You can add more than one virtual disk to a virtual machine.

You can store virtual disks as files in a datastore, which can be located on the local file system or a remote VMFS SAN datastore. You can store an IDE virtual disk or a SCSI virtual disk on either an IDE physical hard disk or on a SCSI physical hard disk.

You can add a SCSI virtual disk to a powered-on virtual machine with hardware versions earlier than 7.0. For earlier virtual machine hardware versions, you can add a SCSI virtual disk when the virtual machine is powered on only if a SCSI controller with an available slot already exists. SCSI controllers are created when you add a SCSI virtual disk or a passthrough SCSI device to the virtual machine. For virtual machines with hardware versions earlier than 7.0, you cannot create SCSI controllers when the virtual machine is powered on.

You cannot add an IDE virtual disk when the virtual machine is powered on.

Note

If you have a Windows NT 4.0 guest with a SCSI virtual disk, you cannot add an additional SCSI disk and an IDE disk to the configuration.