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KDiskMark vs AJA System Test: catalog facts
KDiskMark	AJA System Test
Free Free and open source.	Free Offered as a free download from AJA's product page.
Linux	Windows, macOS
Simple interface over the fio benchmark engine Configurable block size, queues and threads	Results are given in video terms such as resolution and codec Shows whether a drive can sustain recording and playback
Linux only Relies on fio being installed	Narrow focus on storage speed for video work Product page gives few technical details
Downloadable app	Downloadable app
Open source	Closed source
License not stated	License not stated
No account needed	Not stated if an account is needed
Works offline	Works offline
Official website Full listing and sources Checked September 23, 2026	Official website Full listing and sources Checked October 1, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.