Validrive
ValiDrive checks USB storage devices for fraudulent or fake capacity claims.
About Validrive
ValiDrive is a free web-based utility from GRC that detects fraudulent USB mass storage drives with fake capacity claims. It targets a growing market of low-cost drives that advertise large storage sizes (such as 1TB or 2TB) but contain only a small fraction of actual flash storage. The tool runs a quick, random-sequence spot-check across the drive's entire declared storage capacity, verifying that unspoofable test data can be successfully stored and retrieved at every location. This identifies drives that silently discard data written beyond their real storage limit, which can result in empty files even when the operating system reports a successful write.
Key features
- Detects fraudulent USB drives with misrepresented storage capacity
- Performs random spot-checks across the entire declared drive space
- Verifies storage and retrieval of unspoofable random test data
- Generates visual drive maps showing actual vs advertised capacity
- Free web-based tool with no local installation required
- Identifies drives that silently discard data beyond real storage
- Identifies a widespread, hard-to-detect USB drive fraud that standard operating system checks miss
- Free web-based utility with no required local installation
- Uses random unspoofable test data to prevent fraudulent drives from faking successful capacity checks
Validrive at a glance
- Website
- grc.com/validrive.htm
- Category
- Software & Utilities › Hardware & Diagnostics
- Type
- Website
- Pricing
- Not confirmed. Check the site
- Platforms
- Web
- Open source
- Not stated
- Language
- English
- Last checked
- Oct 6, 2026 · Online when checked
- Listed
- Oct 5, 2026
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Validrive FAQ
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