Shared disks on Azure Disk Storage are now generally available on all Premium SSD and Standard SSD sizes

Shared disks can now be leveraged on smaller Premium SSDs from 4GiB to 128 GiB and all Standard SSDs from 4 GiB to 32 TiB. This expands shared disk support to Ultra Disk, Premium SSD, and Standard SSD enabling you to optimize for different price and performance options based on your workload needs.
Source: Microsoft Azure – aggiornamenti