Cannot detect Windows 8 from Ubuntu 12.04 Live USB installation on Toshiba qosmio x870

From other questions raised, I read that if Ubuntu Live USB boots in UEFI mode then it should detect Windows 8 during installation. During installation, I only see two options, Erase disk and install Ubuntu and Something else. I don't want to Erase disk and install Ubuntu but Install Ubuntu alongside windows 8. How can I enable the Ubuntu 12.04 Live CD/USB to detect the existing Windows 8? Thanks.

Sorry the latest response.

@Rod here are the screenshots as requested:

@Paddy here's the result from running sudo parted --list:

ubuntu@ubuntu:~$ sudo parted --list
Model: ATA TOSHIBA MQ01ABD1 (scsi)
Disk /dev/sda: 1000GB
Sector size (logical/physical): 512B/512B
Partition Table: gpt

Number  Start   End     Size    File system  Name                  Flags
 1      1049kB  473MB   472MB   ntfs         Basic data partition  hidden, diag
 2      473MB   746MB   273MB   fat32        Basic data partition  boot
 3      746MB   880MB   134MB   ntfs         Basic data partition  msftres
 4      880MB   990GB   989GB   ntfs         Basic data partition
 5      990GB   1000GB  10.4GB  ntfs         Basic data partition  hidden, diag


Model: WD 1600BEV External (scsi)
Disk /dev/sdb: 160GB
Sector size (logical/physical): 512B/512B
Partition Table: msdos

Number  Start   End    Size   Type     File system  Flags
 1      1049kB  160GB  160GB  primary  ntfs


Model: TOSHIBA TOSHIBA USB DRV (scsi)
Disk /dev/sdc: 8011MB
Sector size (logical/physical): 512B/512B
Partition Table: msdos

Number  Start   End     Size    Type     File system  Flags
 1      4129kB  8011MB  8007MB  primary  fat32        boot, lba

Thanks!

Mount EFI to /boot/efi but DO NOT FORMAT then after that, mount your other partitions (eg /home /). Install and reboot. You will now boot to Ubuntu so you can configure grub.cfg to be visible and add a Windows option. I have no experience in installing Ubuntu on EFI as I am an Arch user but this should help. EDIT

This will not work if you did not boot Ubuntu from UEFI. To boot DVD/USB in UEFI keep it enabled but disable secure boot option in BIOS. Do all as root sudo -i or su root List all your partitions with cat /proc/partitions Make an efi directory mkdir /boot/efi Mount your EFI partition eg: mount /dev/sdX /boot/efi Install grub-efi apt-get install grub-efi Finally, install grub. Grub will automatically add option to Firmware Boot Manager. grub2-install --target=x86_64-efi --efi-directory=/boot/efi --bootloader-id=Ubuntu --recheck --debug