USB Drive Toolkit

USB Drive Toolkit turns your Android phone into a USB drive workbench. Plug in a flash drive, USB SSD or card reader with a USB-C or OTG adapter – no root and no computer needed.

★ CATCH FAKE-CAPACITY DRIVES
Cheap "512 GB" sticks often hold only a fraction of what they claim. The capacity check writes test data across the whole drive and reads it back to find its real size.
• Quick check: samples spots across the drive and puts your data back exactly as it was
• Full check: tests every byte and stops early once a drive is clearly fake
• SD card check: tests the free space of the phone's built-in card slot
• A live map shows which parts of the drive kept their data

★ FORMAT ANY USB DRIVE
• FAT32, exFAT, NTFS, ext4 or FAT16
• MBR or GPT partition table
• Choose the cluster size and volume label
• Format a fake drive down to its real size, so nothing you store gets lost

★ MEASURE REAL SPEED
• Sequential read and write
• Random 4K read and write (IOPS)
• Several runs with the median shown, plus a history of past results

★ DRIVE INFO
Model, capacity, USB speed, partition table and file systems at a glance.

★ PRIVATE BY DESIGN
Everything happens on your phone. Your files and drive contents never leave the device.

GOOD TO KNOW
• Requires a phone with USB OTG support and an adapter or USB-C drive.
• Formatting and the full capacity check erase the selected drive. Back up important files first.
• Android manages the built-in SD card slot itself, so the app formats it through Android's settings and tests it through files.
• Some USB enclosures that only support the UAS protocol can't be used.

Available in English, Español, Français, Deutsch, Português, Tiếng Việt, 简体中文, 日本語, 한국어, हिन्दी and العربية.

Questions or feedback: tuantruong.a8k29@gmail.com

Recent changes:
Fix some crash, and adjust preferences