File Vault Question!

So could someone please tell me what exactly is file vault, and how is it/ what is it used for?
thanks all!

Wow! You should have stated that at the onset. Read Niel's link for the details. Additionally, there's http://docs.info.apple.com/article.html?path=Mac/10.5/en/8727.html and further links there. Thanks for the feedback. Good luck with your new Mac (if you ever get one).

Similar Messages

Time Machine and File Vault question

I just completed a clean install of OS x mavericks and then used my time machine back up to restore the mac.
The whole process was confusing for many reasons and I just want to get some clarification/verification on my next actions.
When I enter time machine preferences and click select disk. It gives me two choices. One in the group Back Up Disks and One in available disks. The confusing I have is that it is the same external hd. So which should I pick if I want to keep my original time machine backups?
The other question I have is, this whole journey started with me wanting to turn on file vault. I am using a late 2012 Mac Mini updated to Mavericks came with Mountain Lion.
Should I be able to use both an encrypted time machine (external hd) and file vault?
Thanks for the help.

The difference is that do yo want to combine the backus you made before with the previous backups (group Back Up Disks) or start a whole new backup (available disks). Either option will retain the previous backups unless you overtly delete them. I would select that later to start a new set of backups.
See the following for using FileaFault with Time Machine
http://apple.stackexchange.com/questions/46833/with-file-vault-on-are-time-machi ne-backups-encrypted
http://kb.mit.edu/confluence/display/istcontrib/Enable+FileVault+(whole+disk+enc ryption)+on+Time+Machine+backup+drives+on+OS+X+10.9

File Vault Question for my Mac Mini, OSX 10.3.9, , Permissions issue

I work in an office dominated by PCs, and I was offered a mac mini to be able to take home to do extra work on/with. I jumped at the chance because I have a lot of different mac hardware at home and this one is a new box to add to the collection, but it also can be immediately useful.
Here is my problem, one of the guys here had it at home for a while to "evaluate" it and enabled filevault, as well as forgetting the password he chose. I was able to make myself a user and can install some apps, but I need network permisisons and some other higher level admin permissions. I can't re-install the OS, format the HD, or anything without getting past filevault.
Does anyone have a suggestion about how to bypass it? I don't need any data, I need to be able to administrate on this machine to use it as a server. Any thoughts regarding filevault are welcome, I am hesitant to try and crack it open to replace the drive, so I'd prefer a software solution. Thanks.

You're Welcome EatBrains!
I'm happy you got the MacMini working for you!
And here is some additional info for you.
Tiger is available for purchase at The Apple Store (U.S.).
Jaguar and Panther, are no longer available directly from the Apple Online Store, as Tiger 10.4.x is the most up to date OS.
If you know what to look for, Jaguar Full Retail CDs, a Full Retail Version, of the Panther Install CDs, or a Full Retail Version, of the Tiger Install DVD, can also be purchased rather inexpensively, at some online Apple retailers, Amazon, eBay, AppleRescue, FastMac, etc.
Be sure not to purchase grey, upgrade or machine specific CDs or DVDs.
Jaguar and Panther are only on CDs, not DVDs.
The discs should look like the images in the above links.
Additional info in these links.
Using OS X Install CDs/DVDs On Multiple Macs
Note # 2 of the Single Use License in the Software License Agreement:
"2. Permitted License Uses and Restrictions. This License allows you to install and use one copy of the Apple Software on a single computer at a time. This License does not allow the Apple Software to exist on more than one computer at a time, and you may not make the Apple Software available over a network where it could be used by multiple computers at the same time."
You may upgrade up to 5 Macs in your household, with the Family Pack, purchased for $199.00, at The Apple Store (U.S.).
What's A Computer Specific Mac OS X Release
Software Update, Upgrade: What's The Difference?
If you decide to do an Erase & Install of Jaguar 10.2.x, you can use the 10.2.8 Combo Update,
or if Panther 10.3.x is installed, you can use the 10.3.9 Combo Update, to upgrade to the final version of either OS.
If your Mac meets the System Requirements for Tiger, you could also consider installing that.
And then use the PPC 10.4.8 Combo Update, to upgrade to the current version.
Panther System Requirements
Additional Panther System Requirements
Tiger System Requirements
Shop Carefully, Examine All Documentation, And Good Luck!
ali b

Several questions regarding File Vault

Hi!
I have several questions regarding File Vault - right now I'm using Mac OS 10.4.8
1.: The battery lock of my iBook is defect thus it happens from time to time that while transporting it the battery drops out while the laptop is sleeping. What happens with the File Vault-disk image?
2.: I want to (have to ) set up my Intel iMac again. The installer-CD I have will bring it back to 10.4.6
AFAIK the data format used for File Vault since 10.4.7 is version 2. What happens if I encrypt my stuff now (10.4.8 - thus version 2), back it up to my backup disc, install a new system (10.4.6 - therefore version 1) and want to access my data via Migration Manager (don't want to use archive and install)?
3.: How do I actually do a backup of my data while the system is running? The backup should be encrypted as well.
I use the demo-version of SuperDuper for backing up my system because with it I can ensure that I have a complete bootable backup of my running system.
Thanks for your answers in advance
ibook g4 12" 1.2 GHz 768 MB RAM / Intel iMac Core 2 Duo 17" 2.0 GHz 2GB RAM Mac OS X (10.4.8)

Parker,
You said:1. If it did, Apple would not use FileVault, as everyones computer will have a battery problem once in their life, and Apple would lose buisness from angry people who lost all of their data.I have seen enough reports of data loss with FileVault that I feel compelled to dispute your statement.
In Data corruption and loss: causes and avoidance, Dr. Smoke writes...If your data-security needs demand FileVault, you should backup your encrypted Home folder regularly, preferably daily. Like any hard drive or disk image, a Home folder protected by FileVault — an encrypted, sparse disk image — does not respond well to the causes of data corruption...Loss of power definitely is a cause of data corruption.
For Niels....,
An Unencrypted Look at FileVault, by François Joseph de Kermadec is an excellent discussion of the features, pitfalls, and cautions regarding Filevault.
Although the article discusses Panther and is dated 12/19/2003, the concepts as they apply Tiger have not changed.
The cautions and warnings are prominent in any of the Apple Knowledge Base articles referring to the use of FileVault. If a user is unfamiliar with any aspect of FileVault, it should not in my opinion be activated.
As good as FileVault is in protecting your sensitive data, it also presents the danger of locking up your files in an irretrievable ball of one's and zero's. Backups are critical. You must ensure that you have a comprehensive backup plan. Backup and Recovery, by Dr. Smoke is a fine example of what you need to consider.
;~)

Forgot Master Password, no acct File Vault: How to get rid of Mst Password?

Hi -
I am embarrassed, mortified, and humbled about having to post this because it's not about 'someone I know' but about something careless that I did.
This morning, I set up a second account with File Vault on my MBA (Late 2010) to keep sensitive files in it. While setting it up, I set a Master Password which I hadn't enabled before this morning. I used the password generator and used one that I dutifully copied on the clipboard with the intention of IMMEDIATELY copying it into my 1Password app. Then I set up the second account with File Vault.
Well, of course, something distracted me, I habitually copied something else on the clipboard, and I lost the Master Password from my clipboard. (I know, I've been kicking myself ever since...)
Here's my question: The Master Password is not protecting any content in File Vault and I would like to disable the forgotten Master Password and set up one that I really will remember (at least, that's the plan!). How can I do this?
I deleted the new account and I have only one other which is the primary administrator account that is not protected by File Vault. Thanks in advance for any help on this!
(possibly similar to this parallel topic: http://discussions.apple.com/thread.jspa?messageID=13321714&#13321714)

See this thread:
*How to reset FileVault master password*
http://discussions.apple.com/thread.jspa?messageID=5822772
As explained there, and for obvious security reasons, a new master password created in this fashion way will not unlock any pre-existing FileVault accounts. So resetting the master password is only useful after you have turned off FileVault in all existing accounts, as is true in your case.

How can I repair a File Vault sparsebundle?

Apple has directions for repairing a File Vault sparseimage under 10.3-10.4 here:
http://support.apple.com/kb/HT2631
I couldn't find anything more up-to-date, so I followed those directions but using the different permissions setup in 10.5. Everything seemed to work fine up until it came time to mount the sparsebundle. It wouldn't mount. I could drag the sparsebundle into Disk Utility, but when trying to "Repair" or "Verify" I get this error message:
Unable to attach “testserver.sparsebundle”. (Operation not supported on socket)
\[DUDiskController viewablePartitions\] expecting DUDisk, but got nil
As I was typing this post, I figured out what to do. Being an Admin doesn't cut it; you have to be root. I did not find it listed online, so I'm jotting it here; do this instead of what Apple says:
1. Disconnect from the network (turn off AirPort, unplug Ethernet) because we're about to temporarily log in as root, which could leave us exposed.
2. To enable the root user, open Applications / Utilities / Directory Utility. Unlock the icon with your admin password, then choose "Edit menu > Enable Root User". If this is the first time, enter a password for the root user, or if you have forgotten your root password, choose "Edit menu > Change Root Password".
3. Log in as root: Log out of the current account, then in the blank login screen, enter "root" as the username along with your root password. Or, if you have fast user switching enabled, make sure you are logged out of the FileVault in question, then pick "Login Window..." from the user menu. If you aren't allowed to type in a user name, open System Preferences > Accounts > Login Options, then disable "Automatic Login" and by "Display login window as" pick "Name and password".
4. Mount the sparsebundle: From the Finder's "Go" menu, pick "Go to folder..." and enter "/Users/". Drill down to the sparsebundle inside your FileVault account, and double-click it to mount it. When asked for your keychain password, cancel. Then you will be asked for your FileVault account's password. For security, make sure the "Store this password in my keychain" checkbox is NOT checked. Enter your FileVault password. The sparsebundle should mount.
5. Repair normally from Applications / Utilities / Disk Utility. The sparsebundle should appear as both a disk and a volume in the left pane of the Disk Utility. When done, quit, eject the sparsebundle and log out of the root account.
6. IMPORTANT: Log back in to a normal administrator account, open Applications / Utilities / Directory Utility, unlock it if necessary, then pick "Edit menu > Disable Root User". Lock the utility and quit.
7. If you disconnected from the network in step 1, it's okay to reconnect now.
From a security standpoint, it's best to leave the root user disabled. Most of the time, an admin user can get temporary root privileges; this just happens to be an exception.

Figured it out and shared solution.

HELPDeleted user account with file vault on to free disk space, to no avail

My saga is a long one. Quick telling: I am the administrator on my eMac, and was locked out of my desktop last spring when the disk became overly full. File vault was turned on, and I was told by my computer repair folks that since the desktop was encrypted, it could not be accessed. A sad situation, since I had not backed up the disk, and had years of family photos that were lost, not to mention iTunes, Quicken, and more.
Since then I bought a back-up disk, and saved a copy of that desktop, just in case.
My computer is overly full again, and today I decided to delete my old user account in order to free space. Of the 160G in this computer, 80% was associated with that user (that is, me). I deleted account via the System Preferences window and its Accounts window.
I emptied the trash, and 'got info' on my hard drive, only to see that nothing had disappeared, memory-wise! I am still nearly full--only having 2G available, rather than the 130 or more that I had hoped to free up.m I restarted too.
I went to Apple Support to find that one should turn off File Vault before deleting a user account. Unfortunately, this is impossible for me, since I can not/could not access the user account to turn it off.
SO here is my question: is there a way to delete the files of a user account that had file vault turned on, but that is inaccessible? There is no deleted user file in my User folder, by the way.
I am not suer what to do. Any help is appreciated.

Thanks for your insights.
The Tech Tool report happened after AppleJack, and never showed up before that. Restarting again just now, it showed up again.
I had not emptied the trash, but did now, and the 'get info' on my hard drive still shows that I have used nearly all of my 160 GB.
Re Disk Warrior: I do have it and just ran it. I emptied trash again and checked to see available disk space: I have 2.47 GB, so the problem still exists.
Here is the disk warrior report for the first part of its tests:
DiskWarrior has successfully built a new optimized directory for the disk named "Hildegarde." The new directory is
ready to replace the original directory.
There is not enough contiguous free space for a fail-safe replacement of the directory. It is highly recommended that
you create 204 MB of contiguous free space before replacing the original directory.
All file and folder data was easily located.
Comparison of the original and replacement directories indicates that there will be changes to the number, the
contents and/or the attributes of the files and folders. It is recommended that you preview the replacement
directory and examine the items listed below. All files and folders were compared and a total of 14,627,488
comparison tests were performed.
• Errors, if any, in the directory structure such as tree depth, header node, map nodes, node size, node counts, node
links, indexes and more have been repaired.
• 1 folder had a directory entry with an incorrect custom icon flag that was repaired.
Disk Information:
Files: 552,652
Folders: 131,014
Free Space: 2.47 GB
Format: Mac OS Extended
Block Size: 4 K
Disk Sectors: 321,410,736
Media: HDT722516DLAT80
Time: 11/28/08 6:54:19 PM
DiskWarrior Version: 4.1

Can't log in / supposedly file-vault

I have a power mac, which I recently updated to Lion. I've never used a password before and yet after an unusual abortive boot (unusual boot-sequence which hanged, which I had to hard-reset) I now get a login screen, which since I've never had a login in the first place, I can't get past (tried apple-ID for instance, to no avail).
I did the usual disk scans from recovery mode (which showed no problems), so I eventually ended up having to bring it in to the local apple-reseller (no 'official' apple-stores here). He says I've enabled file-vault and that he can't get to it without the username and password.
Now I can't for the life of me figure out how this could be, and file-vault isn't exactly the kind of thing you can enable accidentally. There was a progress indicator on the unusual boot, which might kind of support this idea (of an encryption process), but otherwise I'm worried that it might not necessarily be the problem.
I've had a search around, and I can't find any similar problems, so I'm just wondering if anybody on here might know if either:
File Vault can somehow become automatically enabled or ...
... some other automatic activity that could somehow bring this situation about
I want to satisfy myself that this is indeed the problem, and if so how could it have come about, so for instance I don't end up doing it again!
Update: From discussions elsewhere, it seems likely that the login screen I am seeing does correspond to a File-vault enabled login, so I guess all that remains is to discover how this could have happened in the first place ... and to determine if it is recoverable!

Have a look at > A flashing question mark appears when you start your Mac
Dennis

What happens if you Time-Machine backup an encrypted file-vault HD?

This is related to my previous post - but deserves special mention for those people who are using time-vault AND Time-Machine.
My question is this: If the backup of my Hard-drive is encrypted, and I then reinstall from backup, what will this situation likely produce?
This is what I have done. I also Archived and installed my Mac prior to installing from my Time-Machine backup.
I now have an error message that displays the following message at the login screen:
"Unable to log into the file-vault account "......." at this time. An error has occurred."
My password IS CORRECT. I have not changed it, and the log in window does accept my password, but it doesn't progress any further than the error message I gave above.
I'm wondering if the encryption process of file-vault is linked directly with the original installation I had of Mac OS-X before I Archived and installed.
Any thoughts/knowledge/Insight?? I want my old Mac back! (I don't recommend using file-vault). Any body else had this problem or can see what is happening to me here?
Thank you
Greg

I just did a backup, moved a folder with 600mb of images into a different folder, and did another backup. The free space on the backup drive dropped by the size of the folder's contents. The backup copied the files as I watched in System Preferences, and it looked like it was really copying the files to the external drive again. It looks like Time Machine isn't as smart as I hoped in this regard.
Still - I'd think the wasted space is only in the every-hour-for-the-last-24-hours bucket of Time Machine. I'm guessing the every hour backups are like a sliding window, where a backup that's 24 hours old drops out every hour rather than all the hourly backups getting wiped at midnight and starting over.
Regardless, only one version of the moved folder will eventually be stored as the daily backup for that day. I don't have proof, but that's what I think.
So, if you've moved a bunch of folders around or renamed them, the extra copies of the same exact files should drop off within 24 hours.
That's my interpretation, but I'm in no way positive!! The lengthy Ars review didn't offer an answer to this question.

Time Machine, File Vault and External Hard Drive

I use file vault on my well travelled MBP. When I get home I connect to my EHD for a regular backup using Time Machine. I am the only user on the MBP. My questions are:
Since the MBP is encrypted is the backup encryted on the EHD?
Should I ever need to restore from Time Machine using the EHD would I therefore need the password to access the backup?
If the EHD is NOT encrypted, how do I accomplish this and have File Vault work as seemlessly on the EHD as it does on the MBP
MacOS X 10.7.5
Thanks

1. Only if the external HD is encrypted, which can be done by formatting it as an encrypted volume with Disk Utility before setting it up with Time Machine, or by checking the option to encrypt the drive in the Time Machine system preferences.
2. No. The password for unlocking the drive is kept on the drive, so if you need to restore from backup all you should need is to supply the password when using the OS X Tools.
3. See #1.

Are my File Vault encrypted files backed up with Time Machine still useful?

The background:
My iMac G5 crashed. It all started one and a half years ago when my screen popped and the frequent hard shutdowns pobably damaged my HDD (the one elegant solution Windows have is the Windows button: press + 'u' + return = proper shutdown). After that episode I bought an external drive and started a Time Machine backup routine. What I did not realize, was the issues surrounding the use of TM with a File Vault encrypted system. In 2007 when I bought my G5, I poked around, getting myself familiarized in Mac OS X and found this thing called File Vault. It looked like something useful and I started using it. Later I upgraded my OS and after my screen problem, decided to make use of Time Machine. The one problem with Mac OS X is the ease of use. It's so easy that Apple probably cannot foresee all the dumb things we users are going to do with it, including a warning to first time TM users who have their system already encrypted with FV. Now, after searching the forums, I see the problems and the warnings. If someone use TM and then decide to use FV, a warning pops up, but not the other way around! At least, I never saw it coming. If there is such a warning, I probably did not read it - as I say, it all happens so easy and work so well, it's easy to use a Mac without reading the instructions. Yes, I did some dumb things, but that's probably because I'm not so dumb; too relaxed, yes. At least, so it seems to me : )
My problem:
Two weeks ago, my G5 suddenly started giving problems. Out of the blue I couldn't open Adobe Bridge. At first I thought it was a software problem and tried re-installing Bridge and searched the Adobe forums for a solution. After a long struggle trying different solutions, I eventually booted with my install disk and with Disk Utility found that there is a problem with my internal HDD. Only then it dawned on me that my problem is far more serious than a software problem but by then it was too late. I couldn't repair the HDD with DU and got an instruction to restore my system with a backup. No problem! I hooked up my external HD and pressed the button. The restoration took over 12 hours to complete. That in itself showed my that I have a big problem, but I did not dare interrupt the process. In the end I got a window with a 'Restart System' button. All I got from that was a white screen with a spinning wheel and that's where I am now. Needless to say, my G5 is now getting repaired.
My solution:
I have to keep going so I used my savings to buy another Mac. I have my backups, so I'll just do a Migration and keep working. Or so I thought. When I tried it, it obviously failed because I sit with encrypted backups that would only restore to the original machine - which crashed! After reading about it on the forums, it dawned on me that it is, most probably, a futile exercise. My backups are, most probably, no backups at all, because I also did not realize that I had to 'log out' of my FV to get TM to properly backup my files! In never dawned on me that I should log out! I have one machine at home and have no particular reason to log out at all!
My question:
Am I wasting my time with the 'backups' I have? Should I wait for my G5 to get back from the shop and see if they are useful, of should I just move on and try to live the rest of my life without all the electronic data I lost?

Gorrelduik wrote:
But they missed one situation: if Time Machine is set up, but auto backups are turned OFF, there's no message. If you turn it back on, there's no message then, either.
. . . and that's exactly my MO! I still don't have auto backup turned on. If it's better to use auto backup I'll do it, but to my mind it's better not to have both my computer and my backup disk on all the time. What happens when there is a power failure or lightning strike and both are on and both get damaged? My MO is to make a manual backup once a day and then put the external HDD away.
That's one of the reasons not to rely on a single backup, no matter where it is or how it was made. All hardware fails, sooner or later, no backup app is perfect, and things like lightning, fire, flood, and theft happen, too.
With a desktop Mac (and a U.P.S. system that both the Mac and External HD are on), you can let TM do it's hourly backups (although that won't help a lot with the current incarnation of File Vault), then keep secondary backups on a separate HD, perhaps a portable one, with a different app. See #27 in [Time Machine - Frequently Asked Questions|http://web.me.com/pondini/Time_Machine/FAQ.html] (or use the link in *User Tips* at the top of this forum), for some suggestions.
I have thought of doing another weekly backup on a different external HD that I keep at the office, but I'm still procrastinating that one. Now that I think about it, does Time Machine cater for that: having two backup routines on two different HDD's?
You can do that, but you must tell Time Machine each time you want to "swap" drives. But each will be complete and independent.

Should files be securely deleted if using File Vault?

Do I need to "shred" or in someway securely delete files and mail that sit in File Vault? I am new to the MacOS and I am not sure where deleted files/mail go. If they don't leave the Home Folder it should be ok but if they somehow are relocated outside the Home Folder, I assume I would have a problem unless they are securely deleted.

Interesting question, sgmiller.
The default Trash location is a hidden directory in your Home folder, ~/.Trash, which would be in your File Vault, assuming the File Vault includes your entire Home directory and doesn't leave anything out.
When you delete a file, its directory entry is updated, rewriting the parent directory of the file to the ~/.Trash folder. Then when you empty the Trash, the directory entry of the file is simply removed and the file disappears from the file system. They don't really go anywhere, they just disappear. However, the bytes still remain on the disk until something else comes along and writes to those sectors, so Secure Delete can be used to overwrite the previously used areas of the disk with zeros.
I guess it depends on how careful you want to be. You may also be interested in using Secure Virtual Memory if you aren't already, under "System Preferences->Security".
Clear as mud, my apologies!

Anyone have success recovering from a disk failure after turning on File Vault

My wife is running at 13" Macbook Pro Late 2011/Early 2012 running OS 10.7.3. I updated several Apple fixes and a firmware fix the other day for here. I also activated her File Vault to encrypt her files when not in use. She had some intermittent issues with slow startups yesterday and today I was forced to do a hard reboot. Swirling pinwheel that didn't seem tied to any application and and Command/Alt/Esc did not work to force quite or even see if anythng was hanging.
This morning I a was getting a white screen followed by a file with a question mark...I have attempted to use Command-R internet recovery feature in Lion and managed to it to start up so I can open Utlilities and see if there are issues with the disk. It is showing a 500.11 GB Toshiba MK5065GSXF Media and not a Macintosh HD. I am unable to Verify or Repar Permissions or the Disk as these are grayed out.
Did she lose the hard drive? What are my options here. My wife - after I convinced her to use a Mac - has lost four hard drives in less than a year and is on here second system (the first one was replaced by Apple after she lost three hard drives!)
Any chance this is an issue with File Encyrption? Any suggestions on how to fix this?

5 days after I had recieved my mbp, my harddrive failed as well. I did try to reinstall the OS but with no luck. At some point during installation, it would stop telling me to try again. So I took it to the nearest technical service center and they confirmed the hd-failure and replaced it. this was the 80gig @ 5200rpm. but since you were able to reinstall the OS again, you should be fine. have you run the diskutility again?

Aperture, File Vault, and Time Machine used together?

I am interested to know if I could setup a system to run like this:
1. Create a user account with File Vault turned on
2. Use Aperture inside the File Vault protected profile, thus the Aperture Library is encrypted
3. Plug in an external drive and use Time Machine as normal.
I have heard that in order to use Time Machine and Aperture that one must tell Time Machine to NOT backup the Aperture library. However, if File Vault is used doesn't Time Machine only backup the encrypted volume upon logout?
Can anyone foresee this causing problems? Thanks!

Time Machine and File Vault aren't a particularly good combination.
See #25 in [Time Machine - Frequently Asked Questions|http://web.me.com/pondini/Time_Machine/FAQ.html] (or use the link in *User Tips* at the top of this forum), for details and some possible alternatives.

Imac/imovie/Lacie-file vault seems to be deleted. Am I screwed?

Hello all,
I was editing a movie in iMac, but when I went to finalize the project, it told me I didn't have enough memory. I checked and re-checked and I could not find what was using it up. My movie/photos etc totaled a litte over 100 gigs out of 1 TB. I downloaded a couple of programs to see what was taking up the space but finally found out that 719 gigs was being used by a huge file called "bands." I deleted the file and now when I try to log in I am told that file vault cannot log me in at this time. I have been trying for two days to log in. I was connected to Lacie 6TB but upon disconnecting the size of the file did not decrease.
Am I screwed? Are there any solutions? Apple refuses to even acknowledge my mail, so I assume this is a problem they don't want to hear about. Any help would be greatly appreciated.
Matthew D. Heines
www.heinessight.com

Thak you.
I am running Mountain Lion and I have a 3.4 GHz intel Core i7
That means your model is "27-in Mid-2011 iMac." If you add that to your profile and select OS 10.8, you should get faster help because people don't have to ask you a question before they can answer.
I'm asking the Hosts to move you into the forum for current iMacs. The one you found is for pre-2006 iMacs and gets less traffic. Not your fault--the labeling here is bad and confusing
You may also want to review the MAc OS 10.8 forums here:
OS X Mountain Lion
to see if missing space is happening to others.

File Vault Question!

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