How do I access Disk Utility for 10.7.1?

How do I access Disk Utility for 10.7.1? I found it in the forums a few weeks ago, used it, then lost the directions. This is a last ditch attempt
to use OS Lion. I parted my hair incorrectly when I installed and have been plagued by the dread rainbow spinning ball in EVERY application. Yes, every. Name one, Safari, Firefox, Text Edit, Mail, Excel, Word, iTunes, Garage Band, Calculator, Calender, iPhoto....yes, every, and I cannot
find a solution that works. I have back up files on two different hard drives 500 gig and 1 terrabyte with all my music, photo and writing files.
I am a writer and a musician so imagine the frustration. OS 10.6 is an option of course. My dedication to Apple and each new OS is deep so
I am hoping that somehow there will a fix, an upgrade, something that does not require me to go bac to the much more endangered species named OS.
hahhaa! Just stalled waiting for the ball to finish with it's random spinning.... SO, this is like a last desperate .... it just did two more stalls.
NO OTHER apps running, just little Firefox holding on for dear life, last desperate request for a fix.
MacKeeper has been great in sending helpful directions for getting the Antivirus to work after it mysteriously decided to stop working, Quite MacKeeper, go to Activity Monitor, force quit helper, start up MacKeeper and run program. It works!
SO before my third stall stops me, please post directions to open disk utility in administration mode so that I can do any further repairs that have not worked by using it from the open system. Also keychain synching stopped working with Lion.
Thanks to any and all who can help.

Press and hold Command-R keys and reboot. You'll then start up in the Lion Recovery HD. You'll find Disk Utility there.
Command-R to the rescue.
Just hold down Command-R during startup and Lion Recovery springs into action. It lets you choose from common utilities: You can run Disk Utility to check or repair your hard drive, erase your hard drive and reinstall a fresh copy of Lion, or restore your Mac from a Time Machine backup. You can even use Safari to get help from Apple Support online. And if Lion Recovery encounters problems, it will automatically connect to Apple over the Internet.

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In this topic I'm not interested in security or data remanence (for such things we can turn to e.g. Wilders Security Forums).
I'm interested solely in best practice approaches to dealing with bad blocks on hard disks.
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@MrHoffman
As well pointed your answers are, you are not answering the original question, and regarding consumer device hard drives your answers are missleading.
Consumer device hard drives ONLY remap a bad sector on write. That means regardless how many spare capacity the drive has, it will NEVER remap the sector. That means you ALWAYS have a bad file containing a bad sector.
In other words YOU would throw away an otherwise fully functional drive. That might be reasonable in a big enterprise where it is cheaper to replace the drive and let the RAID system take care of it.
However on an iMac or MacBook (Pro) an ordinary user can not replace the drive himself, so on top of the drive costs he has to pay the repair bill (for a drive that likely STILL is in perfect shape, except for the one 'not yet' remaped bad block)
You simply miss the point that the drive can have still one million good reserve blocks, but will never remap the affected block in a particular email or particular song or particular calendar. So as soon as the file affected is READ the machine hangs, all other processes more or less hang at the same moment they try to perform I/O because the process trying to read the bad block is blocking in the kernal. This happens regardless how many free reserve blocks you have, as the bad block never gets reallocated, unless it is written to it. And your email program wont rewrite an email that is 4 years old for you ... because it is not programmed to realize a certain file needs to be rewritten to get rid of a bad block.
@Graham Perrin
You are similar stubborn in not realizing that your original question is awnsered.
A bad block gets remapped on write.
So obviously it happens at the first write.
How do you come to the strange idea that writing several times makes a difference? How do you come to the strange idea that the bytes you write make a difference? Suppose block 1234 is bad. And the blocks 100,000,000 to 100,000,999 are reserve blocks. When you write '********' to block 1234 the hard drive (firmware) will remap it to e.g. 100,000,101. All subsequent writes will go to the same NEW block. So why do you ask if doing it several times will 'improve' this? After all the awnsers here you should have realized: your question makes no sense as soon as you have understood how remapping works (is supposed to work). And no: it does not matter if you write a sequence od zeros, of '0's or of '1's or of 1s or of your social security number or just 'help me I'm hold prisoner in a software forum'.
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Writing zeros into the bad block basically only helps if you don't care that the affected file is corrupted afterwards. E.g. in case of a movie the player might crash after trying to display the affected area. E.g. if you know the affected file is a text file, it would make more sense to write a bunch of '-' signs, as they are readable while zero bytes are not (a text file is not supposed to contain zero bytes)
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what is the function of disk utility under application? can someone tell me how to use it?

The hatter wrote:
It is used to format drives, repair permission, and has some ability to repair disk errors, though most go with Disk Warrior.
I think thats a very brief summary of what DU can do, and I'd advise you to check the OSX Help for more DU usages. I'd write that DU can also: repair start-up disk, get info on a disk or volume, create a RAID HD array, SMART-based diagnostic for HD failure, transfer or back-up data as a disk image, burn a CD or DVD, protect info on removable media, see contents on disk image, erase and secure erase a disk/volume... etc
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HT203176 Unable to boot from System disk to access Disk Utility

Hello
I need want to run Disk utilities on my mac. Have done this before using system disk and holding C etc.
Since upgrading to Snow Leopard from Leopard it no longer sees my system disk.
Restart holding down C with system disk installed...and mac just boots-up normally!
Can anyone suggest what the problem is?
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Hi chaps
You get the picture....holding down the C key expecting to see the install software option and all I was getting was my desktop. I tried the option key and no joy there either. I was beginning to think it was the two Mac superdrives installed in my mac which are a nightmare. They only seem to be able to read mac disks!!! all a bit incestuous. I found out via the forums that the Sony DVD RW DW-D150A have taken up a lot of airtime. Still pondering what I can do about them...they were fine and the 2nd drive has never really been used. Apparently they are a rebadged NEC burner but they suddenly decided to get choosey about what disks to read....anyway sorry I am losing focus.
Stuck the Snow Leopard disk and instead of restarting or holding C I just clicked on the desktop icon and pressed the install 10.6 button. It huffed and puffed and chugged away turning my screen blue and then grey and finally coming up with a box with two options...install 10.6 or Utilities. Pressed utilities and I was in familiar ground...Disk First Aid!!!! Ran the verifications and repair buttons and a few fixes and job done....a healthy report on the state of my HD.
To be fair the small booklet does say... to install Snow Leopard insert your installation disc and double-click install Mac OSX. I guess I am so used to using previous versions of the OS and pressing C etc hat I did not realise I could access the utilities/First Aid the same way. Took the best part of my day to do this and if they had put in a 3rd paragraph in the booklet to say access Utilites/First Aid the same way my life would have been a whole lot easier.
Now scared to upgrade to Lion as I really am not enjoying the mac experience at the moment....too much depends on my mac and software working without having to worry about technicalities or IT. It’s just not my bag. Thanks guys for the suggestions and your time. I am interested on your opinions with regards to the two superdrives! I have stuff on old DVDs and it just doesn’t see them but it used to...why? My fault for buying two of the buggers I suppose.
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