From root, where can I access the
C: drive on my Windows partition?
Technically it will be available under
/media/Your-User-Name/UUID-Of-Partition/, only if your first mount it using GUI, e.g:
You can use:
ls -l /dev/disk/by-uuid/ | grep -i sd
to have a list of your partitions UUID's.
sudo blkid /dev/sda1
for a specific partition.
Otherwise first you should find out which one of your partitions are actual "C:\" you can use
fdisk for this purpose, e.g if your hard drive is
sudo fdisk -l /dev/sda
gives you a list of your partitions:
/dev/sda1 * 2048 999423 997354 /dev/sda2 * 1001470 9767710 97576960
Alternatively you can use
grep sd /proc/partitions too.
then you can figure out which one of them is your "C:\" drive (Based on the partition size).
After that mount them somewhere, let's say
/dev/sda1 is your "C:\" drive:
sudo mount /dev/sda1 /mnt
now it will be available to you at