VM storage transaction price specification. There is a data access fees on local disk of Azure VM. For example, every single block access incurs a transaction. The default block size is 4 Megabytes, meaning uploading a 32Mb file will incur 8 Storage Transactions. Deleting the file will also incur 8 transactions, so will updating it, and any other time the file is touched. The transactions are charged at a cost of around $0.00036 USD per 10,000 transactions. So 32Mb file will cost $0.000000368 AUD. The only exception to Storage Transactions is when Premium Storage (persistent SSD storage) is used. That is, when you provision a P10, P20 or a P30 disk for your Virtual Machine those disks are exempt from Storage Transactions. https://github.com/miranda-zhang/cloud-computing-schema/blob/master/example/azure/vm.md#storage-transactions