1. Introduction
This manual provides essential information for the proper setup, operation, maintenance, and troubleshooting of your SanDisk 128GB Ultra Fit USB 3.2 Gen 1 Flash Drive. This ultra-compact, plug-and-stay design allows for easy expansion of storage on various devices with fast data transfer speeds.
2. Setup
2.1 Inserting the Flash Drive
The SanDisk Ultra Fit USB 3.2 Gen 1 Flash Drive features a compact design for seamless integration. To use, simply insert the drive into an available USB-A port on your device.
- Locate an available USB-A port on your laptop, desktop computer, game console, in-car audio system, or other compatible device.
- Align the metal connector of the SanDisk Ultra Fit drive with the USB-A port.
- Gently push the drive into the port until it is fully seated. The plug-and-stay design ensures it remains securely in place.

Figure 1: SanDisk Ultra Fit USB 3.2 Gen 1 Flash Drive inserted into a laptop, demonstrating its compact, plug-and-stay design.
2.2 Device Compatibility
The drive is designed for broad compatibility:
- USB 3.2 Gen 1: For optimal performance, connect to a USB 3.2 Gen 1 compatible port.
- Backwards Compatible: The drive is backwards compatible with USB 3.0 and USB 2.0 ports, though transfer speeds will be limited by the older USB standard.

Figure 2: The SanDisk Ultra Fit Flash Drive is compatible with a wide range of devices.
3. Operating
3.1 Data Transfer
The SanDisk Ultra Fit USB 3.2 Gen 1 Flash Drive offers fast data transfer speeds, up to 400MB/s (read speed). This allows for quick movement of large files.
- Once inserted, the drive should appear as a removable storage device in your computer's file explorer or equivalent.
- To transfer files, drag and drop them from your computer to the drive, or vice versa.
- For optimal speed, ensure you are using a USB 3.0 or USB 3.2 Gen 1 port. Transferring a 1.2GB MPEG-4 video can take less than 30 seconds with a compatible host device.

Figure 3: High-speed USB 3.2 Gen 1 performance for quick file transfers.
3.2 Password Protection
For enhanced security, you can password-protect your files using downloadable software from the SanDisk website.
- Visit the official SanDisk website and navigate to the support section for your specific model.
- Download and install the recommended password protection software.
- Follow the on-screen instructions to set up password protection. This feature uses 128-bit AES encryption and is supported by Windows 10+ and macOS v10.9+.

Figure 4: Easy file recovery with RescuePRO Deluxe Software (downloadable).
4. Maintenance
4.1 General Care
To ensure the longevity and optimal performance of your flash drive, follow these general care guidelines:
- Keep the drive dry and away from liquids.
- Avoid exposing the drive to extreme temperatures (hot or cold).
- Store the drive in a clean, dust-free environment when not in use.
- Handle the drive gently to prevent physical damage to the connector or casing.
4.2 Safe Removal
Always safely eject the flash drive from your device before physically removing it to prevent data corruption or loss:
- Windows: Right-click on the drive icon in 'This PC' or the system tray, then select 'Eject'.
- macOS: Drag the drive icon to the Trash, or click the Eject button next to the drive name in Finder.
5. Troubleshooting
5.1 Drive Not Recognized
- Ensure the drive is fully inserted into the USB port.
- Try inserting the drive into a different USB port on your device.
- Test the drive on another computer to determine if the issue is with the drive or your original device.
- Update your computer's USB drivers.
5.2 Slow Transfer Speeds
- Verify that the drive is connected to a USB 3.0 or USB 3.2 Gen 1 port. Older USB 2.0 ports will significantly limit speeds.
- Ensure your computer's operating system and drivers are up to date.
- Large numbers of small files transfer slower than a few large files of the same total size.
5.3 Data Recovery
In case of accidental data deletion or corruption, SanDisk offers RescuePRO Deluxe Software (sold separately or as a bundled offer) which can help recover lost files. Refer to the SanDisk website for more details and download instructions.
6. Specifications
| Feature | Detail |
|---|---|
| Brand | SanDisk |
| Model Name | SanDisk Ultra Fit USB 3.2 Gen 1 Flash Drive |
| Item Model Number | SDCZ430-128G-GAM46 |
| Memory Storage Capacity | 128 GB |
| Hardware Interface | USB 3.2 Gen 1 |
| Hardware Connectivity Technology | USB Type A |
| Read Speed | Up to 400 Megabytes Per Second |
| Write Speed | Less than 150 MB/s |
| Special Feature | Compact, Plug-and-Stay Design |
| Color | Black |
| Product Dimensions | 1.17"D x 0.56"W x 0.2"H |
| Item Weight | 0.32 ounces |
7. Product Videos
The following videos provide additional information and comparisons related to the SanDisk Ultra Fit USB 3.2 Gen 1 Flash Drive:
SanDisk Ultra Fit vs Kingston Data Exodia USB
This video compares the SanDisk Ultra Fit USB 3.2 Gen 1 Flash Drive with the Kingston DataTraveler Exodia USB drive, highlighting size, storage capacity, and transfer speeds. It demonstrates the compact nature of the Ultra Fit drive and its attachment features.
SanDisk Ultra Curve USB vs SanDisk Ultra Fit USB
This video provides a comparison between the SanDisk Ultra Curve USB and the SanDisk Ultra Fit USB, focusing on their physical design, portability, and storage capacities to help users choose based on their preference for size and form factor.
8. Warranty & Support
8.1 Product Warranty
Your SanDisk Ultra Fit USB 3.2 Gen 1 Flash Drive is covered by a manufacturer's limited warranty. Please refer to the packaging or the official SanDisk website for specific warranty terms and conditions applicable to your region.
8.2 Customer Support
For technical assistance, product registration, or further information, please visit the official SanDisk support website:
- SanDisk Support: www.sandisk.com/support





