Measure how fast your drives really are - and see whether they stay that way.
Magic Disk Benchmark runs a write and a read test on any drive connected to your Mac and shows the result as it happens: the speed of every second, not just a single number at the end.
Features:
• Write and Read, Side by Side
Each run is drawn as two curves on one shared scale, so you can see at a glance that a drive reads twice as fast as it writes - and where it slows down under sustained load.
• Every Drive
Internal SSDs, external HDDs, USB sticks, SD cards and network shares. Network shares are measured for writes only, where a read test would only report your file cache.
• Speed Over Time
The curve shows the whole run second by second, with the write phase, the preparing phase and the read phase marked separately, plus the minimum, maximum and variance of each phase.
• Trend Across Runs
Compare every comparable run on a drive in one chart and hover any point to see when it was measured and what it reached. A drive that is degrading shows up here long before it fails.
• This Drive's Records
Every result is measured against the fastest run that drive has ever recorded, so you know immediately whether something has changed.
• Benchmark Browser
Browse every run ever made, sorted by drive, date, speed or duration, and open any of them to see its full curve again.
• Made for Repeat Testing
Set the duration, the block size and how many times a test should repeat - from a single pass to a continuous stress test - per drive.
• Nothing Leaves Your Mac
No account, no tracking, no upload. Results are stored in a local database on your machine.
The app icon was designed by Hugo Santos. You can find more information about my app icons here:
https://sascha-simon.com/icons/
You can find more great apps on my homepage:
https://www.sascha-simon.com
If you enjoy using this app, please leave a positive review. Positive reviews help other users discover the app and are a source of inspiration for me to keep improving it.
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Important, EXCELLENT APP!
AFMayer
Using this app, I discovered that my USB extension cable was throttling my USB hub by a factor of nearly 10x! I IMMEDIATELY purchased the upgrade for $1.99, not only because it has useful features, but to reward the developer for excellent work.THANK YOU, Sascha! – Physicist, Alexander Mayer
Finally a program that simply Works!
LostBoy555
Nice to finally download a program that works out of the chute like it claims. Great app to benchmark HDD’s.
Simply well done
armando912
I wanted to compare external to internal drives. It’s easy to use and understand.
It would not be a bad idea to add a column header which identifies reading and writing results
Dave me
Without that indication it’s impossible to know which is which.
Developer Response
Thanks for the suggestion! Version 6.1.2 adds exactly this: turn on "Show Read and Write Labels" in the settings and each speed value is labelled.
Redesigned Pro shop window.
Version 7.1.1
The developer, Sascha Simon, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Collected
The developer does not collect any data from this app.
Privacy practices may vary, for example, based on the features you use or your age. Learn More
Accessibility
The developer indicated that this app doesn’t support certain accessibility features. Learn More about the accessibility features.
Information
Seller
Sascha Simon
Size
4.3 MB
Category
Utilities
Compatibility
Requires macOS 15.6 or later and a Mac with Apple M1 chip or later.
Mac Requires macOS 15.6 or later and a Mac with Apple M1 chip or later.
