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ValiDrive

grc.com

Free plan Windows
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Spec score 7.0 #21 of 26 in Disk Diagnostic Software

What it is

ValiDrive is a free Windows utility for quickly spot-checking USB mass storage drives for deliberately missing storage. It tests 576 evenly spaced locations with random data, checking whether each location can store and retrieve information. Before testing a region, it reads the original contents and rewrites them afterward, restoring what was there. The utility detects internal RAM caching and adjusts transfer size 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 with minimum, maximum, average, median, and variance values. The maker describes this as a quick, cursory check rather than a comprehensive deep test of storage media. While running, it briefly checks for updates through an anonymous DNS query but does not update itself automatically. Listed releases are v1.0.0 from October 6, 2023 and v1.0.1 from October 8, 2023.

Spec sheet

Purpose
ValiDrive quickly spot-checks USB mass storage drives for deliberately missing storage.Read 7 Oct 2026 · grc.com
Support
GRC directs users to its active web forums and says it provides sales and technical support by email rather than telephone.Read 7 Oct 2026 · grc.com
Headquarters
Laguna Hills, California, USARead 28 Sep 2026 · grc.com
Maker
Gibson Research Corporation is owned and operated by Steve Gibson, and the page identifies Laguna Hills, California, USA.Read 7 Oct 2026 · grc.com
Access statistics
The final report summarizes read and write access-time statistics, including minimum, maximum, average, median, and variance.Read 7 Oct 2026 · grc.com
Cache handling
ValiDrive detects internal RAM caching and adjusts the transfer size needed to bypass it when necessary.Read 7 Oct 2026 · grc.com
Drive map
Each tested location is classified as validated, read error, write error, or no storage.Read 7 Oct 2026 · grc.com
Internet check
When it runs, ValiDrive briefly checks for updates through an anonymous DNS query; it does not automatically update itself.Read 7 Oct 2026 · grc.com
Preserves data
At each tested region, ValiDrive reads the original contents and rewrites them after its test, restoring whatever data was originally there.Read 7 Oct 2026 · grc.com
Release history
The listed releases are v1.0.0 from October 6, 2023 and v1.0.1 from October 8, 2023.Read 7 Oct 2026 · grc.com
Storage verification
It tests 576 evenly spaced locations using random data to verify that data can be stored and retrieved.Read 7 Oct 2026 · grc.com
Testing limit
The maker describes ValiDrive as a quick, cursory spot-check rather than a comprehensive deep test of storage media.Read 7 Oct 2026 · grc.com
Windows support
The FAQ describes running ValiDrive on Windows, including Windows 11 ARM under Parallels with Safe Emulation enabled.Read 7 Oct 2026 · grc.com

Plans and prices

ValiDrive Free Quick, cursory spot-check of 576 drive locations Read 7 Oct 2026 · grc.com

Every ValiDrive plan and price →

Strong points and limits

Strong points

  • Tests 576 evenly spaced drive locations
  • Restores original contents after each test
  • Detects and bypasses internal RAM caching
  • Drive map identifies four result categories
  • Reports detailed read and write timing statistics

Limits

  • Designed as a cursory spot-check, not a deep test
  • Available on Windows only
  • Briefly performs an anonymous DNS update check

Who it suits

ValiDrive suits Windows users who need a quick check for missing capacity on USB mass storage drives. It is less suited to anyone seeking a comprehensive deep test.

Verdict

ValiDrive provides a focused, free capacity spot-check with data restoration and clear location results. Its stated scope is deliberately limited, so it should be read as an initial check rather than full media verification.

Where Specifiction places it

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