Blackmagic disk speed test windows 10 how to#
Would anyone be able to tell me how to use these commands to test my USB 3.0 drives or Thunderbolt drives? ioMeter is the best open source benchmarker out there however they don't fully support OSX, just the worker engine binaries - so iometer itself would have to run on a separate machine. during regular multi application usage of the OS. iow - this is as fast as it gets and in no way indicative of how your drive performs when ~30-50% of its reads and writes are random - i.e. One more thing to add and I don't know if was already mentioned or not tl:dr - this is a sequential test only. Time dd if=/dev/zero bs=1024k of=tstfile count=1024 2>&1 grep sec awk ''Īaaah much more like it. …or you can just use a disk benchmarking tool like bonnie, which is available to be installed from MacPorts. I wonder, though, if I should be getting higher speeds. Yes, the WD My Book is a bit slower, but it has no fan, which is a big plus. It's much faster than the internal SSD in my 2011 iMac.
Using RAID0, I get around 450MB/s read and 360MB/s write speeds with every test I've tried. I bought a Factory Refurb LaCie Little Big Drive for $229 (), removed the drives and the fan, and replaced the drives with a pair of SSDs. That's not really very fast for Thunderbolt. Internal laptop hd (7200 rpm, sata): Write=42.99 Mb/sec, Read=38.09 Mb/secĮxternal G-Raid (esata): Write=134.76 Mb/sec, Read=192.32 Mb/secĮxternal Seagate hd (laptop drive, USB-2): Write=33.59 Mb/sec, Read=36.38 Mb/secĮxternal G-Raid (Firewire 800): Write=60.79 Mb/sec, Read=66.17 Mb/secĮncrypted sparsebundle image on external G-Raid above (esata): Write=68.66 Mb/sec, Read=81.33 Mb/sec Here's what I get using this method (and dividing by 1048576 to get Mb/sec): This one-liner will test the write speed, clear the cache, properly test the read speed, and then remove tstfile to reclaim disk space:ĭd if=/dev/zero bs=1024k of=tstfile count=1024 & purge & dd if=tstfile bs=1024k of=/dev/null count=1024 & rm tstfile The proper way to do the read test is to be to dd the tstfile created by the write benchmark into /dev/null (but only after clearing the RAM cache by using the 'purge' command). Using /dev/zero as dd's input and output file doesn't hit the disk at all and will return ridiculous speeds like 15-20 GB/sec. The read speed test is flawed as written.
Blackmagic disk speed test windows 10 mac os x#
Mac OS X Hints editor - Macworld senior contributor
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