Ephemeral OS disk
An OS disk stored on the VM’s local/cache storage — free of managed-disk cost, but wiped on deallocate.
An ephemeral OS disk lives on the VM’s local temp/cache storage instead of a managed disk. That means no managed-disk storage charge and lower latency, at the cost of durability: the disk is lost if the VM is deallocated, redeployed, or reimaged.
It fits stateless, quickly rebuilt VMs (scale-set nodes, stateless services). It does not change the compute price this explorer shows, but it is a common way to cut the disk portion of a VM’s total cost.
More Azure pricing terms
On-Demand (Pay-As-You-Go)Reserved VM Instance (RI)Savings Plan for ComputeAzure Hybrid Benefit (AHB)Spot Virtual MachinesSpot eviction & eviction policyDev/Test pricingARM region nameMeter & SKUVM series naming (D, E, F, B and s/a/p)Constrained-vCPU sizesB-series burstable & CPU creditsCobalt & Ampere (Arm on Azure)vCPUEffective hourly rateWindows vs Linux pricingMax saving %Best price regionNormalized pricing ($/vCPU, $/GB)