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

  • Parallels Desktop 10 for Mac
  • Parallels Desktop 9 for Mac
  • Parallels Desktop 8 for Mac


I am not able to migrate Windows 8 or Windows 7 PC into a virtual machine using Parallels Transporter. Migration fails on detecting the Operating System type.


Most probably your PC has GPT partition on the hard drive and is using EFI/UEFI instead of BIOS.


Parallels Desktop currently does 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 us the boot environment: BIOS or UEFI:

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

In Windows 8, Windows 8.1 if the setupact.log file missing in the Panther folder, we 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 entry is present as Legacy then its BIOS, otherwise the respective Boot Environment will be listed

Related articles:

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