It disables disk write caching and auto-relocation during testing to ensure it is analyzing the actual physical media, not just a controller's buffer. Technical Quick Facts A SpinRite Walkthrough
. For users with UEFI-only machines (common after 2019), running SpinRite requires a workaround, such as using a virtual machine (VirtualBox) with raw disk access. Gibson Research Why You Still Need It spinrite v6.1