so set it up fine with the latest firmware update and setup 2 4GB partitions in the utility program, saved and all fine.
I just set up my 2 A2000 with that thingie, though I only use a 4 GB SD card, configured as *one* SCSI HD. Prepping and setup were flawless.
I'm not sure, but what youncall "partition" isn't an "partition", but a complete hard disk - for your Amiga! It doesn't know that those two 4 GB hard disks are indeed two parts on one physical SD card.
Are you sure you gave those "HD" each an own SCSI ID?
I must admit that I don't know how the usual Amiga SCSI controller work with *one* physical device at the connector that show up as *two* SCSI devices with *two* separate SCSI IDs. I always thought this kind of setup should work with *one* device ID and different LUNs.