SanDisk Professional 4TB portable SSD, model SDPS31H-004T. The enclosure reports its internal WD_BLACK SN850XE 4TB NVMe drive to CrystalDiskInfo at 100% health, with 3,855 GB written, 12,275 GB read, 38 power-on hours, 54 power cycles, and zero media/data-integrity errors. The exact drive, model label, and full health report are pictured. Cable and original box are not included.