Please add the info requested in https://retropie.org.uk/forum/topic/3/read-this-first to your post. What RetroPie version, image used, hard-disk, etc. ?

@mitu Actually, I meant their physical size, 😊 but their smaller storage size makes backups and upgrades more practical, too. That said, SDHC officially goes up to 32 GB, but there are much bigger "SDHC" cards out there, of which some are said to work in a Pi, so …

I'm using a 32 GB card for my Retropie system and an external ssd for the roms. For my backup, I plug both of them into my PC running Kubuntu Linux (the card via a usb adapter), mount the ssd into the roms directory of the sd, and then backup the whole directory structure like it exists on my Pi. Thus, I do not benefit from the sd card's smaller storage size, but I guess my method is fairly uncommon. 😉

@vahnxdean Is your desktop running Windows or Linux ? How is your HDD formatted (partition, filesystem) ?

took your advise, made just one partition. thanks a lot

programing pinn or noobs needed more work

(https://github.com/procount/pinn/wiki/How-to-Create-a-Multi-Boot-SD-card-out-of-2-existing-OSes-using-PINN)

Followed this fella on you tube who tells you how to boot from the sd card without a boot program, just rewriting a file, and the image is now working, now i'am enabling the unallocated space that's left in the drive to add more roms and media.

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thanks mitu !

@retox I wrote something about this a while ago.
New USB Drive boot method in latest FW

It's still in beta and is not developed by the RetroPie team. Raspian that is built on Debian is developed by the Raspberry Pi foundation.

Any bug's are to be reported to the Raspberry pi github