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You were so close, that knowledge arrives on the 16th minute of looking. https://xpenology.com/forum/topic/9392-general-faq/?tab=comments#comment-95507

Ok, problem solved i just need to add "rotation_rate=1" option at the end of this args part: "-device ide-hd,bus=ahci1.0,drive=drive-sata6,id=sata6,rotation_rate=1"

This works for me sata3: /dev/disk/by-id/ata-INTEL_SSDSC2BW220H6_CVTR42855BUV220CGP-part3,backup=0,cache=none,discard=on,size=105622104K,ssd=1

My solution #SATA port has limit in Proxmox to 6 disks (0-5), so added two disks with args and new ahc1 bus as sata6 ans sata7 drives #sata6%3A local%3A108/vm-108-disk-1.raw,size=10G #sata7%3A /dev/vg0/vg0_backup,backup=0 args: -device nec-usb-xhci,id=usb,multifunction=on,bus=pci.0,addr=0xa -drive file=/var/lib/vz/images/108/vm-108-disk-0.raw,format=raw,if=none,id=drive-usb-disk2 -device usb-storage,bus=usb.0,port=2,drive=drive-usb-disk2,id=usb-disk2,bootindex=1,removable=off -rtc base=utc,driftfix=slew -global kvm-pit.lost_tick_policy=delay -no-hpet -global PIIX4_PM.disable_s3=1 -global PIIX4_PM.disable_s4=1 -realtime mlock=off -machine pc-i440fx-2.9,accel=kvm,usb=off,vmport=off,dump-guest-core=off -device 'ahci,id=ahci1,multifunction=on,bus=pci.0,addr=0x8' -drive 'file=/var/lib/vz/images/108/vm-108-disk-1.raw,if=none,id=drive-sata6,format=raw,cache=none,aio=native,detect-zeroes=on' -device 'ide-hd,bus=ahci1.0,drive=drive-sata6,id=sata6' -drive 'file=/dev/vg0/vg0_backup,if=none,id=drive-sata7,format=raw,cache=none,aio=native,detect-zeroes=on' -device 'ide-hd,bus=ahci1.1,drive=drive-sata7,id=sata7'

Ok for me I followed the same method of stasheck and it works except for a few small changes except that I indicate below: I followed this tutorial here Configuring my machine: Proxmox version: 6.0-7 Proxmox hardware: Pentium g3220, Proxmox on an SSD, single SATA HDD. Loader used: Jun's loader 1.03b DSM software used: DSM_DS3615xs_24922.pat VM : CPU = KVM64 BIOS = SeaBIOS MACHINE = Q35 SCSIHW = MegaSAS NETWORK = e1000e Thank you stasheck If it helps.

All right, here's a tutorial for what worked for me. Proxmox version: 6.0-7 Proxmox hardware: Celeron J1900, Proxmox on an SSD, single SATA HDD (WDC). Loader used: Jun's loader 1.03b DSM software used: DSM_DS3615xs_24922.pat First, patch Proxmox so it allows for e1000e network card selection: # make backup cp /usr/share/pve-manager/pvemanagerlib.js /usr/share/pve-manager/pvemanagerlib.js.dist # add e1000e sed -i 's/|e1000|/|e1000|e1000e|/' /usr/share/pve-manager/pvemanagerlib.js sed -i "/\['e1000', 'Intel E1000'\],/a \ ['e1000e', 'Intel e1000e']," /usr/share/pve-manager/pvemanagerlib.js # backup updated script cp /usr/share/pve-manager/pvemanagerlib.js /usr/share/pve-manager/pvemanagerlib.js.e1000e # make backup cp /usr/share/perl5/PVE/QemuServer.pm /usr/share/perl5/PVE/QemuServer.pm.dist # add e1000e sed -i "s/'e1000', 'pcnet'/'e1000', 'e1000e', 'pcnet'/" /usr/share/perl5/PVE/QemuServer.pm # backup updated script cp /usr/share/perl5/PVE/QemuServer.pm /usr/share/perl5/PVE/QemuServer.pm.e1000e # make changes take effect service pveproxy restart service pvedaemon restart Then create new VM <vmid>, important settings are: CPU = KVM64 BIOS = SeaBIOS MACHINE = Q35 SCSIHW = MegaSAS NETWORK = e1000e I admit I have not tested all possible combinations, but I know I had to set the above to get successful boot. Next, copy loader to /var/lib/vz/images/<vmid>/synoboot.img My <vmid.conf> file looks like this (it's passing entire drive, but not controller): args: -device 'nec-usb-xhci,id=usb-ctl-synoboot,addr=0x18' -drive 'id=usb-drv-synoboot,file=/var/lib/vz/images/105/synoboot.img,if=none,format=raw' -device 'usb-storage,id=usb-stor-synoboot,bootindex=1,removable=off,drive=usb-drv-synoboot' balloon: 0 bios: seabios boot: c bootdisk: sata0 cores: 2 cpu: kvm64 machine: q35 memory: 4096 name: <cut> net0: e1000e=<cut>,bridge=vmbr0 numa: 0 onboot: 1 ostype: l26 sata0: /dev/disk/by-id/ata-WDC_WD20EFRX-<cut>,size=1953514584K scsihw: megasas serial0: socket smbios1: <cut> sockets: 1 startup: order=5 vmgenid: <cut> I know that there are reason not to use args:, but for me this resulted in booting from USB and the boot drive is not visible in Synology Manager, so I will not be changing that. I also used nec-usb-xhci so I can try to use USB3.0 passthrough, but that's something to try later. After booting (I used 3rd boot option, VMWare) I opened the Synology installer website and used the newest possible software to install - everything went smoothly. Hope this helps someone down the line