SATA Express (SATAe or Serial ATA Express) is a section within the SATA v3.2 specification that defines connectors for host and device connectors that support SATA and PCI Express (PCIe) protocols simultaneously.
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The new host connector supports up to two SATA ports or two PCIe lanes. A separate signal, driven by the drive, tells the host if the device is SATA or PCIe. This allows the motherboard to have a single connector to support a current SATA or PCIe drive.
At the logical interface level, SATAe supports the Advanced Host Controller Interface (AHCI), which enables a PCIe device to be compatible with SATA software environments. NVM Express (NVMe), which is architected for high-performance solid-state drives, can be used as the logical device interface for attached PCIe storage devices.