Jazz Disk Bench Pro

Accurate disk storage speed test and benchmark. Sequential, 4K random, and stress test.

Jazz Disk Bench is a pro-grade storage performance measurement tool designed for SSDs, SD cards, and internal/external storage. Get accurate data on your device's throughput with industry-standard testing methods.

Key Features:

• Sequential Speed Test: Measure peak performance for copying large files (movies, games, etc.).
• 4K Random IOPS: Evaluate system responsiveness. Low random performance is often the root cause of device lag.
• Pro Stress Test: Push your storage to the limit with 2GB–100GB tests to check stability and "real" NAND speed after cache exhaustion.
• External Storage Support: Fully compatible with USB drives and SD cards via custom folder selection.

Benchmark Details:

• Sequential Test: Reads/writes 16MB blocks sequentially. Perfect for testing raw transfer speeds.
• Random Test (4K): Reads/writes 4KB blocks at random locations. This reflects how fast your OS launches apps and handles small files.
• Stress Test: Sequentially writes massive data (up to 100GB). Ideal for pro users to test SLC cache size and sustained NAND write performance.

Note: For external storage tests, ensure a stable connection and write permissions.