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How do I mark the unallocated space as bootable?

ubuntu@ubuntu:~$ 
ubuntu@ubuntu:~$ sudo fdisk -l | grep Disk
Disk /dev/loop0: 1.93 GiB, 2049204224 bytes, 4002352 sectors
Disk /dev/loop1: 27.9 MiB, 28405760 bytes, 55480 sectors
Disk /dev/loop2: 54.97 MiB, 57614336 bytes, 112528 sectors
Disk /dev/loop3: 240.82 MiB, 252493824 bytes, 493152 sectors
Disk /dev/loop4: 62.9 MiB, 65105920 bytes, 127160 sectors
Disk /dev/loop5: 49.8 MiB, 52203520 bytes, 101960 sectors
Disk /dev/sda: 2.75 TiB, 3000592982016 bytes, 5860533168 sectors
Disk model: ST3000DM001-9YN1
Disklabel type: dos
Disk identifier: 0x5771c34f
ubuntu@ubuntu:~$ 
ubuntu@ubuntu:~$ df -H
Filesystem      Size  Used Avail Use% Mounted on
udev            8.3G     0  8.3G   0% /dev
tmpfs           1.7G  1.6M  1.7G   1% /run
/dev/sr0        2.8G  2.8G     0 100% /cdrom
/dev/loop0      2.1G  2.1G     0 100% /rofs
/cow            8.4G  702M  7.7G   9% /
tmpfs           8.4G  126M  8.3G   2% /dev/shm
tmpfs           5.3M  8.2k  5.3M   1% /run/lock
tmpfs           8.4G     0  8.4G   0% /sys/fs/cgroup
tmpfs           8.4G  541k  8.4G   1% /tmp
tmpfs           1.7G   95k  1.7G   1% /run/user/999
/dev/loop1       29M   29M     0 100% /snap/snapd/7264
/dev/loop2       58M   58M     0 100% /snap/core18/1705
/dev/loop3      253M  253M     0 100% /snap/gnome-3-34-1804/24
/dev/loop4       66M   66M     0 100% /snap/gtk-common-themes/1506
/dev/loop5       53M   53M     0 100% /snap/snap-store/433
ubuntu@ubuntu:~$

gparted shows:

gparted

where I'm not seeing an option to change the flag...

This has to be change to EFI to dual-boot? Unfortunately, due to licensing, it's not an option to run Windows as VM with just an OEM license (for all practical purposes).

Thufir
  • 4,551

1 Answers1

2

You definetely need a GPT partition table on drives larger than 2.2TB. With the old msdos partition table you are limited to 2.2 TB and can't make use of the full amount of space.

Reference: https://uefi.org/sites/default/files/resources/UEFI_Drive_Partition_Limits_Fact_Sheet.pdf

If you install Windows on a GPT drive, it must be UEFI. Linux generally can be installed in either UEFI-mode or legacy-mode (the latter needs a bios_boot partition).

One more point: You can't mark unallocated space as bootable, unallocated space is not a partition.

mook765
  • 15,925