I have a refurbished Lenovo t450s with windows 10 installed on it. There are 3 ntfs partitions (windows, restore, and a 100mb system partition) and a 4th partition that I installed Manjaro KDE on (as well as some unpartitioned space) on what I believe is 2 ssds (an internal and an mdot drive is how I think the t450s is set up) set to be one logical drive (either that or it's just one SSD, but all I have is same, not sdb). I don't remember what I formated the Manjaro partition as but I assume ext4 with 4k blocks. However after restarting one day GRUB is giving me a "error: filesystem unknown" in rescue mode. ls'ing all the partitions just returns the same error. Booting into the live CD lsblk gives doesn't show a recognized filesystem on that partition. e2fsck says there may be an error with the super blocks, but checking all the backup super blocks for 4k block size doesn't work either (I haven't checked 1k or 2k yet). The firmware is set to boot into bios/legacy mode first and then try uefi.
I was going to install another copy of Manjaro in the unpartitioned space and the see if I could recover the broken partition later and/or boot into and back up windows and start from scratch, but since it is using MBR, it only allows for 4 partitions.
There isn't really anything important on the computer yet, but in case there was I'd like to know/learn if there is a proper way to fix it other than deleting and reinstalling Manjaro.
Is there a way for me to boot into windows 10 with grub not working and without a windows recovery disk?