Search for:

Available article translations:

How to know if my computer is using EFI/UEFI or BIOS firmware interface?

  • Parallels Desktop for Mac Business Edition
  • Parallels Desktop for Mac
  • Parallels Desktop for Mac Pro Edition
  • Parallels Desktop Lite


I am not able to migrate my Windows 8 or Windows 7 PC into a virtual machine using Parallels® Transporter™. Migration fails on detecting the operating system type.


Your PC most likely has a GPT partition on the hard drive and is using EFI/UEFI instead of BIOS.


Parallels Desktop supports migrating computers with GPT partitions and EFI/UEFI starting from version 10. Parallels Desktop 9 and earlier do not support migrating computers with GPT partitions and EFI/UEFI.

To determine whether your PC is using BIOS or EFI/UEFI please follow the steps below:

  1. Start your PC.
  2. Go to Start > Computer.

  3. Navigate to C:\Windows\Panther\setupact.log.

  4. Open setupact.log.
  5. Search for this string:

    Callback_BootEnvironmentDetect: Detected boot environment:

    It should tell you whther the boot environment is BIOS or UEFI:

    Code:Callback_BootEnvironmentDetect: Detected boot environment: BIOS
    Code:Callback_BootEnvironmentDetect: Detected boot environment: UEFI

In Windows 8 and Windows 8.1, if the setupact.log file is missing in the Panther folder, you can check the Boot Environment using the following steps:

  1. Press Win + R > type msinfo32 and press Enter.

  2. Look for the BIOS Mode entry.

  3. If the value listed is Legacy, then the Boot Environment is BIOS, otherwise the respective Boot Environment will be listed

Related articles:

Search words:

cannot migrate my PC to Mac

Transporter fails

unable to move PC to Mac

cannot transfer data to Mac


1e5db16426987d561060acdf56d947b4 33c4522b6fa9ca8e050f19b889fb58f1 969a7877819c0830af8bf12fb58c1eef 385adc52a567cad80fb2f95fb8c393bc f9b6a8d63f3437e0dca35c9704a9033c 4987860c21de5849bcebfeb0472cfd03

Was this article helpful?
Tell us how we may improve it.
Yes No