Symptoms
An application that uses the Virtual Device Interface feature of Microsoft SQL Server 2000 to back up a SQL Server 2000 database may not back up the database. When the backup operation fails, you experience the followingexception:
HRESULT 0×80070005 Additionally, an error message that is similar to the following error message is logged in the VDI.log file:

Date Time pid(3260) tid(4004)
Error on VIRTUALDEVICE_master
Error at CVDS::Create: Create Memory Status Code: 5, x5
Explanation: Access is denied. You typically experience this issue when multiple instances of the application that uses the Virtual Device Interface feature try to connect at the same time to different instances of SQL Server to initiate backups.
Resolution
This issue occurs because the instances of the application that uses the Virtual Device Interface feature pass the same virtual device name to the IClientVirtualDeviceSet2::CreateEx function at the same time. SQL Server uses that virtual device name as the memory-mapped file name when SQL Server sets up shared memory for backup. This naming conflict causes the backup to fail.