A 12TB (uncompressed) Q2078A LTO-8 tape weighs 285.8g Depth: 111mm Height: 45.7mm Width: 113mm
An SSD has better data density. For example Samsung 990 Pro 4TB M.2 NVMe SSD: DIMENSION (WxHxD) 80 x 22 x 2.3 mm with WEIGHT Max 9.0g Weight
Highest density would be raw NAND flash chips: ICs would be ideal.
Maybe 12 inch wafers would be feasible but likely lower data density because flash chips are densely stacked within an IC.
A 12TB (uncompressed) Q2078A LTO-8 tape weighs 285.8g Depth: 111mm Height: 45.7mm Width: 113mm
An SSD has better data density. For example Samsung 990 Pro 4TB M.2 NVMe SSD: DIMENSION (WxHxD) 80 x 22 x 2.3 mm with WEIGHT Max 9.0g Weight
Highest density would be raw NAND flash chips: ICs would be ideal.
Maybe 12 inch wafers would be feasible but likely lower data density because flash chips are densely stacked within an IC.