Amazon EBS reduces the minimum volume size of Throughput Optimized HDD and Cold HDD Volumes by 75%

December 11th, 2020 – You can now create Throughput Optimized HDD (ST1) and Cold HDD Volumes (SC1) as small as 125GB, allowing you to save up to 75% over the previous 500GB minimum when creating volumes at this new minimum size. 

Source:: Amazon AWS