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22.25 gb, 552 mb but you must install easybcd and add windows bootloader to 1st partition. – Talaat Etman Jun 16 '23 at 18:23
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If UEFI which it should be, you need to make sure Windows is the default boot loader. Normally you can change that in UEFI settings (not UEFI boot menu). Or in Ubuntu with efibootmgr, except HP systems. https://askubuntu.com/questions/133533/how-to-remove-ubuntu-and-put-windows-back-on & https://askubuntu.com/questions/133533/how-to-remove-ubuntu-and-put-windows-back-on – oldfred Jun 16 '23 at 19:36
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I'd always boot the OS you want to delete & note what it is using & what maybe impacted rather than guess from what another OS sees of it. Also ensure the soon to be deleted OS is not involved in the booting, or you risk being locked out of all OSes on the box (particularly the case if the unwanted OS was installed later), if it is you use the tools of the wanted OS to take over boot ownership. – guiverc Jun 16 '23 at 22:58
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@TalaatEtman , what if I directly delete the 55gb partition without adding bootloader,can you pls tell the necessity of adding windows bootloader to it? – vignesh s Jun 17 '23 at 02:29
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@vigneshs Since GRUB does the booting, you will enter grub rescue if you don't add windows bootloader. – Arjun K Shibu Jun 17 '23 at 04:51