Blizzard
The text of the Systems Specifications for Shadowlands was updated a few minutes ago on our Support Site:
https://us.battle.net/support/en/article/256565 2
The minimum requirements section for Storage now reads:
Solid State Drive (SSD)
100GB available space
Or
Hard Disk Drive (HDD)
100GB available space (depending on the performance of the drive, player experience may be impacted on HDD)