Ah good call on the dmesg
It gave me the SCSI ID and that appears to be for Generic Storage Driver (SD Card Slot)
I guess proxmox wants to open check the media even when its empty.
Thanks!
create full clone of drive virtio0 (temp-vm:100/windows-7.qcow2)
Rounding up size to full physical extent 223.57 GiB
Logical volume "vm-100-disk-0" created.
/dev/sdf: open failed: No medium found
transferred 0.0 B of 223.6 GiB (0.00%)
transferred 2.2 GiB of 223.6 GiB (1.00%)
transferred...