What is the difference between terraform Standard_LRS and StandardSSD_LRS? Terraform documentation points only, that you can chose one of those 2 but doesn't precise what is the difference. Is Standard_LRS an HHD disk? Or can it be SSD disk also?
Yes Irina you are guessing correct.
Microsoft now offers three types of storage for your Azure Virtual Machines and they include Standard HDD Storage, Standard SSD Storage, and Premium SSD Storage. Standard HDD Storage is based on the traditional hard disk model, Standard SSD and Premium SSD Storage are both based on Solid State Storage but offer different performance characteristics.
'Standard_HDD' disks will show 'Standard_LRS' in the StorageAccountType property, 'Standard SSD' will show 'StandardSSD_LRS', and a Premium SSD disk will show 'Premium_LRS' in that property.