Hi Javi,
The Synchron Player database only does a VERY quick, rudimentary speed test to identify the drive as an SSD or slow, spinning HDD. This does not have any impact on your actual speeds - but it could be an indicator if a drive is inefficiently formatted or possibly connected via a slow port/cable.
But I don't think that's the case for you. Also, kindly note that so-called sequential read-speeds (= the max. speed you see on product sheets for drives) do not really matter for real-life sample streaming. What really counts is a drive's capability in terms of random read-speeds.
The relevant question: Do you have performance issues when playing your instrument?