encase it is double quotes:

for example:

diskutil list | grep "Macintosh HD"

@acdesigntech - I'm sorry I don't understand what that means.

sorry, typo. I meant encase it IN double quotes. so take your command and put double quotes around the drive name. That way it will preserve the space between macintosh and hd.

Something like:

diskutil secureErase freespace 3/ Volumes/"name-of-drive"

I get this for a response

Kens-Macbook-Pro:~ Ken1$ diskutil secureErase freespace 3/ Volume/"Macintosh HD"
Could not find the disk Volume/Macintosh HD

I can't think why it can't seem to find my hard drive. The icon on my desktop sayings Macintosh HD in white under the icon. I have to believe that's the name, correct?

Try Volumes & not Volume.

Kens-Macbook-Pro:~ Ken1$ diskutil secureErase freespace 3/ Volumes/"Macintosh HD"
Could not find the disk Volumes/Macintosh HD

lol going insane here

Sorry. Try: /Volumes/ then.

winnah winnah chicken dinnah!! Thank you!! :)

No worries.

I've wasted hours over silly syntax issues too.