Jazz Disk Bench - Disk Speed

Chang Studio

About this app

Jazz Disk Bench: Pro Storage Benchmark

Accurately measure the performance of your phone's internal storage (UFS/EMMC), SD cards, and external drives. Compare results across platforms with our consistent testing engine.

Key Features:
* Precise Testing: Sequential and 4K Random read/write speeds.
* Stress Test: 2GB–100GB tests to evaluate sustained NAND speed and SLC cache.
* Cross-Platform: Industry-standard methods for comparable scores.
* External Support: Test USB drives and SD cards via custom folder selection.
* Zero Bloat: No ads, no bloat, no unnecessary permissions.

Benchmark Modes:
1. Sequential: Measures peak speed for large file transfers (movies/games).
2. 4K Random: Measures IOPS and responsiveness. Low random speed is the primary cause of system lag.
3. Stress Test: Evaluates stability and thermal throttling during long-duration write tasks.

Note: Ensure a stable connection for external storage tests.

Ratings and reviews

Very useful app for measuring speed of device's flash disk. I recommend this app

App is not opening keeps on crashing

works very well

What’s new

Fix the bug of external storage(SDCard & USB drive) permission on some devices.