New-AzureRmVM : Long running operation failed with status 'Failed'. Additional Info:'Blob https://uploadstorageaccount.blob.core.windows.net/vhds/productsv-OsDisk.vhd is already in use by another disk belonging to VM 'productSV'. You can examine the blob metadata for the disk reference information.' ErrorCode: DiskBlobAlreadyInUseByAnotherDisk

１）エラー
PS C:\Users\Administrator>     New-AzureRmVM -ResourceGroupName $rgName -Location $location -VM $vm

New-AzureRmVM : Long running operation failed with status 'Failed'. Additional Info:'Blob https://uploadstorageaccount.blob.core.windows.net/vhds/productsv-OsDisk.vhd is already in use by another disk belonging to VM 'productSV'. You can examine the blob metadata for the disk reference information.'
ErrorCode: DiskBlobAlreadyInUseByAnotherDisk
ErrorMessage: Blob https://uploadstorageaccount.blob.core.windows.net/vhds/productsv-OsDisk.vhd is already in use by another disk belonging to VM 'PRODUCTSV'. You can examine the blob metadata for the disk reference information.
StartTime: 2018/02/10 9:27:21
EndTime: 2018/02/10 9:27:21
OperationID: 400477a6-xxxx-xxxx-xxxx-ab95cef71e92
Status: Failed
発生場所 行:1 文字:5
+     New-AzureRmVM -ResourceGroupName $rgName -Location $location -VM  ...
+     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : CloseError: (:) [New-AzureRmVM]、ComputeCloudException
    + FullyQualifiedErrorId : Microsoft.Azure.Commands.Compute.NewAzureVMCommand

２）原因と対応   
作業用のストレージアカウントに既に同盟のBlogがあるためのエラーです。対象のファイルを削除して再実行しする。

StorageAccountに既に同名のVHDディスクがあり、「https://uploadstorageaccount.blob.core.windows.net/vhds/productsv-OsDisk.vhd」を変更、または、再駆除してくださいということです。