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How to find out SSD speed?

E

eidma

Junior Member
I'm planning to buy a SSD. Now I have a WD Black 7200RPM. I'd like to know exactly how does the actual HDD speed compare to my future SSD, but I can't find any benchmarks that compare HDDs and SSDs (only HDDs vs other HDDs, and SSDs vs other SSDs).
Then I tried looking at spec sheets on the net. But most of the HDD speeds are given in Mb/s, while for SSDs they use IOPS. So, again, I couldn't compare because the unit of measurement differed.
How can I get an informed speed comparison, not just: "SSDs are way faster", but actual numbers, using the same unit of measurement (IOPS or Mb/s)?

Thanks.
 
If you know the I/O size, then converting from IOPS to MB/s is a simple multiplication.

The reason that HDDs are measured in MB/s, is mostly because people benchmark them with sequential transfers. The reason that they do that, is that HDDs, with their moving read/write head(s), really suck at random-access transfers (IOPS).

The reason that SSDs are measured in IOPS is basically the exact opposite. SSDs excel at random-access, and IOPS is a way of measuring that.

For comparison, a 7200RPM HDD may reach 120 IOPS. A budget SSD reaches something like 30,000. A "pro" SSD reaches 80,000-90,000.
 
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