AIDA64 Random Access Time
Version and / or Patch Used: 1.60
Developer Homepage: http://www.aida64.com
Product Homepage: http://www.aida64.com
AIDA64 offers several different benchmarks for testing and optimizing your system or network. The Random Access test is one of very few if not only that will measure hard drives random access times in hundredths of milliseconds as oppose to tens of milliseconds.
Drives with only one or two tests displayed in the write test mean that they have failed the test and their Maximum and possibly their Average Scores were very high after the cache fills. This usually happens only with controllers manufactured by JMicron and Toshiba.
We hear a lot from manufacturers about the high sequential reads and write performance, but very little about latency. Latency is what makes a SSD feel fast in our computers, especially read latency. This is the time it takes for your request to be turned into an action. When you double click Internet Explorer you want your web page to open instantly. When you feel a delay, you feel increased access time.
As you can see in the charts most SSDs hover around the sub .1ms, but a few fall into the .05ms range.
Write access time isn't as big of a deal for consumer SSDs since under normal use you read more than you write data. However, if your write latency gets too high, your drive will pause for seemingly no apparent reason. We haven't had that problem with SSDs in a while, but a write event with high latency can slow down the read actions that are stacked in a string.