24S81
Host Compatibility	Any device with USB‑C	Only desktops with PCI slots	USB4/Thunderbolt laptops, mini PCs, industrial PCs
Max Drives Supported	Single drive	Up to 8 SATA	Up to 8 SATA
Channel Architecture	Single‑channel shared bandwidth	Multiple independent PCIe channels	Two independent PCIe ×2 channels, no interference
Portability	Compact single‑unit, but stacking multiple creates clutter	Built‑in, non‑portable	Integrated compact chassis, easy to reposition
Power Supply	Bus‑powered, prone to under‑power with multiple drives	Internal chassis power	12V power adapter, stable under load
OS Support	Windows, macOS, Linux	Windows, Linux	Windows 10/11, macOS, all major Linux distributions

Note: Comparisons are based on typical consumer products; actual performance may vary.

Conclusion
The Loku AA24S81 USB4 40G to 8‑Port SATA Expansion Device leverages the ASM2464PDX bridge chip and the 88SE9215 SATA controller to deliver eight SATA drives over a single Thunderbolt/USB4 interface. It supports hot‑swap, NCQ, and other practical disk features, while remaining compatible with Windows, macOS, and Linux. Addressing the lack of internal expansion slots in laptops and mini PCs, it offers an external multi‑drive storage solution for studio media repositories, NAS expansion, local AI compute, professional video production, and more – making it a practical choice for high‑capacity external SATA storage expansion.