Azure – What are the “disk sizes” on Azure VMs

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So far, I was under the impression that

However, when looking at the Azure VM pricing page, I see that the instances include a column "disk size", e.g.

A0    1 core    0.75 GB RAM    20 GB Disk Size    EUR 11.29/mo
A1    1 core    1.75 GB RAM    40 GB Disk Size    EUR 25.10/mo
...

If Azure storage is billed on a per-use basis, what is the relevance of those "disk sizes"? Is it some "extra included" storage at no additional cost? Or is it a limit of how much storage you can add?

Best Answer

The disk size you see on this list is related to the temporary storage. For example, a D1 virtual machine comes with 50GB Temporary Storage (D:) volume.

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All Windows VMs comes with 127GB Local Disk (C:) and all Linux with 30GB. The Temp volume depends on the size of the VM, but not matter the size, you don't pay it.

What do you pay?

For Virtual Machines, you consume Page & Disk Blob Storage.

Standard Storage - You pay what you consume. In my example, I'm paying only about 12GB, which is the size of system and softwares in my C: volume.

Premium Storage (SSD) - You pay for the whole disk no matter if you are using only a portion of it.

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