This is a mechanical HDD drive with an 18 TB storage capacity. This model's rotation speed is 7200 rpm.
From Ecprof
SDPH51J018TMBAAD - HDD Ext 18TB G-Drive Pro Tb3
Western Digital
SanDisk Professional 18TB G-DRIVE PRO SPACE, Grey - SDPH51J-018T-MBAAD
Clove Technology
SanDisk G-DRIVE PRO External hard drive - 18 TB