![]() ![]() Similarly if Arch is installed in BIOS/MBR or BIOS/GPT mode in one disk and Windows is installed in UEFI/GPT in another disk, the BIOS bootloader used by Arch cannot chainload UEFI installed Windows in the other disk. ![]() That is, if Arch is installed in UEFI/GPT or UEFI/MBR mode in one disk and Windows is installed in BIOS/MBR mode in another disk, the UEFI bootloader used by Arch cannot chainload the BIOS installed Windows in the other disk. Most of the linux bootloaders installed for one firmware type cannot launch or chainload bootloaders of the other firmware type. See Unified Extensible Firmware Interface#UEFI firmware bitness for more information and available workarounds. Due to lack of Legacy BIOS support in these systems, and the lack of 32-bit UEFI boot in Arch Official Install ISO ( FS#53182), the official install media cannot boot on these systems. Intel Atom System-on-Chip Tablets (Clover trail and Bay Trail) provide only IA32 UEFI firmware without Legacy BIOS (CSM) support (unlike most of the x86_64 UEFI systems), due to Microsoft Connected Standby Guidelines for OEMs. either go for UEFI/GPT boot or BIOS/MBR boot. In case where Windows and Linux dual boot from the same disk, it is advisable to follow the method used by Windows, ie. The Windows limitation should be considered if the user wishes to boot Windows and Linux from the same disk, since installation procedure of boot loader depends on the firmware type and disk partitioning configuration. Such a limitation is not enforced by the Linux kernel, but can depend on which boot loader is used and/or how the boot loader is configured. Tip: Windows 10 version 1703 and newer supports converting from BIOS/MBR to UEFI/GPT using MBR2GPT.EXE. Thus Windows only supports either UEFI/GPT boot or BIOS/MBR configuration. This is a limitation enforced by Windows Setup, and as of April 2014 there is no officially (Microsoft) supported way of installing Windows in UEFI/MBR or BIOS/GPT configuration. ![]() If Windows is booted in Legacy BIOS mode, it can be installed only to an MBR disk. if Windows is booted in UEFI mode, it can be installed only to a GPT disk. In general, Windows forces type of partitioning depending on the firmware mode used, i.e. If the value is Legacy, Windows boots in BIOS/MBR mode. If the value is UEFI, Windows boots in UEFI/GPT mode.In the System Information windows, select System Summary on the left and check the value of BIOS mode item on the right.In the Run dialog type msinfo32.exe and press Enter.Press Win+R keys to start the Run dialog.The best way to detect the boot mode of Windows is to do the following : x86_64 Windows boot in x86_64 UEFI mode and 32-bit Windows boot in IA32 UEFI mode. Up to Windows 10, the firmware bitness matches the bitness of Windows, ie. ALL systems pre-installed with Windows 8/8.1, 10 and 11 boot in UEFI/GPT mode.Very few late systems pre-installed with Windows 7 are known to boot in x86_64 UEFI/GPT mode by default. MOST of the systems pre-installed with Windows 7 x86_64, irrespective of Service Pack level, bitness or edition (SKU), boot in BIOS/MBR mode by default.All systems pre-installed with Windows XP, Vista or 7 32-bit, irrespective of Service Pack level, bitness, edition (SKU) or presence of UEFI support in firmware, boot in BIOS/MBR mode by default.Windows 11 only supports x86_64 and a boot in UEFI mode from GPT disk.They do not support IA32 UEFI boot, x86_64 UEFI boot from MBR disk, or BIOS boot from GPT disk. Windows 8/8.1 and 10 x86_64 versions support booting in x86_64 UEFI mode from GPT disk only, OR in BIOS mode from MBR disk only.On market, the only systems known to ship with IA32 (U)EFI are some old Intel Macs (pre-2010 models?) and Intel Atom System-on-Chip (Clover trail and Bay Trail) Windows Tablets, which boot ONLY in IA32 UEFI mode and ONLY from GPT disk. They do not support x86_64 UEFI boot from GPT/MBR disk, x86_64 UEFI boot from MBR disk, or BIOS boot from GPT disk. Windows 8/8.1 and 10 x86 32-bit support booting in IA32 UEFI mode from GPT disk only, OR in BIOS mode from MBR disk only.A good example of this is Windows 11 which still works on a BIOS/MBR configuration once the Windows Setup check is bypassed. Note: The following points only list configurations supported by the Windows Setup even though Windows itself may still work on these unsupported configurations.
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