The new ruler form factor SSDs fit perfectly in 1U rack units, solving problems with wasted space in data centers. Thus, a 1U rack can now store up to 1,000 TB (1 petabyte). Intel promises 3D NAND and Optane SSD models with the new ruler form factor in the near future.
https://www.notebookcheck.net/Ruler-fom-factor-SSDs-announced-by-Intel.240796.0.html