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ValiDrive
Laguna Hills, California, USA
What it is
ValiDrive is a free Windows utility for quickly checking USB mass-storage drives for deliberately missing storage. It tests 576 evenly spaced locations with random data, verifying that each location can store and retrieve information. Before testing, it reads the original contents; afterward, it rewrites them to restore what was there. The utility detects internal RAM caching and adjusts transfer sizes when needed to bypass it. A drive map labels each tested location as validated, read error, write error, or no storage. The final report summarizes read and write access times using minimum, maximum, average, median, and variance values. The maker describes ValiDrive as a quick, cursory spot-check rather than a comprehensive deep test. While running, it briefly checks for updates through an anonymous DNS query but does not update automatically. Listed releases are v1.0.0 from October 6, 2023, and v1.0.1 from October 8, 2023.
For and against
For
- Checks 576 evenly spaced drive locations
- Restores original data after each test
- Accounts for internal RAM caching
- Clear map of storage and access errors
- Free Windows utility
Against
- Only a quick, cursory spot-check
- Not a comprehensive deep storage test
- Windows platform only
The verdict
ValiDrive offers a focused way to spot-check suspicious USB capacity without leaving tested data changed. Its classifications and timing statistics add detail, while the limited test scope should guide expectations.
Who it suits
It suits Windows users who want a quick indication of whether a USB drive reports storage it cannot actually provide. It is not presented as a full media examination.
Plans and prices
ValiDrive
Quick, cursory spot-check of 576 drive locations
Read 7 Oct 2026 · grc.com
On the record
- Access statistics
- The final report summarizes read and write access-time statistics, including minimum, maximum, average, median, and variance.grc.com · read 7 Oct 2026
- Cache handling
- ValiDrive detects internal RAM caching and adjusts the transfer size needed to bypass it when necessary.grc.com · read 7 Oct 2026
- Drive map
- Each tested location is classified as validated, read error, write error, or no storage.grc.com · read 7 Oct 2026
- Internet check
- When it runs, ValiDrive briefly checks for updates through an anonymous DNS query; it does not automatically update itself.grc.com · read 7 Oct 2026
- Maker
- Gibson Research Corporation is owned and operated by Steve Gibson, and the page identifies Laguna Hills, California, USA.grc.com · read 7 Oct 2026
- Preserves data
- At each tested region, ValiDrive reads the original contents and rewrites them after its test, restoring whatever data was originally there.grc.com · read 7 Oct 2026
- Purpose
- ValiDrive quickly spot-checks USB mass storage drives for deliberately missing storage.grc.com · read 7 Oct 2026
- Release history
- The listed releases are v1.0.0 from October 6, 2023 and v1.0.1 from October 8, 2023.grc.com · read 7 Oct 2026
- Storage verification
- It tests 576 evenly spaced locations using random data to verify that data can be stored and retrieved.grc.com · read 7 Oct 2026
- Support
- GRC directs users to its active web forums and says it provides sales and technical support by email rather than telephone.grc.com · read 7 Oct 2026
- Testing limit
- The maker describes ValiDrive as a quick, cursory spot-check rather than a comprehensive deep test of storage media.grc.com · read 7 Oct 2026
- Windows support
- The FAQ describes running ValiDrive on Windows, including Windows 11 ARM under Parallels with Safe Emulation enabled.grc.com · read 7 Oct 2026
