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USB flash drive and SD card tester for Windows. Catches fake capacity by writing real data and reading it back, then checks speed, finds duplicate files, compares and copies folders, and wipes free space to make recovery harder. Windows GUI plus command line, free and open source.
Tests USB sticks, SD cards and disks for fake capacity, data loss and speed: h2testw plus a quick capacity probe, raw mode and reports. Windows, Linux, FreeBSD.
Fake "4 TB" USB hard disk (HDD Elements box, U2SATA, VID_1122 PID_3344): stores 320 GB, silently loses the rest, USB 2.0. Measurements, evidence and a fast capacity probe.