With the device management workflows, you can manage the devices that are connected to a virtual machine or to a datastore of a host.

Add CD-ROM
Adds a virtual CD-ROM to a virtual machine. If the virtual machine has no IDE controller, the workflow creates one.
Add disk
Adds a virtual disk to a virtual machine.
Change RAM
Changes the amount of RAM of a virtual machine.
Convert disks to thin provisioning
Converts thick-provisioned disks of virtual machines to thin-provisioned disks.
Convert independent disks
Converts all independent virtual machine disks to normal disks by removing the independent flag from the disks.
Disconnect all detachable devices from a running virtual machine
Disconnects floppy disks, CD-ROM drives, parallel ports, and serial ports from a running virtual machine.
Mount CD-ROM
Mounts the CD-ROM of a virtual machine. If the virtual machine has no IDE controller or CD-ROM drive, the workflow creates them.
Mount floppy disk drive
Mounts a floppy disk drive FLP file from the ESX datastore.