 Windows 8.1 and later Windows systems like Windows 10 also support automatic TRIM for PCI Express SSDs based on NVMe.For Windows 7, the KB2990941 update is required for this functionality and needs to be integrated into Windows Setup using DISM if Windows 7 has to be installed on the NVMe SSD.Windows 8/8.1 also support the SCSI unmap command for USB-attached SSDs or SATA-to-USB enclosures.