Snow Leopard: Zero-out can't unmount disc

[Gira]

Hi everyone! I've been embarking on the exciting saga of getting BootCamp up and running all day, and right now I'm trying to shuffle files around on my disc so there's enough room for BootCamp to work; I have a tendency to download files and then delete them later, so there are patches all over the place. |D Anyway, I've been following this tutorial to do that. Right now I'm running from an external hard drive, placed via Carbon Copy Cloner, etc. I'm having trouble with this bit: "...you have to erase the internal OS X "Macintosh HD" partition (while booted from the clone) using the Disk Utility > Zero erase (middle option)..." When I try to Zero Erase, it tells me that it failed because the disc couldn't be unmounted. Anyone got a clue about why this is?

(For what it's worth, I'm on a late 2010 MacBook Pro running Snow Leopard. There's about 52 GB left on my main disk.)

 

[simsaladimbamba]

Normally you do not have to use any Security Options like ZERO OUT or 7-PASS ERASE to format your internal HDD to clone back to.

Once you have cloned everything to the external HDD and can boot from it and have verified everything is there, you go to Disk Utility and just format it like this:

How to format a new HDD to install Mac OS X onto (or make a bootable copy onto)​

 

[downtonmac]

Zero out problems

I'm having problems zeroing out as well. I tried the one pass, but had to stop at the end of the process while it was creating temporary files. Does this mean all progress was lost? I understand this is about writing zeros in the free HD space, so were no zeros placed? Thanks for your help.

Running 10.4