2016-03-11

Install Windows 10 without extra partitions

BIOS systems with MBR need only one NTFS partition to boot Windows.

UEFI systems need two. A FAT32 partition for EFI boot files and a NTFS partition for Windows.

First download latest Windows ISO and make a bootable USB drive from it. Then boot and press shift-F10 when the installer loads.


The instructions for UEFI system:

diskpart
sel dis 0
cle
con gpt
cre par efi size=100
for quick fs=fat32
ass letter=s
cre par pri
for quick
ass
exi
cd /d d:\sources
dism /apply-image /imagefile:install.esd /index:1 /compact /applydir:c:\
bcdboot c:\windows /s s: /f UEFI
exit
Then exit the installer and boot into your new two-partition Windows installation.

Smallest possible EFI partition size seems to be around 36 MB for FAT32 and 20 MB for FAT(16) to fit all the boot files (only 4.5 MB if files are trimmed to minimum).


The instructions for legacy BIOS system:

diskpart
sel dis 0
cle
cre par pri
act
for quick
ass
exi
cd /d d:\sources
dism /apply-image /imagefile:install.esd /index:1 /compact /applydir:c:\
bcdboot c:\windows /s c: /f BIOS
exit
Then exit the installer and boot into your new one-partition Windows installation.

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