Trouble with encryted disk image

OK.. here it goes. I'll start with expected "I'm new to Macs". I recently purchased my first Mac. Its an iMac running Snow Leopard 10.6.2. In the interest of securing my personal files I wanted to create an encrypted disk image to store them. So I opened up Disk Utility and with Macintosh HD highlighted in the left column I selected the "New Image" button. I think that was my first mistake, selecting the "New Image" button when Macintosh HD was highlighted because the resulting dialog only offered me Save As, Image Format and Encryption. It did not offer me Size, Format or Partitions. I selected to save the image as "Vault" in my Documents directory, and I chose compressed and 128 bit encryption.
Next I hit create and entered my administrator password and provided a password for encryption. It started chugging along and I noticed it was reading my entire Macintosh HD. The process took a good while. Finally it completed and as a result there was a (roughly) 150 GB .dmg image in my documents directory with the name I provided (Vault.dmg). FYI.. I had about 150GB of data on my HD when I started this little adventure.
Moving right along, when I tried to mount the disk I get an error saying "..(no mountable file systems". Here is the log output from disk utility:
===== Saturday, February 6, 2010 7:34:24 AM MST =====
2010-02-06 07:34:26 -0700: Attach Image “Vault.dmg”
2010-02-06 07:34:26 -0700: Initializing…
2010-02-06 07:34:28 -0700: Verifying…
2010-02-06 07:34:28 -0700: Verification completed…
2010-02-06 07:34:28 -0700: expected CRC32 $31E027DA
2010-02-06 07:34:28 -0700: Attaching…
2010-02-06 07:34:28 -0700: Mounting…
2010-02-06 07:34:28 -0700: Attaching…
2010-02-06 07:34:28 -0700: Finishing…
2010-02-06 07:34:29 -0700: Unable to attach “Vault.dmg.” (no mountable file systems)
2010-02-06 07:34:29 -0700:
FYI.. after I tried to mount the disk image via the disk utility I see a ghosted "Macintosh HD" appear under my Vault.dmg. To make matter worse I can't erase either of these because everything on the Erase tab is disabled (grayed out). So at this point I'm pretty sure I created a compressed disk image that has a copy of all my data which is not what I wanted.
At this point I just want to erase this ridiculously large and unmountable disk image, and start over. Can any of you fine people help me?
Thanks.
Message was edited by: docdee24

Some systems will auto open. With my settings, I right click and mount the disc image, then play. When I'm finished, I eject the "disc." If you're not ejecting the mounted image, perhaps the Mac is confused about which disc to play.
John

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    2013-11-07 10:39:32 -0500:

    I just got a call back from the upper level support person at apple care who had been advising me on my trouble with time machine and my LaCie 1 TB FWD. I had sent her much of the same verbiage as I posted here. As some of you have probably figured out, the verdict is that the drive is probably failing. She says this because I have had to do two erase and reformats. She thought that the intermitant problem that I have had with the drive unmounting when my iMac wakes from sleep could be related to the drive failing.
    In the meantime I have a secondary back-up (not using time machine) and the LaCie  1 TB FWD is working for the moment.
    Thanks to all who read all my verbiage.
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    Message was edited by: njtreehugger minor edits and update

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