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articles/security/fundamentals/isolation-choices.md

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### Logical Isolation Between Compute and Storage
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As part of its fundamental design, Microsoft Azure separates VM-based computation from storage. This separation enables computation and storage to scale independently, making it easier to provide multi-tenancy and isolation.
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Therefore, Azure Storage runs on separate hardware with no network connectivity to Azure Compute except logically. [This](https://msenterprise.global.ssl.fastly.net/vnext/PDFs/A01_AzureSecurityWhitepaper20160415c.pdf) means that when a virtual disk is created, disk space is not allocated for its entire capacity. Instead, a table is created that maps addresses on the virtual disk to areas on the physical disk and that table is initially empty. **The first time a customer writes data on the virtual disk, space on the physical disk is allocated, and a pointer to it is placed in the table.**
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Therefore, Azure Storage runs on separate hardware with no network connectivity to Azure Compute except logically. This means that when a virtual disk is created, disk space is not allocated for its entire capacity. Instead, a table is created that maps addresses on the virtual disk to areas on the physical disk and that table is initially empty. **The first time a customer writes data on the virtual disk, space on the physical disk is allocated, and a pointer to it is placed in the table.**
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### Isolation Using Storage Access control
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**Access Control in Azure Storage** has a simple access control model. Each Azure subscription can create one or more Storage Accounts. Each Storage Account has a single secret key that is used to control access to all data in that Storage Account.
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## Next Steps
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- [Network Isolation Options for Machines in Windows Azure Virtual Networks](https://azure.microsoft.com/blog/network-isolation-options-for-machines-in-windows-azure-virtual-networks/)
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- Learn about [Network Isolation Options for Machines in Windows Azure Virtual Networks](https://azure.microsoft.com/blog/network-isolation-options-for-machines-in-windows-azure-virtual-networks/). This includes the classic front-end and back-end scenario where machines in a particular back-end network or subnetwork may only allow certain clients or other computers to connect to a particular endpoint based on an allow list of IP addresses.
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This includes the classic front-end and back-end scenario where machines in a particular back-end network or subnetwork may only allow certain clients or other computers to connect to a particular endpoint based on an allow list of IP addresses.
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- [Compute Isolation](https://msenterprise.global.ssl.fastly.net/vnext/PDFs/A01_AzureSecurityWhitepaper20160415c.pdf)
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Microsoft Azure provides a various cloud-based computing services that include a wide selection of compute instances & services that can scale up and down automatically to meet the needs of your application or enterprise.
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- [Storage Isolation](https://msenterprise.global.ssl.fastly.net/vnext/PDFs/A01_AzureSecurityWhitepaper20160415c.pdf)
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Microsoft Azure separates customer VM-based computation from storage. This
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separation enables computation and storage to scale independently, making it easier to provide multi-tenancy and
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isolation. Therefore, Azure Storage runs on separate hardware with no network connectivity to Azure Compute
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except logically. All requests run over HTTP or HTTPS based on customer’s choice.
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- Learn about [virtual machine isolation in Azure](../../virtual-machines/windows/isolation.md). Azure Compute offers virtual machine sizes that are isolated to a specific hardware type and dedicated to a single customer.

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