990 PRO MZ-V9P4T0BW 4TB is an SSD type hard drive which can fit 4,000 GB of data. The form factor is M.2 and it connects the hard drive directly to the motherboard.
From Samsung
Samsung 990 PRO PCIe 4.0 NVMe M.2 SSD in Black (MZ-V9P4T0BW)
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