Extra disks you can attach to the VM besides the boot disk. Used for storing application data, databases, files, backups, etc. like plugging in a D: drive / external hard drive.
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Types:
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Standard persistent disk → Cheaper, slower, for backups/logs.
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Balanced persistent disk → Good general-purpose choice.
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SSD persistent disk → Faster, more expensive, for high IOPS workloads.
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Local SSD → Physically attached to the VM host, super-fast but temporary (data lost if VM stops).
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