On the other hand, your worst fragmented case still gets ~200MB&#x2F;s with a <i>random</i> read, which is around the <i>best</i> case with a <i>sequential</i> read for most HDDs today. A 4k random read on a HDD will be 1-2MB&#x2F;s at most.<p>Relatively speaking the SSD slows down to ~50% of its max speed with fragmentation, but the HDD will be down to around 1%. So fragmentation affects SSDs somewhat, but HDDs are affected much more severely.<p>(Which SSD was it, and how was the test setup? That&#x27;s important for comparison purposes, as the layout of the filesystem blocks and how they correspond to the NAND eraseblocks&#x2F;pages has a huge effect on what fragmentation will do.)