putting BT4 on an external hard drive

For starters, this is my External Hard Drive (Link

Okay, I've been using BT3 for a couple of years now, and I've been wanting to give BT4 a spin, however I don't want to burn a DVD for it.

Also, I only have a single 1GB Flash Drive so that won't work.

I do however have a 500GB External that I use for every day storage. It's got ~100GB full at the moment but I don't want to delete any of that stuff.

Is there any way that I can partition some space for BT4 on it, preferably with Gparted? And then would it even be able to boot properly if I do this?

*Also as a side note, Should I do Live USB or Persistent USB when doing this? Which do you think would be better?

Yeah, that should work. Just set-up a partition on you external drive (8GB should be suffiencient for an evaluation spin of BT4). Format that partion FAT32 and use Unetbootin to install BT4 on it.

I recommend a persistent USB installation. Good luck.

Installing it like a USB didn't work so I went and installed it like you would normally install an OS.
But apparently, It will only boot if I remove my Hard Drive. Probably because I'm using Grub with BT and using NTDLR with Windows

Yikes!! You shouldn't have to remove your HDD. During boot go into BIOS settings and make USB boot the first option.