grub doesn't see disk with Windows on it

I have successfully installed manjaro alongside Windows 10. Each system has its own separate SSD. However there seems to be one problem: my grub can only see disk hd0 (the one with manjaro on). It doesn't list hd1 when using 'ls' command. And because of this it is unable to boot my Windows (it says "no such device, disk 'hd1,gpt1' not found.").

I've found out that once I exit grub with 'exit' command grub starts again and after this it is able to detect hd1 and boot Windows properly. What is more, instead of having to exit grub with command you can turn the bios on, exit it without doing anything and then grub will see the hd1 properly.

However these solutions don't satisfy me, I would love grub working without any problems and necessity to carry out these tricks.

Have you tried

sudo update-grub


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If an update to grub doesn't resolve the issue, please post the terminal output of the following commands for those forum members who are capable of helping you out to have some info about your set-up:

sudo parted -l
sudo blkid
efibootmgr -v

I have already updated grub and turned off Windows fast start-up. Unfortunately it didn't help.

When you executed the command I gave you, what is the output? Please, post it.

Model: ATA CT240BX300SSD1 (scsi)
Disk /dev/sda: 240GB
Sector size (logical/physical): 512B/4096B
Partition Table: gpt
Disk Flags: 

Number  Start   End    Size   File system  Name  Flags
 1      2097kB  317MB  315MB  fat32              boot, esp
 2      317MB   240GB  240GB  ext4

Model: ATA HFS256G39TND-N21 (scsi)
Disk /dev/sdb: 256GB
Sector size (logical/physical): 512B/4096B
Partition Table: gpt
Disk Flags: 

Number  Start   End    Size    File system  Name                          Flags
 1      1049kB  274MB  273MB   fat32        EFI system partition          boot, esp
 2      274MB   290MB  16,8MB               Microsoft reserved partition  msftres
 3      290MB   255GB  255GB   ntfs         Basic data partition          msftdata
 4      255GB   256GB  839MB   ntfs         Basic data partition          hidden, diag

sudo blkid:
/dev/sda1: UUID="3BF7-AD93" TYPE="vfat" PARTUUID="990907b3-ab68-41b3-a8c3-2c71151d98ae"
/dev/sda2: UUID="2a0a7f45-fd5b-49a6-a5f6-69dfa19f465d" TYPE="ext4" PARTUUID="59e2e670-7a98-45bc-a642-ee91cb19141c"
/dev/sdb1: LABEL="SYSTEM" UUID="04C7-7CA6" TYPE="vfat" PARTLABEL="EFI system partition" PARTUUID="9b5bf78b-487a-4094-b70c-13aa965ae869"
/dev/sdb2: PARTLABEL="Microsoft reserved partition" PARTUUID="10baca60-9b9e-4876-bab6-14e55522a5f1"
/dev/sdb3: LABEL="OS" UUID="B694CB0494CAC5D9" TYPE="ntfs" PARTLABEL="Basic data partition" PARTUUID="ce18b2de-6f7f-47f4-8fc2-72f6f525c1b8"
/dev/sdb4: LABEL="RECOVERY" UUID="E86E8DA76E8D6EDE" TYPE="ntfs" PARTLABEL="Basic data partition" PARTUUID="b2484eba-87fa-47b6-9719-63dcf7430c75"

efibotmgr -v
BootCurrent: 0001
Timeout: 1 seconds
BootOrder: 0001,0000,0005
Boot0000* Windows Boot Manager	HD(1,GPT,9b5bf78b-487a-4094-b70c-13aa965ae869,0x800,0x82000)/File(\EFI\MICROSOFT\BOOT\BOOTMGFW.EFI)WINDOWS.........x...B.C.D.O.B.J.E.C.T.=.{.9.d.e.a.8.6.2.c.-.5.c.d.d.-.4.e.7.0.-.a.c.c.1.-.f.3.2.b.3.4.4.d.}....................
Boot0001* Manjaro	HD(1,GPT,990907b3-ab68-41b3-a8c3-2c71151d98ae,0x1000,0x96000)/File(\EFI\MANJARO\GRUBX64.EFI)
Boot0005* UEFI OS	HD(1,GPT,990907b3-ab68-41b3-a8c3-2c71151d98ae,0x1000,0x96000)/File(\EFI\BOOT\BOOTX64.EFI)..BO
sudo update-grub
Generating grub configuration file ...
Found theme: /usr/share/grub/themes/manjaro/theme.txt
Found linux image: /boot/vmlinuz-5.3-x86_64
Found initrd image: /boot/intel-ucode.img /boot/initramfs-5.3-x86_64.img
Found initrd fallback image: /boot/initramfs-5.3-x86_64-fallback.img
Found Windows Boot Manager on /dev/sdb1@/efi/Microsoft/Boot/bootmgfw.efi
Found memtest86+ image: /boot/memtest86+/memtest.bin

This looks like the Windows boot entry in grub. Please, reboot and see if you can boot Windows using this entry.

Doesn't work. grub cannot find hd1 unless I restart grub.

OK, then please post your /etc/fstab. It could be helpful to mount the other disk at boot time which could be done with an entry in the fstab.

(had to post picture as plain text is unreadable because of spaces)

Please, check if ntfs-3g is installed by

pacman -Qi ntfs-3g

Did you change the <options> of your /boot/efi entry to umask=0077 or was it that way after install?


At manjaro's terminal, print out

pacman -Q grub
grep TIME /etc/default/grub
ls /etc/grub.d
grub-editenv list


It says it is installed. I did not change any options, so umask=0077 must have been like this after install.

Edit your /etc/default/grub





After saving the file enter the command:

sudo update-grub

and reboot

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I can see no difference in grub's behaviour. Again 'no such device, disk 'hd1,gpt1' not found'.

pacman -Q grub
grub 2.04-8

grep TIME /etc/default/grub

ls /etc/grub.d
00_header  20_linux_xen  40_custom  60_memtest86+
10_linux   30_os-prober  41_custom  README

grub-editenv list

sorry for that, complete newbie here

Have you disabled Fastboot in firmware?


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