Disk Speed: SD & Storage Test

Disk Speed measures the real read and write speed of your phone storage, SD card and USB drive. Tests use Direct I/O to bypass the cache, so you see true performance instead of inflated numbers.

KEY FEATURES

• Sequential and random 4K read/write tests at QD1, QD8 and QD32

• DiskSpeed Score with a grade and ranking against popular phones

• See what your storage can handle: 4K/8K video, RAW capture, app launches and game loading

• SQLite database and mixed 70/30 workload benchmarks

• 7 test profiles: Quick, Standard, Extended, Sustained write, Thermal stability, Fake card check and Custom

• Fake SD card check that verifies real capacity and data integrity

• Sustained write test that finds where the SLC cache runs out

• Test internal storage, microSD cards, USB OTG drives or any folder

• Detects storage type (UFS / eMMC) and shows file system and chip details

• History with a score trend and side-by-side comparison of any two runs

• Storage analyzer showing how much space apps, photos, videos and files use

• Export results as CSV or JSON, share a result card and add a home screen widget

PERFECT FOR

Checking whether a new microSD card is genuine, choosing the right card for 4K recording, comparing phones before you buy, or finding out if slow storage is making your device lag.

No account needed. Temporary test files are cleaned up automatically.