Partitioning an external Firewire drive

Hi,
I'm trying to partition an external 150gb Lacie Firewire drive with the Disk Utility under OSX10.3.9 and I've gone through the Erase procedure and DU is telling me I'm left with 149.1gb after formatting.
So now under the partition tab I'm trying to set out the size of each partition and I know these sizes are gonna sound a bit random but bear with me so I want :-
3 partitions of 10gb = 30gb
6 partitions of 8gb = 48gb
1 partition of 71.1gb
After setting, naming and locking the first 9 partitions, when I get to the final partition, which I want to be 71.1gb, DU won't let me set a figure above 16.81gb.
Now I fully appreciate that disk sizes are, to a degree, 'approximate', that after formatting you do 'lose' a few gb's and that each partition will have a filesystem installed on it but where the heck am I losing 54.29gb of storage space from ?!!
I have experimented with fewer partitions and, to be fair, it seems you lose less space with less partitions but is it really the filesystems on each partition eating up that space ?
I'm using HFS+ (journalled).
Many thanks for any help you can give as this has been a real headache today !
Nick

Hi roam,
Many thanks for your continued input into this thread and my apologises for the delay in replying to your last post.
Anyway, I thought I'd give SuperDuper a go and downloaded v2.1.4 as you suggested and must agree that it's very simple to use. The backup took twice as long as my old way of backing up (restoring from the internal drive to the external drive) and I checked the log file for any errors and there weren't any, so all good there.
I again restarted with the option key held down and yet again I'm only ever presented with one drive icon to boot from, not two, so I'm really not sure why this is happening.
However, I've been giving this quite a lot of thought and I've come to the conclusion that if my internal system drive was to suffer a catostrophic failure (I'm touching loads of MDF here as I type that !!) and the drive is either wiped clean or damaged to the point that I replace it, I wouldn't be booting from my Firewire drive anyway, I'd be restoring from it, so I'd insert my install CD and reboot whilst holding down C, I'd then run Disk Utility and restore from my Firewire drive to the new internal drive.
So what I really want is a mirror image of my internal drive which is what my method of restoring via the restore route gives me.
Is that a correct hypothosis of have I missed something ?
Nick

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    Message was edited by: Roy Vincent
    Message was edited by: Roy Vincent

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    As the MacBook's internal hard drive is not sufficient to record and playpack efficiently, I was advised to get an external Firewire Drive. Given that I have very little space on my laptop - (am running windows on a partition also) I am trying to save my logic files to the external HD. When creating tracks specifically using Audio Instruments, the playpack keeps cutting out.
    I am connecting the HD via usb 2. I am also having to freeze the tracks in order to record more layers. There is lots of clipping and latency. I thought by using the external, this problem would be resolved.
    The HD is not playing back the tracks fast enough, and keeps cutting the audio out. The audio cuts out everytime the blue light on the drive flashes.
    I cannot save the files to the MackBook HD as there is notenough space.
    Is there something very wrong with my setup?
    any advice would be really appreciated.
    ps. I am a bit of a newbie
    thank you in advance.
    Spy

    Connect it via firewire 800. USB2 is not good for audio or video streaming.
    I have 3 D2's connected to my mac pro, works like a charm.
    good luck.

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