Increasing Space on SSD?

I would trust Disk Utility, just checked mine and its correct.
I've never used MacKeeper, so I don't know whats going on there.
Of course you can also check Activity Monitor under Utilities.

Try DaisyDisk from the App store, you just have to wait a few seconds to use it if you don't buy it, has been very useful for me.
I've learned a lot about where Apple stores stuff on the computer from DaisyDisk.

Here is what it looks like.

I don't know if it would explain 80GB, but I think that Time Machine keeps some backup information on the SSD that can be overwritten if the space is needed. Finder reports the space as available, while Disk Utility reports the space as written.

reispr01 said:

Well - looking at some other posts, I tried something crazy simple. I turned Time Machine off.

ALL of the disk space said to be "gone" is now back. 80+ GB. I have no idea why. I didn't erase anything. I don't know if the data was ever really there, or what it was.

Maybe best not to ask.

Click to expand...

Time Machine saves some backup data on your local hard drive in addition to your backup drive. Don't worry, your backup drive still has all the backup data. It's just that your local drive has some for simple restoration activities.

Ohhh...I understand now.
That kind of happened to me a while ago when I first tried Time Machine.
I still had it on even tho I didn't have my hard drive connected, and after a while it started to store the backups on the computer itself.
Not sure if thats exactly what happened to you, but reminds me of when that happened to me.

reispr01 said:

When I use the Disk Utility to "look" at my SSD, it tells me that I have used 90 GB of the 120 GB available. However, when I look at my programs and other files,.... it appears that I have only used around 10 GB of space.

Click to expand...

For space issues, there are a few things you can try, some of which may or may not apply:

• Begin by restarting your computer as a first step. This sometimes resolves issues.
• For Time Machine users on notebooks running Lion, space may being consumed by Time Machine local snapshots, which can be disabled.
  OS X Lion: About Time Machine's "local snapshots" on portable Macs
• Search with Finder to see if the space is being consumed by a very large file or several large files. Adjust the 50GB in the illustration to whatever size you deem appropriate.
  
• Use OmniDiskSweeper, JDisk Report, Disk Inventory X or GrandPerspective to see how space is being used on your drive. Some of these apps may show more detail than others, so try several.

reispr01 said:

I run a MacKeeper scan

Click to expand...

You don't need "cleaner" or "maintenance" apps like MacKeeper to keep your Mac running well, and some of these apps can do more harm than good. Some remove files/folders or unused languages or architectures, which does nothing more than free up some drive space, with the risk of deleting something important in the process.

These apps will not make your Mac run faster or more efficiently, since having stuff stored on a drive does not impact performance, unless you're running out of drive space. Some of these apps delete caches, which can hurt performance, rather than help it, since more system resources are used and performance suffers while each cache is being rebuilt.

Many of these tasks should only be done selectively to troubleshoot specific problems, not en masse as routine maintenance.

Mac OS X does a good job of taking care of itself, without the need for 3rd party software. Among other things, it has its own maintenance scripts that run silently in the background on a daily, weekly and monthly basis, without user intervention.

My best recommendation is that you uninstall MacKeeper.