Updated 26 October 2026 · Published by Zoorik
Azure disk sizes are the fixed sizes Azure offers for three types of managed disk, the disks that Azure virtual machines (VMs) use. Each size has a short name, such as P10, E10 or S10.
The letter gives the disk type, and the number gives the size:
- P is Premium SSD (solid-state drive), from P1 to P80.
- E is Standard SSD, from E1 to E80.
- S is Standard HDD (hard disk drive), from S4 to S80.
Common Azure managed disk sizes
The same number means the same size in each type:
- P10, E10 and S10 are 128 GiB.
- P20, E20 and S20 are 512 GiB.
- P30, E30 and S30 are 1,024 GiB.
So the Azure P10 disk size is 128 GiB, and an Azure P30 disk is 1 TiB. A charge named “P10 LRS Disk” means a P10 with locally redundant storage (LRS).
An example: a 200 GiB disk
Microsoft’s own example is a 200 GiB Standard SSD. Azure charges it as the next size up, E15 at 256 GiB. You pay for 256 GiB, not 200.
Why it matters for your cloud cost
- P, E and S disks charge for the whole size, however much data they hold.
- Premium SSD v2 and Ultra Disk charge per GiB, in 1 GiB steps.
Azure disk cost optimization shows ways to reduce this cost.
Amoeba moves a VM’s data disks onto one pool sized to your data, then rightsizes it autonomously. On Azure, it uses Premium SSD v2 where the region and zone offer it, and Premium SSD otherwise.
The free assessment works out your own figure.
Read next: Azure disk cost optimization
Sources: Microsoft Learn, “Select a disk type for Azure IaaS VMs” (opens in a new tab); Microsoft Learn, “Understand Azure Disk Storage billing” (opens in a new tab).