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Mount error with persistence file - Printable Version

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Mount error with persistence file - avggeek - 11-02-2021

I'm having trouble getting an Ubuntu ISO to boot with a persistence file:

My Environment:
  • Ventoy version 1.0.55
  • Host OS: Windows 10 Pro (21H2)
  • 256 GB USB key - Partition 1 formatted as exFAT.
Expected Behavior:
  • The Ubuntu 21.10 ISO will allow me to retain files between reboots using the persistence behavior
Actual Behavior:
  • The Ubuntu 21.10 ISO stops on boot with an error stating "mounting /dev/disk/by-label/casper-rw on /cow failed: Input/output error"
[Image: tDq3Sjz.png]

Steps:
  • Create a folder called "persistence" under "ventoy" in the USB key.
  • Download the persistence releases file "Ventoy persistence backend image files 5.0" from https://github.com/ventoy/backend/releases
  • Expand the "persistence_ext4_1GB_casper-rw.dat.7z" from the release file.
  • Rename the folder/file to "ubuntu2110.dat"
  • Copy the renamed folder/file to the path [Drive Letter]:/ventoy/persistence/
  • Verify that your ventoy.json has the following content (which is verified valid json):
Code:
{
    "control": [
        { "VTOY_DEFAULT_MENU_MODE": "1" },
        { "VTOY_FILT_DOT_UNDERSCORE_FILE": "1" },     
        { "VTOY_TREE_VIEW_MENU_STYLE": "1" },
        { "VTOY_MAX_SEARCH_LEVEL": "max" },
        { "VTOY_FILE_FLT_ISO": "0" },
        { "VTOY_FILE_FLT_WIM": "0" },
        { "VTOY_FILE_FLT_EFI": "0" },
        { "VTOY_FILE_FLT_IMG": "0" },
        { "VTOY_FILE_FLT_VHD": "0" },
        { "VTOY_FILE_FLT_VTOY": "0" },
        { "VTOY_DEFAULT_KBD_LAYOUT": "QWERTY_USA" }       
    ],
    "theme": {
        "file": "/ventoy/theme/Tela/theme.txt",       
        "display_mode": "GUI",
        "gfxmode": "1920x1080",
        "ventoy_left": "0%",
        "ventoy_top": "0",
        "ventoy_color": "#f2f2f2",
        "fonts": [
            "/ventoy/theme/Tela/dejavu_32.pf2",
            "/ventoy/theme/Tela/dejavu_sans_12.pf2",
            "/ventoy/theme/Tela/dejavu_sans_14.pf2",
            "/ventoy/theme/Tela/dejavu_sans_16.pf2",
            "/ventoy/theme/Tela/dejavu_sans_24.pf2",
            "/ventoy/theme/Tela/dejavu_sans_48.pf2",
            "/ventoy/theme/Tela/terminus-12.pf2",
            "/ventoy/theme/Tela/terminus-14.pf2",
            "/ventoy/theme/Tela/terminus-16.pf2",
            "/ventoy/theme/Tela/terminus-18.pf2"
        ]
    },
    "menu_class": [       
        {
            "dir": "/Antivirus",
            "class": "antivirus"
        },
        {
            "key": "[UEFI]_Malwarebytes_Antimalware",
            "class": "malwarebytes"
        },
        {
            "key": "eset_sysrescue",
            "class": "eset"
        },
        {
            "key": "krd",
            "class": "krd"
        },
        {
            "dir": "/VHD",
            "class": "vhd"
        },
        {
            "key": "[UEFI]_MediCat_VHD_",
            "class": "win10vhd"
        },
        {
            "dir": "/Backup_and_Restore",
            "class": "backup"
        },
        {
            "key": "[UEFI]_Acronis_Cyber_Backup_",
            "class": "acronisbackup"
        },
        {
            "key": "[UEFI]_Acronis_True_Image_",
            "class": "acronistrueimage"
        },
        {
            "key": "AcronisBootablePEMedia",
            "class": "acronistrueimage"
        },
        {
            "key": "[UEFI]_AOMEI_Backupper_",
            "class": "aomeibackupper"
        },
        {
            "key": "[UEFI]_EaseUS_Data_Recovery_Wizard_",
            "class": "easeusdatarecovery"
        },
        {
            "key": "[UEFI]_EaseUS_Todo_Backup_",
            "class": "easeustodobackup"
        },
        {
            "key": "[UEFI]_Elcomsoft_System_Recovery_",
            "class": "elcomsoft"
        },
        {
            "key": "[UEFI]_Macrium_Reflect_",
            "class": "macriumreflect"
        },
        {
            "key": "[UEFI]_MiniTool_Power_Data_Recovery_",
            "class": "minitoolpowerdatarecovery"
        },
        {
            "key": "[UEFI]_MiniTool_ShadowMaker_Pro_Ultimate_",
            "class": "minitoolshadowmaker"
        },
        {
            "key": "[UEFI]_O&O_BlueCon_",
            "class": "O&O"
        },
        {
            "key": "[UEFI]_rescuezilla-",
            "class": "rescuezilla"
        },
        {
            "key": "[UEFI]_Symantec_Ghost_",
            "class": "ghost"
        },
        {
            "dir": "/Boot_an_Operating_System",
            "class": "systemrescue"
        },
        {
            "key": "[UEFI]_Active@_",
            "class": "active"
        },
        {
            "key": "[UEFI]_Mini_Windows_10",
            "class": "windows10"
        },
        {
            "key": "[UEFI]_SystemRescue_",
            "class": "systemrescue"
        },
        {
            "dir": "/Boot_Repair",
            "class": "bootrepair"
        },
        {
            "key": "[BIOS]_BootIt_Bare_Metal_",
            "class": "bootitbaremetal"
        },
        {
            "key": "[BIOS]_Boot-Repair-Disk_",
            "class": "bootrepairdisk"
        },
        {
            "key": "[UEFI]_EasyUEFI_Enterprise_",
            "class": "easyuefi"
        },
        {
            "key": "[UEFI]_rescatux-",
            "class": "rescatux"
        },
        {
            "key": "[UEFI]_super_grub2-",
            "class": "linux"
        },
        {
            "dir": "/Diagnostic_Tools",
            "class": "diagnostics"
        },
        {
            "key": "[BIOS]_HDAT2_",
            "class": "hdat2"
        },
        {
            "key": "[BIOS]_MemTest86+_",
            "class": "memtest86+"
        },
        {
            "key": "[BIOS]_Spinrite",
            "class": "spinrite"
        },
        {
            "key": "[BIOS]_Ultimate_Boot_CD_",
            "class": "ubcd"
        },
        {
            "key": "[UEFI]_MemTest86_",
            "class": "memtest86"
        },
        {
            "dir": "/Partition_Tools",
            "class": "partitions"
        },
        {
            "key": "[UEFI]_Acronis_Disk_Director_",
            "class": "acronisdiskdirector"
        },
        {
            "key": "[UEFI]_AOMEI_Partition_Assistant_",
            "class": "aomeipartitionassistant"
        },
        {
            "key": "[UEFI]_DiskGenius_",
            "class": "diskgenius"
        },
        {
            "key": "[UEFI]_EaseUS_Partition_Master_",
            "class": "easeuspartitionmaster"
        },
        {
            "key": "[UEFI]_MiniTool_Partition_Wizard_",
            "class": "minitoolpartitionwizard"
        },
        {
            "key": "[UEFI]_NIUBI_Partition_Editor_",
            "class": "niubi"
        },
        {
            "key": "[UEFI]_Paragon_Hard_Disk_Manager_",
            "class": "paragonharddiskmanager"
        },
        {
            "key": "[UEFI]_Parted_Magic_",
            "class": "partedmagic"
        },
        {
            "key": "[UEFI]_ShredOS-",
            "class": "shredos"
        },
        {
            "dir": "/Password_Removal",
            "class": "passwords"
        },
        {
            "key": "[UEFI]_Jayro's_Lockpick",
            "class": "lockpick"
        },      
        {
            "dir": "/OSimages",
            "class": "os"
        },
        {
            "dir": "/OSimages/Linux",
            "class": "linux"
        },
        {
            "dir": "/Windows_Recovery",
            "class": "recovery"
        },
        {
            "key": "[UEFI]_Windows_8",
            "class": "windows8"
        },
        {
            "key": "ubuntu",
            "class": "ubuntu"
        },
        {
            "key": "debian",
            "class": "debian"
        },
        {
            "key": "proxmox",
            "class": "proxmox"
        },
        {
            "key": "[UEFI]_Windows_10",
            "class": "windows10"
        }
    ],
    "menu_alias": [
        {
            "dir": "/OSimages/Linux",
            "alias": "Linux ISO"
        },
        {
            "image": "/OSimages/Linux/debian-11.1.0-amd64-DVD-1.iso",
            "alias": "Debian Bullseye"
        },
        {
            "image": "/OSimages/Linux/ubuntu-20.04.1-live-server-amd64.iso",
            "alias": "Ubuntu 20.04 LTS (Server)"
        },
        {
            "image": "/OSimages/Linux/proxmox-ve_7.0-2.iso",
            "alias": "Proxmox 7"
        },
        {
            "image": "/OSimages/Linux/debian-live-11.1.0-amd64-xfce.iso",
            "alias": "Debian Bullseye Desktop (XFCE)"
        },
        {
            "image": "/OSimages/Linux/ubuntu-20.04.1-desktop-amd64.iso",
            "alias": "Ubuntu 20.04 (Desktop)"
        },
        {
            "image": "/OSimages/Linux/debian-10.11.0-amd64-DVD-1.iso",
            "alias": "Debian Buster"
        },
        {
            "image": "/OSimages/Linux/proxmox-ve_6.3-1.iso",
            "alias": "Proxmox 6"
        },
        {
            "image": "/Boot_an_Operating_System/ubuntu-21.10-desktop-amd64.iso",
            "alias": "Ubuntu 21.10 (Desktop w. Persistence)"
        },
        {
            "image": "/Backup_and_Restore/AcronisBootablePEMedia.iso",
            "alias": "Acronis Rescue Media (WinPE)"
        },
        {
            "image": "/Antivirus/eset_sysrescue_live_enu.iso",
            "alias": "ESET SysRescue Live"
        },
        {
            "image": "/Antivirus/krd.iso",
            "alias": "Kaspersky Rescue Disk Free"
        },
        {
            "image": "/VHD/[UEFI]_MediCat_VHD_&DW.vhd",
            "alias": "MediCat VHD"
        },
        {
            "image": "/Antivirus/[UEFI]_Malwarebytes_Antimalware_v21.06.wim",
            "alias": "[UEFI] Malwarebytes Bootable"
        },
        {
            "image": "/Backup_and_Restore/[UEFI]_Acronis_Cyber_Backup_v12.5_Build_16428.iso",
            "alias": "[UEFI] Acronis Cyber Backup v12.5 Build 16428"
        },
        {
            "image": "/Backup_and_Restore/[UEFI]_Acronis_True_Image_v2021_Build_39216.iso",
            "alias": "[UEFI] Acronis True Image v2021 Build 39216"
        },
        {
            "image": "/Backup_and_Restore/[UEFI]_AOMEI_Backupper_v6.5.0.wim",
            "alias": "[UEFI] AOMEI Backupper v6.5.0"
        },
        {
            "image": "/Backup_and_Restore/[UEFI]_EaseUS_Data_Recovery_Wizard_v14.0.wim",
            "alias": "[UEFI] EaseUS Data Recovery Wizard v14.0"
        },
        {
            "image": "/Backup_and_Restore/[UEFI]_EaseUS_Todo_Backup_v13.5.0.wim",
            "alias": "[UEFI] EaseUS Todo Backup v13.5.0"
        },
        {
            "image": "/Backup_and_Restore/[UEFI]_Elcomsoft_System_Recovery_v7.2.628.iso",
            "alias": "[UEFI] Elcomsoft System Recovery v7.2.628"
        },
        {
            "image": "/Backup_and_Restore/[UEFI]_Macrium_Reflect_v8.0.5994.wim",
            "alias": "[UEFI] Macrium Reflect v8.0.5994"
        },
        {
            "image": "/Backup_and_Restore/[UEFI]_MiniTool_Power_Data_Recovery_v9.2.wim",
            "alias": "[UEFI] MiniTool Power Data Recovery v9.2"
        },
        {
            "image": "/Backup_and_Restore/[UEFI]_MiniTool_ShadowMaker_Pro_Ultimate_v3.6.wim",
            "alias": "[UEFI] MiniTool ShadowMaker v3.6"
        },
        {
            "image": "/Backup_and_Restore/[UEFI]_rescuezilla-2.2-64bit.iso",
            "alias": "[UEFI] Rescuezilla v2.2"
        },
        {
            "image": "/Backup_and_Restore/[UEFI]_Symantec_Ghost_x64_v12.0.0.11331.wim",
            "alias": "[UEFI] Symantec Ghost v12.0.0.11331"
        },
        {
            "image": "/Boot_an_Operating_System/[UEFI]_Active@_Data_Studio_v17.0.0.iso",
            "alias": "[UEFI] Active@ Data Studio v17.0.0"
        },
        {
            "image": "/Boot_an_Operating_System/[UEFI]_Mini_Windows_10.wim",
            "alias": "[UEFI] Mini Windows 10"
        },
        {
            "image": "/Boot_an_Operating_System/[UEFI]_O&O_BlueCon_v18.0.8088.wim",
            "alias": "[UEFI] O&O BlueCon v18.0.8088"
        },
        {
            "image": "/Boot_an_Operating_System/[UEFI]_systemrescue-8.03-x64.iso",
            "alias": "[UEFI] SystemRescue v8.03"
        },
        {
            "image": "/Boot_Repair/[BIOS]_Boot-Repair-Disk_v2020-6-13.iso",
            "alias": "[BIOS] Boot-Repair-Disk v2020.6.13"
        },
        {
            "image": "/Boot_Repair/[UEFI]_EasyUEFI_v4.6.2.wim",
            "alias": "[UEFI] EasyUEFI v4.6.2"
        },
        {
            "image": "/Boot_Repair/[UEFI]_rescatux-0.73.iso",
            "alias": "[UEFI] Rescatux v0.73"
        },
        {
            "image": "/Boot_Repair/[BIOS]_BootIt_Bare_Metal_v1.70.iso",
            "alias": "[BIOS] BootIt Bare Metal v1.70"
        },
        {
            "image": "/Boot_Repair/[UEFI]_super_grub2-2.04s2-beta2-x86_64_efi-.efi",
            "alias": "[UEFI] Super Grub2 Disk v2.04 S2 Beta 2 (EFI Version)"
        },
        {
            "image": "/Boot_Repair/[UEFI]_super_grub2-2.04s2-beta2-x86_64_efi-.iso",
            "alias": "[UEFI] Super Grub2 Disk v2.04 S2 Beta 2 (ISO Version)"
        },
        {
            "image": "/Diagnostic_Tools/[BIOS]_HDAT2_v7.2.iso",
            "alias": "[BIOS] HDAT2 v7.2"
        },
        {
            "image": "/Diagnostic_Tools/[BIOS]_MemTest86+_v5.31_Beta.iso",
            "alias": "[BIOS] MemTest86+ v5.31 Beta"
        },
        {
            "image": "/Diagnostic_Tools/[BIOS]_Spinrite.iso",
            "alias": "[BIOS] Spinrite v6.0"
        },
        {
            "image": "/Diagnostic_Tools/[BIOS]_Ultimate_Boot_CD_539.iso",
            "alias": "[BIOS] Ultimate Boot CD v5.3.9"
        },
        {
            "image": "/Diagnostic_Tools/[UEFI]_MemTest86_v9.0._ARM64.efi",
            "alias": "[UEFI] PassMark MemTest86 v9.0 [ARM64/AARCH64]"
        },
        {
            "image": "/Diagnostic_Tools/[UEFI]_MemTest86_v9.0.efi",
            "alias": "[UEFI] PassMark MemTest86 v9.0 [AMD64]"
        },
        {
            "image": "/Partition_Tools/[UEFI]_Acronis_Disk_Director_v12.5_Build_163.wim",
            "alias": "[UEFI] Acronis Disk Director v12.5"
        },
        {
            "image": "/Partition_Tools/[UEFI]_Active@_UNERASER_v16.0.2.wim",
            "alias": "[UEFI] Active@ UNERASER v16.0.2"
        },
        {
            "image": "/Partition_Tools/[UEFI]_AOMEI_Partition_Assistant_v9.2.1.wim",
            "alias": "[UEFI] AOMEI Partition Assistant v9.2.1"
        },
        {
            "image": "/Partition_Tools/[UEFI]_DiskGenius_5.4.2.2278.wim",
            "alias": "[UEFI] DiskGenius v5.4.2.2278"
        },
        {
            "image": "/Partition_Tools/[UEFI]_EaseUS_Partition_Master_15.8.wim",
            "alias": "[UEFI] EaseUS Partition Master 15.8"
        },
        {
            "image": "/Partition_Tools/[UEFI]_MiniTool_Partition_Wizard_12.3.wim",
            "alias": "[UEFI] MiniTool Partition Wizard v12.3"
        },
        {
            "image": "/Partition_Tools/[UEFI]_NIUBI_Partition_Editor_v7.4.1.wim",
            "alias": "[UEFI] NIUBI Partition Editor v7.4.1"
        },
        {
            "image": "/Partition_Tools/[UEFI]_Paragon_Hard_Disk_Manager_v17.13.1.wim",
            "alias": "[UEFI] Paragon Hard Disk Manager v17.13.1"
        },
        {
            "image": "/Partition_Tools/[UEFI]_Parted_Magic_2021_05_12_0.iso",
            "alias": "[UEFI] Parted Magic v2021.05.12"
        },
        {
            "image": "/Partition_Tools/[UEFI]_ShredOS-2020.05.img",
            "alias": "[UEFI] ShredOS (Pass: medicat)"
        },
        {
            "image": "/Password_Removal/[UEFI]_Jayro's_Lockpick.wim",
            "alias": "[UEFI] Jayro's Lockpick"
        },
        {
            "image": "/Windows_Recovery/[UEFI]_Windows_8_Recovery.wim",
            "alias": "[UEFI] Windows 8 Recovery +MS DaRT"
        },
        {
            "image": "/Windows_Recovery/[UEFI]_Windows_10_Recovery.wim",
            "alias": "[UEFI] Windows 10 Recovery +MS DaRT"
        },
        {
            "dir": "/Antivirus",
            "alias": "Antivirus -->"
        },
        {
            "dir": "/Backup_and_Restore",
            "alias": "Backup and Restore -->"
        },
        {
            "dir": "/Boot_an_Operating_System",
            "alias": "Boot an Operating System -->"
        },
        {
            "dir": "/Boot_Repair",
            "alias": "Boot Repair -->"
        },
        {
            "dir": "/Diagnostic_Tools",
            "alias": "Diagnostic Tools -->"
        },
        {
            "dir": "/OSimages",
            "alias": "Install OS -->"
        },
        {
            "dir": "/Partition_Tools",
            "alias": "Partition Tools -->"
        },
        {
            "dir": "/Password_Removal",
            "alias": "Password Removal -->"
        },
        {
            "dir": "/VHD",
            "alias": "VHDs -->"
        },
        {
            "dir": "/Windows_Recovery",
            "alias": "Windows Recovery -->"
        }
    ],
    "auto_memdisk": [
        "/Diagnostic_Tools/[BIOS]_HDAT2_7.2.iso",
        "/Diagnostic_Tools/[BIOS]_Spinrite.iso",
        "/Diagnostic_Tools/[BIOS]_MemTest86+_v5.31_Beta.iso"
    ],
    "persistence": [
        {
            "image": "/Boot_an_Operating_System/ubuntu-21.10-desktop-amd64.iso",
            "backend": [
                "/ventoy/persistence/ubuntu2110.dat/ubuntu2110.dat"
            ]
        }
    ],
    "auto_install": [
        {
            "image": "/OSimages/Linux/debian-11.1.0-amd64-DVD-1.iso",
            "template": [
                "/ventoy/templates/debian11-generic-preseed.cfg",
                "/ventoy/templates/debian11-test-preseed.cfg"
            ],
            "timeout": 10
        }
    ]
}
  • Verify that the persistence file on the USB key is indeed an ext4 file with the "casper-rw" label:
Code:
$ file /j/ventoy/persistence/ubuntu2110.dat/ubuntu2110.dat
/j/ventoy/persistence/ubuntu2110.dat/ubuntu2110.dat: Linux rev 1.0 ext4 filesystem data, UUID=62fcf2b5-ffff9ac2-4a00-ffff9bac-78e61bb05976, volume name "casper-rw" (extents) (64bit) (large files) (huge files)
  • Boot the ventoy USB key and select the ISO "/Boot_an_Operating_System/ubuntu-21.10-desktop-amd64.iso"
Following the instructions posted here (https://forums.ventoy.net/showthread.php?tid=51&pid=202#pid202), I ran vt_dump_persistence at the ventoy grub shell. Screenshot below:

[Image: BXsLoBg.png]

RE: Mount error with persistence file - longpanda - 11-02-2021

1. delete ubuntu2110.dat
2. recopy persistence_ext4_1GB_casper-rw.dat to the USB as the new ubuntu2110.dat
3. Boot into Ventoy's main menu
4. Don't boot the ubuntu.iso, but press c to enter grub shell and checksum the dat file as in the attached photo
(The persistence_ext4_1GB_casper-rw.dat  file MD5 is  6ced092c969eb7cfaf2f4808fdcf4dde)

RE: Mount error with persistence file - avggeek - 11-02-2021

I deleted the file on the USB key and re-copied persistence_ext4_1GB_casper-rw.dat as suggested. The md5 hash for the re-copied file seems identical to the string mentioned below - see screenshot:

[Image: o6jB0gA.png]
I tried swapping the persistence file to persistence_ext4_512MB_casper-rw.dat and modified the config as follows:

Code:
    "persistence": [
        {
            "image": "/Boot_an_Operating_System/ubuntu-21.10-desktop-amd64.iso",
            "backend": [
                "/ventoy/persistence/persistence_ext4_512MB_casper-rw.dat"
            ]
        }
    ]

Ubuntu ISO stops with the same error message. Is there some known incomptability with using persistence in Ventoy booted via VirtualBox?

RE: Mount error with persistence file - avggeek - 11-02-2021

It seems like it's an issue with using persistence files with Ventoy booted via VirtualBox.

I tried both ubuntu2110.dat (persistence_ext4_1GB_casper-rw.dat) and persistence_ext4_512MB_casper-rw.dat with Ventoy booted from a physical machine and the persistence files worked correctly. 

Might be worth mentioning in the plugin docs for folks who are using VirtualBox to test their Ventoy config.

RE: Mount error with persistence file - longpanda - 11-02-2021

How did you test in VirtualBox?
Did you add your physical USB drive as a virtualdisk to the VM? Or did you install Ventoy to a virtualdisk inside the VM?

RE: Mount error with persistence file - Steve2926 - 11-02-2021

When using VBox to directly boot from a USB drive, you should use VMUB.
VMUB unlocks the USB drive so that VBox can lock the drive and does not have to use snapshotting.
https://rmprepusb.com/tutorials/004-how-to-boot-directly-from-a-usb-drive-using-an-emulator-or-vm-under-windows/

VMUB only works with VBox 5 (not VBOX6)

VBOX5+VMUB + Ventoy USb drive with Ubuntu + persistence .dat file works OK for me.

RE: Mount error with persistence file - avggeek - 11-03-2021

(11-02-2021, 03:50 PM)Steve2926 Wrote: When using VBox to directly boot from a USB drive, you should use VMUB.
VMUB unlocks the USB drive so that VBox can lock the drive and does not have to use snapshotting.
https://rmprepusb.com/tutorials/004-how-to-boot-directly-from-a-usb-drive-using-an-emulator-or-vm-under-windows/

VMUB only works with VBox 5  (not VBOX6)

VBOX5+VMUB + Ventoy USb drive with Ubuntu + persistence .dat file works OK for me.

I'm on Windows 10 so VBOX5 is pretty much unsupported there. VBOX6 is the only thing that works (and just barely).

(11-02-2021, 02:13 PM)longpanda Wrote: How did you test in VirtualBox?
Did you add your physical USB drive as a virtualdisk to the VM?  Or did you install Ventoy to a virtualdisk inside the VM?

I'm adding my physical USB drive as a virtualdisk to the VM.

RE: Mount error with persistence file - longpanda - 11-03-2021

Can you use VMWare to do a comparison test?

RE: Mount error with persistence file - avggeek - 11-03-2021

(11-03-2021, 01:24 AM)longpanda Wrote: Can you use VMWare to do a comparison test?

With Workstation Pro, I'm able to successfully boot the Ubuntu ISO with persistence file ubuntu2110.dat (persistence_ext4_1GB_casper-rw.dat).

It is much harder to use Ventoy with VMWare though, as VMWare does not have a simple way to boot from physical USB. Steps I had to use are:
  • Change BIOS type to UEFI in VM Settings.
  • Right click on VM and choose "Power on to firmware"
  • Attach USB drive to VM using Removable Devices menu
  • Go to "Enter Setup", choose "Boot from a file"
  • Look for the "VTOYEFI" entry, then navigate to /EFI/BOOT directory
  • Select the BOOTX64.EFI file


RE: Mount error with persistence file - Steve2926 - 11-03-2021

I use Win10 with VBox 5 and VMUB all the time (about 10-50 times a day). It is the best way to boot from USB using VBox.