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bearvsshark

macrumors member
Original poster
Oct 4, 2009
44
0
I have just erased my imac startup disk using the lion osx dvd and disk utility. I chose to do a zero pass format and after about 3 hours, it is done. When I click on the partition that was created though, it says there is 851.7mb of used space on the partition. I am confused since I formatted it, shouldn't there be no used space? Or is that 850mb being used for something that I can't prevent?

Here's a screenshot of my drive. Any help would be greatly appreciated.

Image
 
yes system files and file system catalogs do take up more space on a larger drive that's why it becomes more noticeable, before OS X changed it's way of calculating bytes that number would seem even larger.
 
yes system files and file system catalogs do take up more space on a larger drive that's why it becomes more noticeable, before OS X changed it's way of calculating bytes that number would seem even larger.

Thanks for the help. One more thing, if I click on my partition in disk utility, the erase free space... button becomes available. What does it do and should I do that before installing lion? Thanks again.
 
All erase free space does is create a gigantic file the same size as your free space and then deletes it. If you've zeroed out that's more than enough.
 
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