Yottamaster FS4C3
Yottamaster 4-Bay USB-C Hard Drive Enclosure (FS4C3) Instruction Manual
Model: FS4C3
Introduction
The Yottamaster FS4C3 is a high-performance 4-bay USB-C hard drive enclosure designed for expanding storage capacity for both 2.5-inch and 3.5-inch SATA HDDs and SSDs. Featuring 10Gbps ultra-fast data transfer speeds and daisy chain capabilities, this enclosure provides a robust and efficient solution for large data storage and management. Its durable aluminum-alloy construction and intelligent cooling system ensure reliable operation.

Figure 1: Front view of the Yottamaster 4-Bay USB-C Hard Drive Enclosure.
Product Features
- Daisy Chain Capability: Supports connecting up to two additional peripheral devices, allowing for a total storage capacity of up to 216TB (with 4x18TB drives per enclosure).
- High-Speed Data Transfer: Utilizes USB3.1 GEN2 (Type-C) protocol, offering transfer rates up to 10Gbps.
- Broad Drive Compatibility: Designed for both 2.5-inch and 3.5-inch SATA HDD/SSDs, with removable aluminum trays for easy installation.
- Robust Construction & Cooling: Features a sleek aluminum-alloy shell and an 80mm intelligent temperature control fan for efficient heat dissipation and quiet operation.
- Stable Power Supply: Equipped with a dual-core chip and a 150W power supply to ensure stable operation for large capacity hard drives.
- Non-RAID Version: This model does not support hardware RAID. Software RAID can be configured using operating system tools (e.g., Disk Utility on Mac OS).

Figure 2: Illustration of the daisy chain capability, connecting multiple enclosures.

Figure 3: Diagram showing the internal cooling fan and airflow for optimal heat dissipation.
Package Contents
Please verify that all items are present in the package:
- Yottamaster 4-Bay USB-C Hard Drive Enclosure (FS4C3)
- Power Adapter (150W)
- USB-C to USB-C Data Cable
- USB-C to USB-A Data Cable
- Screws for hard drive installation
- Screwdriver
- User Manual (this document)
Setup Guide
1. Installing Hard Drives
The enclosure supports both 2.5-inch and 3.5-inch SATA HDDs/SSDs. Ensure the enclosure is powered off before installation.
- Gently pull out the drive trays from the front of the enclosure.
- Place your 2.5-inch or 3.5-inch SATA HDD/SSD onto the tray. Align the screw holes on the drive with those on the tray.
- Secure the hard drive to the tray using the provided screws and screwdriver. This protects the drive from shock and interface damage.
- Slide the loaded tray back into the enclosure until it clicks into place. Repeat for all desired drives.

Figure 4: Illustration of installing hard drives into the enclosure trays.
2. Connecting the Enclosure to Your Computer
- Connect the provided 150W power adapter to the AC power port on the rear of the enclosure and then to a power outlet.
- Connect one end of the USB-C data cable (or USB-C to USB-A cable) to the "Main" USB-C port on the rear of the enclosure.
- Connect the other end of the data cable to an available USB-C or USB-A port on your computer.
- Ensure the power switch on the rear of the enclosure is in the "OFF" position before connecting power, then switch it to "ON".

Figure 5: Detailed view of the rear panel showing AC power, USB-C ports (Main and HUB), and power switch.
3. Daisy Chain Connection (Optional)
To expand your storage capacity further, you can daisy chain up to two additional Yottamaster enclosures (FS4C3 or FS5C3 models).
- Ensure each enclosure in the daisy chain is connected to its own AC power supply.
- Connect the "HUB" port of the first enclosure (Device 1) to the "Main" port of the second enclosure (Device 2) using a USB-C to USB-C data cable.
- If connecting a third enclosure (Device 3), repeat the previous step: connect the "HUB" port of Device 2 to the "Main" port of Device 3.
- The computer should only be connected to the "Main" port of the first enclosure in the chain.

Figure 6: Diagram illustrating the connection of multiple enclosures in a daisy chain configuration.
Operating Instructions
1. Powering On/Off
To power on the enclosure, ensure all cables are connected, then flip the power switch on the rear panel to the "ON" position. To power off, flip the switch to "OFF". Always ensure data transfer is complete before powering off to prevent data loss.
2. Drive Recognition and Formatting
Upon connecting and powering on, your operating system (Windows, macOS, Linux) should detect the enclosure. For brand new hard drives, they may not appear immediately in your file explorer. You will need to initialize, partition, and format them using your operating system's Disk Management utility (Windows), Disk Utility (macOS), or equivalent tools (Linux).
Important: Always back up any existing data on drives before formatting, as formatting will erase all data.
3. Data Transfer
Once drives are recognized and formatted, you can begin transferring data. The enclosure supports up to 10Gbps transfer speeds, but actual speeds may vary depending on your hard drives' performance, computer's USB port capabilities, and the type of data being transferred.
Maintenance
- Cleaning: Use a soft, dry cloth to clean the exterior of the enclosure. Do not use liquid cleaners or aerosols.
- Ventilation: Ensure the cooling vents and fan are not obstructed to maintain proper airflow and prevent overheating.
- Drive Health: Regularly check the health of your hard drives using appropriate software tools.
- Firmware Updates: Periodically check the Yottamaster official website for any available firmware updates for your model, as these can improve performance or address issues.
Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| Enclosure not detected by computer. | Loose cable connection, insufficient power, uninitialized/unformatted drives, incorrect USB port. |
|
| Slow data transfer speeds. | Older USB port (e.g., USB 2.0), slow hard drive performance, cable quality. |
|
| Drives frequently go to sleep or disconnect. | Default sleep timer settings, power management issues. |
|
| Enclosure is hot. | Heavy usage, obstructed airflow. |
|
Technical Specifications
| Model Number | FS4C3 |
| Material | Aluminum Alloy |
| Number of Bays | 4 |
| Supported Drive Types | 2.5-inch / 3.5-inch SATA HDD/SSD |
| Max Single Drive Capacity | Up to 18TB |
| Max Total Capacity (Single Enclosure) | Up to 72TB (4 x 18TB) |
| Max Total Capacity (Daisy Chain) | Up to 216TB (with 3 daisy-chained enclosures) |
| Interface | USB 3.1 Gen 2 Type-C |
| Data Transfer Rate | Up to 10Gbps |
| Power Supply | External 150W Power Adapter |
| Cooling System | 80mm Silent Fan with Intelligent Temperature Control |
| Dimensions (L x W x H) | 10.43 x 5.39 x 6.57 inches (26.5 x 13.7 x 16.7 cm) |
| Item Weight | 7.94 pounds (3.6 kg) |
| Compatible Operating Systems | Windows, macOS, Linux |
Warranty and Support
Yottamaster products come with a standard manufacturer's warranty. For specific warranty terms and conditions, please refer to the warranty card included with your product or visit the official Yottamaster website. If you encounter any issues or have questions regarding your Yottamaster FS4C3 enclosure, please contact Yottamaster customer support through their official website or the contact information provided in your product packaging.
For the latest drivers, firmware updates, and support resources, please visit: www.yottamaster.com
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