Dual Boot Issues. Manjaro/Windows 10, separate drives

I'm having issue getting the GRUB menu to show up on boot. I am using two different drives, both 120 gb with the respective Operating systems loaded onto them.

I installed Manjaro first then Windows 10 which I now know was a mistake as all guides I've read instruct me on how to fix it using a certain install method, but unfortunately I feel just too deep into having set this Manjaro installation up to bare with reinstalling and starting from scratch.

I've had no luck finding any answers.

Use this [Simple Configfile Method].

Thank you for the timely response!
It mostly worked as a charm, downside is Windows 10 is not showing in the menu. Is there perhaps a specific way I need to configure the BIOS boot order, or perhaps a setting in Manjaro I need to configure?

First try

sudo update-grub

If windows still does not show up, it is likely that windows and manjaro are not installed in the same mode (uefi or bios-legacy). Then from the link, print out output from the section [If further Help needed].

I should note, the Windows install is fresh. I would have no problem reinstalling it if it's possible to fix the issue doing that.

Where are the rest of the output?
You have only provided 'sudo parted -l'.

Anyway, it is clear just from your 'parted-l'
You have either installed manjaro in bios-legacy or did not have a /boot/efi if installed in uefi or installed in uefi to a msdos disk. See [Common Installation Issues] in that link.

READ THE LINK

I am starting to understand a bit what's wrong, though it's late and I'm a bit fried. I did attempt some fixes but nothing has worked yet.

Sorry for forgetting the rest of the commands, I did them but forgot to copy them.

parted -l
Model: ATA SanDisk SSD PLUS (scsi)
Disk /dev/sda: 120GB
Sector size (logical/physical): 512B/512B
Partition Table: msdos
Disk Flags:

Number Start End Size Type File system Flags
1 1049kB 120GB 120GB primary ext4

Model: ATA PNY CS900 120GB (scsi)
Disk /dev/sdb: 120GB
Sector size (logical/physical): 512B/512B
Partition Table: gpt
Disk Flags:

Number Start End Size File system Name Flags
1 1049kB 556MB 555MB ntfs Basic data partition hidden, diag
2 556MB 661MB 105MB fat32 EFI system partition boot, esp
3 661MB 677MB 16.8MB Microsoft reserved partition msftres
4 677MB 120GB 119GB ntfs Basic data partition msftdata

Model: ATA TOSHIBA DT01ACA0 (scsi)
Disk /dev/sdc: 500GB
Sector size (logical/physical): 512B/4096B
Partition Table: gpt
Disk Flags:

Number Start End Size File system Name Flags
1 1049kB 500GB 500GB ext4

Model: USB DISK 2.0 (scsi)
Disk /dev/sdd: 4105MB
Sector size (logical/physical): 512B/512B
Partition Table: msdos
Disk Flags:

Number Start End Size Type File system Flags
2 2895MB 2899MB 4194kB primary esp

Model: WD easystore 25FB (scsi)
Disk /dev/sde: 8002GB
Sector size (logical/physical): 512B/4096B
Partition Table: gpt
Disk Flags:

Number Start End Size File system Name Flags
1 1049kB 8002GB 8002GB ntfs easystore msftdata

Model: ATA SanDisk SDSSDH3 (scsi)
Disk /dev/sdf: 512GB
Sector size (logical/physical): 512B/512B
Partition Table: msdos
Disk Flags:

Number Start End Size Type File system Flags
1 1049kB 512GB 512GB primary ext4

blkid
/dev/sda1: UUID="2be6e6bf-62fe-4dbe-abb6-ae8910ab20a8" BLOCK_SIZE="4096" TYPE="ext4" PARTUUID="a0720a65-01
"
/dev/sdb1: LABEL="Recovery" BLOCK_SIZE="512" UUID="7690486A90483343" TYPE="ntfs" PARTLABEL="Basic data par
tition" PARTUUID="57b0ae26-def2-4a30-b1ea-72d7a3e0136c"
/dev/sdb2: UUID="524D-7758" BLOCK_SIZE="512" TYPE="vfat" PARTLABEL="EFI system partition" PARTUUID="7df018
e6-d6c2-4ba6-a232-d5cd428a1185"
/dev/sdb4: BLOCK_SIZE="512" UUID="AE6252C962529645" TYPE="ntfs" PARTLABEL="Basic data partition" PARTUUID=
"a6ffe41c-4a26-4ea3-b8a0-5bd6383896d3"
/dev/sdc1: LABEL="(sdb) HDD 500 GB" UUID="66f85458-8a09-427b-a248-256c4296eb03" BLOCK_SIZE="4096" TYPE="ex
t4" PARTUUID="36d51b3e-75d5-4667-bbfd-af368a1b6328"
/dev/sdd2: SEC_TYPE="msdos" LABEL_FATBOOT="MISO_EFI" LABEL="MISO_EFI" UUID="1443-38AC" BLOCK_SIZE="512" TY
PE="vfat"
/dev/sde1: LABEL="Footage and Video Stuff" BLOCK_SIZE="512" UUID="2E20553C20550BE9" TYPE="ntfs" PTTYPE="at
ari" PARTLABEL="easystore" PARTUUID="98f18804-e694-422c-893a-b7e6dff7487b"
/dev/sdf1: LABEL="(sda) SSD 512 GB" UUID="40889403-96f6-4a39-a706-cf19d46960bc" BLOCK_SIZE="4096" TYPE="ex
t4" PARTUUID="48599a89-01"
/dev/sdb3: PARTLABEL="Microsoft reserved partition" PARTUUID="c00371a6-4a92-478c-b7e6-99cbadf6585c"
/dev/sdd1: BLOCK_SIZE="2048" UUID="2019-12-29-08-20-39-00" LABEL="MJRO1815" TYPE="iso9660"
/dev/loop0: TYPE="squashfs"
/dev/loop1: TYPE="squashfs"
/dev/loop2: TYPE="squashfs"
/dev/loop3: TYPE="squashfs"
/dev/loop4: TYPE="squashfs"
/dev/loop5: TYPE="squashfs"
/dev/loop6: TYPE="squashfs"
/dev/loop7: TYPE="squashfs"
/dev/loop8: TYPE="squashfs"
/dev/loop9: TYPE="squashfs"
/dev/loop10: TYPE="squashfs"

findmnt -s
TARGET SOURCE FSTYPE OPTIONS
/mnt/sda /dev/sda1 ext4 defaults

findmnt /boot/efi
(nothing?)

You still missed efibootmgr -v
That will show if you installed in uefi or bios-legacy.
Probably (and I am guessing here) that the output will be something like 'efi variables not found in this system'. That will mean you installed in bios-legacy.

Anyway, you do not have /boot/efi and your manjaro root is in a msdos disk.
Your windows is in gpt/uefi.

So, as written in [Common Installation Issues] in that link and stated above

Reinstall. Suggest you read the wiki on uefi installation first.
It is easier than the instruction booklets on tv recorders, car stereo systems or microwave ovens
(don't microwave eggs in shells).

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