My Windows is on my HDD and Manjaro is on my SSD. I failed to set a dual boot on grub as well as my bios. However after removing the SSD from the system my PC boots up Windows on my HDD. I have set my BIOS on CPM mode. I’m using a MSI motherboard. My HDD is dynamic, NTFS and simple [I can’t change it to basic however I try, it’s old that might be the reason] and I have installed Manjaro on UEFI mode GPT.
Bios in csm is the reason you cannot boot, most probably. Set it to uefi only, csm disabled and see if something changes, most notably if you can still boot windows from bios menu (you will be able ro boot manjaro). If it works there is a simple tutorial to stich it all together, but they have to be i 1 mode and not mixed.
Hi @Dipsana
Your post was not very clear, but if I understand it correctly I’m afraid you’ve made a fundamental mistake.
If Windows was installed as BIOS/MBR (or Legacy/CSM) then your Manjaro ISO/USB must also be booted and installed as BIOS/MBR.
A BIOS booting OS can not co-exist peacefully with a UEFI booting OS. As your Windows installation appears to be booting as BIOS/MBR, then the easiest thing to do is reinstall Manjaro as BIOS/MBR also.
1. Create a Manjaro Installer than boots in BIOS/MBR mode.
2. Disconnect the Windows HDD.
3. Boot the new Manjaro Installer USB.
4. Install gparted in the Live environment.
5. Create a new MBR (msdos) Partition Table on the SSD.
6. Reboot to the Manjaro Installer and Install Manjaro.
7. When Manjaro is installed and working (it boots as expected), shut down your machine and reconnect the Windows HDD.
8. Boot to BIOS and make sure the Manjaro SSD is in the first boot position.
9. Boot your machine.
Note: there are other considerations when multi-booting Windows and Linux; but this basic procedure should solve the immediate issue.
Good luck.
The OP has another thread indirectly related to the overall issue they are experiencing; could/should this be merged?
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Negative. As you say, it’s only indirectly related. 
Dear Teo,
I updated my BIOS settings to UEFI only but it didn’t work. Thank you for trying.
Regards,
Dipsana
Dear Dev,
Thank you soundofthunder for enlightening me. I have also thought of the same, they can’t co-exist. BIOS and grub are just straight ignoring windows until I plug my SSD SATA cable out.
I’m thinking of purchasing another SSD and install windows on it by UEFI mode. Will it work?
Thank you,
Yours Sincerely,
Dipsana
The short answer is yes.
However, there are many other considerations.
I created a guide for multibooting Linux and Windows.
Much of the information you will find in that guide will no doubt be useful when you’re ready to begin. Remember to disconnect the Manjaro SSD before installing Windows to the new SSD, to make sure Windows doesn’t create an $ESP on the wrong disk.
Good luck.
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I have Win10 and Manjaro installed both in Legacy mode with MBR on both drives.
I never faced boot problems this way, because Legacy/MBR create a clean cut.
Thanks @soundofthunder. That is indeed a very detailed post of the errors you can face when installing two OSs in different disks. If this forum exist when I’ll commence windows installation and if I face any problems, I’ll reply.
I’m reasonably sure the Forum will still be here. You are welcome to create a new Support thread if you have any difficulties.
Cheers.
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