Cannot Delete VHD

Hello, I have a VHD file but I cannot delete it.

It is not attached on existing VM or cloud services.

Here are some results from Windows Azure PowerShell:

PS C:\> Get-AzureDisk
詳細資訊: 上午 12:10:36 - Begin Operation: Get-AzureDisk
詳細資訊: 上午 12:10:40 - Completed Operation: Get-AzureDisk


AffinityGroup        :
AttachedTo           : RoleName: ly2314gallery
                       DeploymentName: ly2314gallery
                       HostedServiceName: ly2314gallery
IsCorrupted          : False
Label                :
Location             : East Asia
DiskSizeInGB         : 30
MediaLink            : http://***.blob.core.windows.net/vhds/ly2314gallery-ly2314gallery-2012-11-15
                       .vhd
DiskName             : ly2314gallery-ly2314gallery-0-20121115032603
SourceImageName      : OpenLogic__OpenLogic-CentOS-62-20120531-en-us-30GB.vhd
OS                   : Linux
OperationDescription : Get-AzureDisk
OperationId          : 2eabb95b-9faa-7cad-aa98-e7773285c4ac
OperationStatus      : Succeeded

AffinityGroup        :
AttachedTo           : RoleName: ly2314vpn
                       DeploymentName: ly2314vpn
                       HostedServiceName: ly2314vpn
IsCorrupted          : False
Label                :
Location             : Japan West
DiskSizeInGB         : 30
MediaLink            : http://***.blob.core.windows.net/vhds/ly2314vpn-ly2314vpn-2014-03-07.vhd
DiskName             : ly2314vpn-ly2314vpn-0-201403070238320991
SourceImageName      : b39f27a8b8c64d52b05eac6a62ebad85__Ubuntu-12_04_3-LTS-amd64-server-20140130-en-us-30GB
OS                   : Linux
OperationDescription : Get-AzureDisk
OperationId          : 2eabb95b-9faa-7cad-aa98-e7773285c4ac
OperationStatus      : Succeeded



PS C:\> Remove-AzureDisk

Cmdlet Remove-AzureDisk 在命令管線位置 1
請提供下列參數的值:
(輸入 !? 可取得說明。)
DiskName: ly2314vpn-ly2314vpn-0-201403070238320991
詳細資訊: 上午 12:10:56 - Begin Operation: Remove-AzureDisk
Remove-AzureDisk : BadRequest: A disk with name ly2314vpn-ly2314vpn-0-201403070238320991 is currently in use by virtual
 machine ly2314vpn running within hosted service ly2314vpn, deployment ly2314vpn.
位於 線路:1 字元:1
+ Remove-AzureDisk+ ~~~~~~~~~~~~~~~~+ CategoryInfo          : CloseError: (:) [Remove-AzureDisk]，CloudException
    + FullyQualifiedErrorId : Microsoft.WindowsAzure.Commands.ServiceManagement.IaaS.RemoveAzureDiskCommand

詳細資訊: 上午 12:10:59 - Completed Operation: Remove-AzureDisk
PS C:\> Get-AzureVM

ServiceName                             Name                                    Status
-----------                             ----                                    ------
ly2314gallery                           ly2314gallery                           ReadyRole


PS C:\>