Separately encrypt dual-boot system: Windows+Arch

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https://bbs.archlinux.org – Hey guys, I want to use a dual-boot system: Windows 7 + Arch (windows being first on hdd). I would also want to encrypt them, but make it so I could access them with different passwords, like if I enter arch, i woudn't be able to see contents of windows, and vice-versa. I need arch to be on LVM, ext4 filesystem(the latter not so important, if it's trouble).I've come accross this guide: https://aprescott.com/posts/dual-bootin … encryption which describes windows 7 encrypted with truecrypt + arch(on lvm) encrypted with dm-crypt+luks, grub legacy is put inside MBR, truecrypt boot (HowTos)