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Old Mar 19, 2009, 05:56 PM   #1
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Join Date: Nov 2008
Location: Guildford, UK
Erase free space error in Disk Utility

I wish to erase free space on my default boot drive "Macintosh HD" using the function provided by Disk Utility.

As I understand it, this process creates a file the same size as the free space on the partition and then proceeds to write to it as many times as specified (1/ 7/ 35). Since this slows down the OS when it is conducted whilst the boot partition is in use I decided to copy the partition to another HDD using Carbon Copy Cloner and then boot from that temporarily.

However, since the back-up HDD is slightly smaller (500GB as opposed to 640GB) I was forced to use the non-block level clone option in order to exclude a couple of large folders.

The other partition boots without any significant errors (just Little Snitch) but when I attempt to run the Disk Utility free space erase program, it throws up an unspecific error.

This is in contrast to what happens when I run the same program from the boot drive and erase free space on the back-up partition, which runs without a hitch.

Any ideas?
Mac Pro (Early 2008/3.1): Dual 2.8GHz, 6GB RAM, Apple Radeon 5770, 60GB OCZ Vertex 2 SSD (total HDD 4.7 TB), Dell 2408WFP, Dell 2209WAf, Logitech Z-5500 Digital, X-Fi Xtreme Audio

Last edited by OracleRedux; Mar 19, 2009 at 06:15 PM.
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