A Comprehensive Performance Test of SanDisk's Affordable USB 3.0 Flash Drive

The SanDisk Ultra 128GB Flash USB 3.0 Drive offers a mix of performance, portability, and reliability for those seeking a cost-effective way to transfer large files. In this review, we take a deep dive into its real-world performance using industry-standard benchmarks with CrystalDiskMark 8.0.5. Whether you're storing documents, videos, or software — does it deliver on its promise?

Performance Testing with CrystalDiskMark 8.0.5

To thoroughly evaluate the drive, we ran a series of tests using CrystalDiskMark 8.0.5, a popular benchmarking tool trusted by tech enthusiasts and professionals.

Test 1: Default Profile [+Mix] — R70%/W30%

The first test used the Default [+Mix] profile with a Mix Ratio of R70%/W30% to simulate general-purpose use where read and write operations are mixed. With 5 test iterations and a 1GiB test size, we measured the drive's read and write speeds in MB/s.

Test 2: Read-Heavy Mix Profile — R90%/W10%

For the second test we adjusted the Mix Ratio to R90%/W10%, prioritizing read operations — closer to typical usage such as opening files or reading documents. Same 5 test count and 1GiB test size.

Test 3: Real-World Performance Profile

The final test used the Real World Performance profile, simulating real-life use cases such as transferring files, running applications, and copying media. Unlike the previous tests, this measured overall read and write speeds based on real-world data transfer rates.

Design and Build Quality

The SanDisk Ultra 128GB Flash USB 3.0 Drive features a sleek, compact design that fits comfortably in your pocket or bag. The drive is encased in a durable plastic shell offering a reliable grip and lightweight feel. A red-and-black color scheme gives it a professional yet sporty look.

The retractable USB 3.0 connector helps protect the plug from wear and tear when not in use. The absence of a cap makes it convenient but may leave it susceptible to dust or debris.

Speed vs. Price: Is It Worth It?

One of the standout features of the SanDisk Ultra 128GB is its affordable price point relative to competitors. It offers a good balance between speed and value for everyday use — document transfers, backups, and media storage.

However, if you require blazing fast speeds for tasks like editing large videos or running programs directly off the drive, you may want to consider a USB 3.1 or 3.2 option, which will be faster but at a higher price.

Final Thoughts

After running all three tests, the SanDisk Ultra 128GB Flash USB 3.0 Drive is an excellent choice for anyone looking for a budget-friendly, reliable USB drive. It excels at everyday tasks and handles document storage and data transfer with decent speed. At its price point, it offers a solid balance of performance and cost for users who prioritize value over ultra-high-speed transfers.

Pros & Cons

Should You Buy It?

If you need a budget-friendly USB flash drive for basic tasks like transferring documents, media, and data backups, the SanDisk Ultra 128GB is a solid choice. Its affordable pricing and decent read/write speeds make it a great option for everyday users.

However, for high-speed video editing, running large programs, or rapid large-file transfers, opt for something with USB 3.1 or 3.2 support.

Where to Buy

The SanDisk Ultra 128GB Flash USB 3.0 Drive is available on major online retailers such as Amazon, Best Buy, and Walmart, typically priced between $20–$30 (prices may vary by location and promotion).