Corsair EX300U 1TB Portable USB-C Review: Specs, Pros and Cons

What stands out

• Up to 1,100MB/sec read and write speeds over USB 3.2 Gen 2
• Magnetic ring for secure attachment to phones or metal surfaces
• Works natively with Windows, macOS, iOS, iPadOS, and Android
• Compact dimensions of 2.53 x 2.52 x 0.47 inches
• Lightweight at 1.33 ounces for easy pocket carry

Who it fits

Key specs explained

Storage Capacity: 1TB

This drive holds one terabyte of data. You can store roughly five hundred hours of HD video or thousands of high-resolution photos. This capacity suits users who need a portable backup for creative projects or game libraries. When comparing to internal NVMe drives, note that this external unit offers similar storage but with added portability for mobile workflows.

Interface: USB 3.2 Type-C Gen 2

The drive connects via a USB-C port supporting Gen 2 speeds. This interface provides a maximum bandwidth of 10Gbps. You will need a compatible port on your computer or phone to achieve the listed speeds. This standard is common in modern laptops and smartphones, ensuring broad compatibility without needing adapters for most current devices.

Max Read Speed: Up to 1,100MB/sec

The drive can read data at speeds up to 1,100 megabytes per second. This allows you to launch large applications or edit 4K video files directly from the drive without significant lag. Compare this to standard SATA SSDs, which typically cap around 550MB/sec. The higher speed makes this drive better for time-sensitive tasks like video editing.

Max Write Speed: 1,100MB/sec

You can write data to the drive at up to 1,100MB/sec. This speed helps when backing up large files or saving game updates quickly. Faster write speeds reduce the time your computer spends idle while transferring data. This performance level is suitable for users who frequently move large media files between devices.

Form Factor: External

This is a portable external drive designed for mobility. It connects via cable and does not require internal installation. You can easily carry it in a pocket or bag. This form factor is ideal for users who switch between multiple computers or need extra storage for laptops and tablets that lack sufficient internal space.

Design and build details

According to the listing, the Corsair EX300U measures 2.53 inches in length, 2.52 inches in width, and 0.47 inches in height. It weighs 1.33 ounces. These dimensions make it small enough to fit in your pocket. The compact form factor allows you to carry it without adding bulk to your bag or workspace. You can easily slip it into a jacket pocket or a small camera bag for travel.

The drive features a gray finish. It includes a magnetic ring designed for MagSafe compatibility. This ring allows the drive to attach securely to mobile phones or other metal surfaces. You can stick it to the back of your phone or a metal desk surface. This layout keeps the drive within reach while you work. It reduces the risk of dropping the unit or losing it in a bag.

The external enclosure is built to withstand travel. The listing describes it as tough enough to go wherever your workflow takes you. You do not need a separate case for basic protection. The USB-C connection is integrated into the unit. This design eliminates loose cables that might get tangled or damaged. You get a clean, simple setup that connects directly to your device. The build supports a mobile lifestyle where space and durability matter.

Setup and everyday use

You do not need to install drivers or software to use this drive. The listing states it works out of the box with Windows, macOS, iOS, iPadOS, and Android OS. You simply connect the USB Type-C cable to your device. The drive powers itself through the host connection. This plug-and-play design means you can start transferring files immediately. The USB 3.2 Type-C Gen 2 interface provides up to 10Gbps bandwidth. This connection supports sequential read and write speeds of up to 1,100MB/sec. You can move large creative projects or backup data quickly. The magnetic ring allows the drive to attach securely to compatible mobile phones or other metal surfaces. This feature keeps the drive handy during travel. You can keep it attached to your phone case or laptop sleeve. The compact dimensions of 2.53 by 2.52 inches and a height of 0.47 inches fit easily into pockets or bags. The 1.33-ounce weight adds minimal bulk to your carry. Daily use involves plugging the drive into a USB-C port on your computer or mobile device. The gray finish blends with most tech accessories. You can store games, videos, and documents without managing internal storage limits. The drive is tough enough to handle your workflow. It is small enough to go wherever you go. This setup suits users who need reliable, fast access to their files on multiple platforms.

Before you buy this drive

You should verify your host device supports USB 3.2 Gen 2 for the stated 1,100MB/sec speeds. Older ports may throttle performance significantly. Ensure your smartphone or tablet has USB-C and supports OTG functionality if you plan to use the MagSafe ring for mobile attachment. This drive is not a traditional internal NVMe or SATA SSD. It lacks a PCIe or SATA interface for direct motherboard connection. You need it only for external, portable storage workflows. Keep the included cable safe, as losing it may complicate use. The compact size fits easily in pockets, but the magnetic ring requires a metal surface or compatible case. Consider if you need more than 1TB for large video libraries. If you require internal expansion, look at bare drives instead. This model suits users who prioritize mobility and quick file transfers over internal integration. Check your device’s power delivery limits if connecting to older hubs.

Check before you buy

• Confirm host device supports USB 3.2 Gen 2 for max speed.
• Verify smartphone or tablet supports OTG for mobile use.
• Check if your phone case has a metal back for MagSafe.
• Ensure you need external portable storage, not internal drive expansion.

The product at a glance

1

Corsair EX300U 1TB Portable USB-C SSD

Best for: mobile creators needing MagSafe mounting

Storage Capacity

1TB

Interface

USB 3.2 Type-C Gen 2

Form Factor

External

Max Read Speed

Up to 1,100MB/sec

Max Write Speed

1,100MB/sec

Compatibility

Mac

View on Amazon: Corsair EX300U 1TB Portable USB-C SSD Affiliate link

The Corsair EX300U 1TB is a compact external SSD with USB 3.2 Gen 2 connectivity. It delivers read and write speeds up to 1,100MB/sec. The drive includes a MagSafe-compatible magnetic ring for easy attachment to phones or metal surfaces. It works directly with Windows, macOS, iOS, iPadOS, and Android. Its small size and light weight make it suitable for travel and mobile workflows.

Pros

• USB 3.2 Type-C Gen 2 interface
• Read and write speeds up to 1,100MB/sec
• MagSafe-compatible magnetic ring for mounting
• Multiplatform support for iOS and Android
• Lightweight at 1.33 ounces

Cons

• Limited to 1TB storage capacity
• No included software for drive management
• Relies on magnetic attachment which may detach if bumped

Good fit if

• You need fast file transfers for creative projects
• You want to attach the drive to your phone via MagSafe
• You require a drive compatible with multiple operating systems

Skip if

• You need more than 1TB of storage space
• You require USB 3.2 Gen 2 speeds exceeding 1,100MB/sec
• You prefer a drive with built-in software features

Verdict: Corsair EX300U 1TB Portable SSD fits users who need a fast, compact drive with MagSafe compatibility for mobile devices. It is ideal for creators moving large files across different platforms.

Specifications side by side

Frequently asked questions

See also

• corsair ex300u 1tb portable external alternatives
• best corsair 2TB nvme SSDs
• seagate portable 1tb external hard review
• corsair rm1000e review