I have a i9 2019 iMac with 1 TB SSD. I get one day 1.9 MB/s write and 2.5 MB/s read and other day 1.7 MB/s write and 1.9 MB/s read. Sometimes it gets down to 1.6 MB/s write and 1.3 MB/s read. Sometimes it gets up to 2 MB/s write and 2.6 MB/s read. Why is it that I get these inconsistent results? Anybody with same experience?
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Inconsistent test results of Blackmagic disk speed test software
- Thread starter nkurtar
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Try AJA System Test
it is an alternative to blackmagic.
I had similar issues years ago with blackmagic, discovered AJA and have been using it exclusively since.
www.aja.com
also on the Mac App Store
apps.apple.com
This just gives you a secondary testing method and more data to determine if this is the blackmagic software a different issue.
it is an alternative to blackmagic.
I had similar issues years ago with blackmagic, discovered AJA and have been using it exclusively since.
AJA System Test: Accurately Test Your System performance and speed
Predict the capabilities of any drive system for recording and playing back of various resolutions and codecs
also on the Mac App Store
AJA System Test Lite
AJA System Test Lite is a great way to test a storage system with a real world speed test. Designed with digital video production and post production needs in mind, it emulates the writing and reading of video files to and from a hard disk and displays the results in a simple, easy to read...
apps.apple.com
This just gives you a secondary testing method and more data to determine if this is the blackmagic software a different issue.
I am curious about the numbers you're reporting. On my 2013 MBP, I get 870MB/x write and 1470 MB/s read. Perhaps you're not including zeros?
In any event, disk test performance can depend on what else is going on in your system, such as Spotlight indexing, background (or foreground) downloads from open web pages, and so on. You should get pretty consistent results, assuming nothing else is contending form disk activity.
In any event, disk test performance can depend on what else is going on in your system, such as Spotlight indexing, background (or foreground) downloads from open web pages, and so on. You should get pretty consistent results, assuming nothing else is contending form disk activity.
One more thing: Before upgrading my ram to 72 GB from 8 GB, I was getting consistent 1900 MB/s write and 2500 MB/s read. After upgrade inconsistency started.