This article contains information on DeviceLock eSATA HDD devices control.
DeviceLock treats all external USB, FireWire and PCMCIA hard drives as the Removable type. Also, DeviceLock treats as Removable any internal hard drives if they support the hot plug feature (the "Safely Remove Hardware" feature is enabled for them) and Windows is not installed and running on them.
The same applies to eSATA devices, i.e. it is possible to control some of them with DeviceLock at Removable level. However, there is no control for eSATA at the interface level now and no future implementation plans as well.