Problem: securely erasing home folder after enabling file vault

I enabled file vault. It took 4 days (125 GB) to "securely erase home folder", then when it finally reached 100% I got an error message that it could not be erased after all. I also now got an icon on the desktop (protected house) showing my home folder. Anybody experience with this? What do I do to securely erase? What can I do to speed it up? I have 4GB RAM and a HD of 500GB

open /Applications/Utilities/Terminal.app
At the prompt type:
diskutil secureErase freespace 0 /
(press return)
This will secure erase free space on your boot volume.
Level "0" (zero) is a Single-pass zero-fill erase. Levels 0 through 4 are supported.
Here is a full description of the different erase levels: 0 - Single-pass zero-fill erase.
A. 1 - Single-pass random-fill erase.
B. 2 - US DoD 7-pass secure erase.
C. 3 - Gutmann algorithm 35-pass secure erase.
D. 4 - US DoE algorithm 3-pass secure erase.
for more info (in Terminal) type:
man diskutil
(press return)
This should take considerably less time than 4 days. On my Mac Pro with 162GB boot volume,
130GB free (I keep my data on a different volume) it takes about 10 minutes using level "0".
Disk Free Space Warnings are normal during operation and can be ignored.
more info about it from apple support:
http://support.apple.com/kb/TA24002
You can invoke the erase procedure from Disk Utility GUI interface, but it usually is quicker
when run from terminal.
Kj ♘

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