SCSI2SDv5.0a issue getting 2nd partition parameters

[Oldsmobile_Mike]

You might want to go back and verify the obvious stuff:  3.9 or 3.1 with  the necessary patches to use larger than 4GB disks, latest version of HDToolbox, etc.

[Oldsmobile_Mike]

ya I think I'll just format the whole 8GB SD card as one partition

I wouldn't do that, personally. Make a small partition (<500 MB) for SYS:, that way you'll maintain compatibility with any older software that tries to write to it. Then maybe a little bit bigger partition, call it WORK:, or whatever, since many Amiga programs expect that. I'd also create a separate partition to keep your games, and maybe one for backing up stuff, as well.

I use PFS, personally. Others swear by SFS. Good luck!

Edit: disregard that first paragraph if you're not using this as your primary drive.

[Oldsmobile_Mike]

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.

Can you post a screenshot of your HDToolbox?  Typically one hard disk = one device ID, unless it's something like a multi-slot card reader (in which case it would still be one ID, but use LUN's to differentiate the different physical card slots in the single device).