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This multi-functional dual M.2 riser expansion card provides two independent NGFF slots to accommodate different types of M.2 SSDs. The B Key slot connects SATA M.2 SSD to regular SATA port, while the M Key NVMe slot outputs via SFF-8611 Oculink connector for external high-speed storage expansion. It supports all common size M.2 SSDs and maintains original transmission performance without speed attenuation. Designed as a PCIe expansion card for desktops, it effectively expands storage scalability and enables users to repurpose idle SATA/NVMe M.2 SSDs for internal storage or external high-speed disk arrays.