I have said this before in the forums, so I edited it to reflect only your needs. Most drives install with the "original" install disk (ie this case IVS Trumpcard disk).
The loss of drive showing up is usually a tooltype issue. HDToolbox only reflects scsi_device.
Add to DEVS:
device handler
Add to HDToolbox "tool types"
scsi_device_name=IVS_SCSI.device
Here are the IVS device handler names:
IVS Trumpcard Classic IVS_SCSI.device
IVS Trumpcard Professional IVS_SCSIpro.device
Note: Capitals and quotes are important, as device handlers are case sensitive.