Bootcamp wants to use my whole USB drive

Hi all,
strange one here. A few months ago I used Bootcamp to install windows 7 without any issues. I've had to format the partation and am having to go through the process again.
The issue i'm having is when creating a Bootable USB Drive it only shows 1 Destination Disk (even though this USB drive is partitioned into 5 seperate drives). I was able to get the Boot Camp Assistant to view all the seperate drives before but I cannot remember how I did this (high chance it was luck).
Does anyone know why it is doing this and what I can do to make it see the partitions as I don't want to have to format a 320Gb usb drive just to install windows.
Thanks

A disk with five partitions can't be used for Boot Camp. Disk Utility hides some partisions so chances are you really have six or more partitions. Use the Terminal and type this command:
diskutil list
That will show the true number of partitions on the drives. A maximum of four partitions, including the one that will be used for Windows, is allowed if you want to use Boot Camp Assistant. Otherwise you'll need to look at 3rd party software, and off hand I don't know for sure if any of the trio capable of resizing both HFSJ and NTFS will work on a disk with more than 4 partitions either. Those being: iPartition, Winclone, and Camptune.
GPT fdisk, a.k.a. gdisk, is free open source software, and it can create the necessary hybrid partition scheme, albeit it'll be even more non-standard than Apple's variety so you may run into problems down the road that I can't predict. Frequent backups are the way to mitigate that. Gdisk will let you add specific GPT partitions into the hybrid MBR, whereas Apple always does it 1:1, GPT partition 1 is mapped to MBR partition 1, GPT 2 goes to MBR 2, and so on. And MBR can only hold 4 entries. So as soon as you have a fifth entry, Apple's tools won't create a hybrid MBR.
gdisk, however, is a command line only program. It has an interactive mode so it's not totally obscure but it's not everyone's cup of tea.

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