Lexar RW310
Lexar RW310 Memory Card Reader User Manual
Model: RW310
1. Introduction
The Lexar RW310 Memory Card Reader is a versatile 2-in-1 device designed for efficient data transfer from various memory cards to your computer or mobile devices. Featuring both USB-C and USB-A connectors, it supports SD and Micro SD card formats, leveraging USB 3.2 Gen 1 technology for fast read and write speeds.
2. Product Overview
The Lexar RW310 is a compact and portable memory card reader that simplifies file management. It features dedicated slots for SD and Micro SD cards, eliminating the need for adapters. Its dual USB-A and USB-C interface ensures broad compatibility with a wide range of devices.

Image 1: The Lexar RW310 Memory Card Reader highlighting its USB 3.2 Gen 1 interface and read/write speeds of up to 170MB/s.

Image 2: A detailed view of the Lexar RW310, illustrating its dual-slot design for both standard SD cards and Micro SD cards.

Image 3: The compact and portable design of the Lexar RW310 Memory Card Reader, shown held in a hand, with its dimensions (Length 78mm, Width 23.4mm, Height 11.8mm).
3. Setup
The Lexar RW310 Memory Card Reader is designed for plug-and-play functionality, requiring no additional software installation for most operating systems.
3.1 Connecting the Card Reader
- Identify the correct connector: The RW310 features both a standard USB-A connector and a reversible USB-C connector. Select the appropriate connector for your device (PC, laptop, smartphone, or tablet).
- Insert into device: Plug the chosen connector firmly into an available USB port on your host device.
- Operating System Recognition: Your operating system (Windows, macOS, iOS, Android) should automatically detect the card reader.

Image 4: The Lexar RW310 Memory Card Reader showcasing its dual USB-C and USB-A connectivity options, compatible with various devices.

Image 5: The Lexar RW310 Memory Card Reader demonstrating its plug-and-play capability across Windows, Mac OS, and Android operating systems without requiring software installation.
4. Operating the Card Reader
4.1 Inserting Memory Cards
- For SD Cards: Gently slide the SD card into the larger slot until it clicks into place. Ensure the card is inserted with the contacts facing down.
- For Micro SD Cards: Gently slide the Micro SD card into the smaller slot until it clicks into place. Ensure the card is inserted with the contacts facing down.
4.2 Accessing Data
Once the card reader is connected and a memory card is inserted, your operating system will typically display the card as a removable drive. You can then access, copy, move, or delete files as you would with any other storage device.
4.3 On-The-Go (OTG) Functionality
The RW310 supports OTG (On-The-Go) functionality, allowing you to transfer files directly to and from compatible USB-C smartphones and tablets. This is ideal for quickly offloading photos or videos from your camera's memory card to your mobile device.

Image 6: The Lexar RW310 Memory Card Reader in use with a USB-C enabled smartphone, illustrating its On-The-Go (OTG) capability for direct file transfers.
4.4 Ejecting Memory Cards
Before removing a memory card, always safely eject it from your operating system to prevent data corruption. For Micro SD cards, press the card gently to release the spring-lock mechanism, then pull it out. For SD cards, simply pull it out after safe ejection.
5. Maintenance
- Keep Clean: Regularly clean the card reader's slots and connectors using a soft, dry, lint-free cloth. Avoid using liquids or abrasive cleaners.
- Protect Connectors: Use the provided caps to protect the USB-A and USB-C connectors from dust and damage when not in use. While the caps are designed for protection, ensure they are securely stored to prevent loss, especially during transport.
- Storage: Store the card reader in a cool, dry place away from direct sunlight and extreme temperatures.
- Handle with Care: Avoid dropping the device or subjecting it to strong impacts.
6. Troubleshooting
6.1 Device Not Recognized
- Check Connection: Ensure the card reader is firmly plugged into the USB port. Try a different USB port or a different host device.
- Restart Device: Sometimes, restarting your computer, smartphone, or tablet can resolve recognition issues.
- Check Card: Ensure the memory card is correctly inserted into the reader. Try a different memory card to rule out a card issue.
- Driver Issues: While plug-and-play, ensure your operating system's USB drivers are up to date.
6.2 Slow Data Transfer Speeds
- USB Port: Ensure you are using a USB 3.0/3.1/3.2 port on your host device for optimal speeds. Connecting to a USB 2.0 port will result in slower transfers.
- Memory Card Speed: The actual transfer speed is limited by the slowest component, which can be the memory card itself. Ensure your memory card is rated for high speeds (e.g., UHS-I, UHS-II).
- Other USB Devices: Disconnect other high-bandwidth USB devices that might be competing for bandwidth.
6.3 Memory Card Not Reading
- Card Insertion: Verify the card is fully and correctly inserted into its slot.
- Card Condition: Inspect the memory card for physical damage or dirt on the contacts.
- Format: Ensure the memory card is formatted in a file system compatible with your operating system (e.g., FAT32, exFAT, NTFS).
7. Specifications
| Feature | Detail |
|---|---|
| Brand | Lexar |
| Model Number | LRW310U-BNBNG |
| Media Type Supported | SD Card, SDHC, SDXC, microSD, microSDHC, microSDXC |
| Connectivity Technology | USB, USB Type A, USB Type C |
| Hardware Interface | MicroSD, USB, USB Type C, microSDXC |
| Data Transfer Rate | Up to 170MB/s (USB 3.2 Gen 1), 480 megabits per second (theoretical max for USB 2.0 fallback) |
| Slot Count | 2 (1x SD, 1x MicroSD) |
| Compatible Devices | Laptop, Smartphone, PC, Tablet |
| Operating System Support | Windows, macOS, iOS, Android |
| Special Feature | Compact, Plug & Play |
| Item Dimensions (L x W x H) | 3.07" x 0.92" x 0.46" (78mm x 23.4mm x 11.8mm) |
8. Warranty Information
Lexar products are backed by a limited warranty. For specific warranty terms and conditions applicable to your region and product, please refer to the official Lexar website or the warranty card included with your purchase. Keep your proof of purchase for warranty claims.
9. Customer Support
For technical assistance, product inquiries, or further support, please visit the official Lexar support website. You can find FAQs, driver downloads (if applicable), and contact information for customer service.
Lexar Official Website: www.lexar.com
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