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Cost Management
A Microsoft offering that enables tracking of cloud usage and expenditures for Azure and other cloud providers.
Hi! Looking at the naming convention, perhaps you created the same VM a few times without putting a check on "Delete with VM" for the Disk resources, and probably because of that you deleted the VM resource itself but not the disks associated with it.
To answer your question, yes, disk resources come with costs on your subscription, and you can delete them. To be extra sure you are not deleting any important data from your data disks you can check the contents easily by attaching them to a VM. The OS disks you can delete directly if you are not using them for any VM.