Primary boot je nastaven na sdb, tedy na disk na kterem je ubuntu, ovsem stejne nabehne windows, ktery je na disku sba. Pokud rucne nabootuju y EFI(nejaka cisla) tedy z EFI sdb nabehne vise uvedena hlaska. Pak je tam moznost nabootovat ten disk bez efi ale to pak nabehne windows z disku sba.
ubuntu@ubuntu:~$ sudo fdisk -l
Disk /dev/sda: 1000.2 GB, 1000204886016 bytes
255 heads, 63 sectors/track, 121601 cylinders, total 1953525168 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes
Disk identifier: 0x92e706ea
Device Boot Start End Blocks Id System
/dev/sda1 * 2048 409602047 204800000 7 HPFS/NTFS/exFAT
/dev/sda2 409602048 1953519615 771958784 7 HPFS/NTFS/exFAT
Disk /dev/sdb: 500.1 GB, 500107862016 bytes
255 heads, 63 sectors/track, 60801 cylinders, total 976773168 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x76692ca8
Device Boot Start End Blocks Id System
/dev/sdb1 * 2048 78127047 39062500 83 Linux
/dev/sdb2 78127102 976768064 449320481+ f W95 Ext'd (LBA)
/dev/sdb5 274904343 976768064 350931861 7 HPFS/NTFS/exFAT
/dev/sdb6 78127104 271486478 96679687+ b W95 FAT32
/dev/sdb7 271486976 274903039 1708032 82 Linux swap / Solaris
Partition table entries are not in disk order
Disk /dev/sdc: 16.0 GB, 16047407104 bytes
255 heads, 63 sectors/track, 1950 cylinders, total 31342592 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x00000000
Device Boot Start End Blocks Id System
/dev/sdc1 * 2048 31342591 15670272 c W95 FAT32 (LBA)