> my OSX and Debian files could be shared when booted into either You can but you'll have to share data on a non-journaled HFS+ partition for it to be writable

> my OSX and Debian files could be shared when booted into either You can but you'll have to share data on a non-journaled HFS+ partition for it to be writable from Linux. Watch out for UIDs/GIDs: https://wiki.archlinux.org/index.php/MacBook#Home_Sharing https://wiki.archlinux.org/index.php/MacBook#Home_Sharing ArchLinux has their img booting from usb, so I don't see why not.