BlackMagic disk speed test unreliable on ssd?

jomirrivera

macrumors 6502
Original poster
Mar 15, 2011
348
23
Hi

I just installed a sandisk ultra SATA II on my macbook pro, of course I used blackmagic disk speed test to see the performance but I'm just getting around 89MB/s write and 120MB/s reads speeds. In the other hand if I use disktester or quick bench 4 (used by anandtech), I get around 220 write and 260 reads!
I'm worried cause BlackMagic disk speed test app is the most popular and common used app. It is possible that the app does not work well with my ssd?

Please excuse my english

Thanks
 
Last edited:

Ifti

macrumors 68020
Dec 14, 2010
2,329
464
UK
Hmmm, Ive just installed my new SSD, just editing the video at the moment before it goes onto YouTube, but I also used DiskSpeedTest by Blackmagic.
My stock HDD was giving me around 100MB/s for both read and write.
Installed my SSD and ran another speed test using the same utility and got around 390MB/s for write and 480MB/s read.
I found it pretty reliable!
Bear in mind Im using a SATA 3 SSD.
 

klmaj

macrumors member
Jul 14, 2012
51
0
Here are mine with Xbench. I'm using an Intel 520 120GB SSD:



Please post yours up so we can compare thanks.
 

robvas

macrumors 68030
Mar 29, 2009
2,911
418
USA
One uses random data and one might use all 0's. Sandforce drives will compress the all 0's and inflate the #'s, which is also what those manufacturers use in their advertised benchmarks.