hey,
i have done all that. every time i get to , partition selection combo box VO 
always says dimmed.
thanks

Michael
On 26 Jul 2014, at 5:44 pm, Christopher Hallsworth <challswor...@icloud.com> 
wrote:

> 1. Boot from the external drive and launch Disk Utility.
> 2. Interact with the table, choose the very first item which is the disk 
> itself, then stop interacting.
> 3. Select the partition tab.
> 4. In the layout pop-up button, choose 1 partition or however many partitions 
> you require.
> 5. Click options button and make sure guid is selected. Click ok button.
> 6. Click apply button. Click partition button.
> Hope this helps.
> 
> On 26/07/2014 02:10, Michael Marshall wrote:
>> hey all,
>> this morning i made myself a bootible installer drive for the mac. now that 
>> this is done i want to know how to entirely wipe my internal Mac hard drive.
>> i want everything gone including all partitions, basically a factory reset.
>> i have an external drive that i can boot in to with a Mavericks installer 
>> ready to go.
>> i have tried going in to recovery and using disk utility to try and erase 
>> everything but to no avail.
>> i have 1TB of space lost because of this stupid damn partition and i want it 
>> back.
>> am i able to wipe all partitions and start again using my external 
>> installation media?
>> thanks for any help
>> 
>> Michael
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worm-free.  However, this should in no way replace your own security strategy.  
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