This is a scary message because nobody seems to understand what it means! Apple, in all their ease-of-usefulness, forgot to make this message a little more user-friendly. What this message means in human-speak is that your internal hard drive, which is where all of your data (photos, documents, music, etc.) is stored is now full. Visualize a 5-gallon bucket for a moment. If you fill this bucket to about 90%, a voice will yell at you saying “Hey, you just filled the bucket up to 90%!” Though this doesn’t sound very problematic, since it’s just a bucket and all, it’s actually a HUGE problem if left unchecked.
What can happen when your startup disk, or bucket, is full is that the computer no longer has any room to perform its operations–it’s almost as if the computer is suffocating and has no more air to breathe. When this happens, the computer simply will get to a point that it will no longer startup, or boot in geekspeak.
At this point when you see the “Startup Disk Full” message, you will want to immediately begin to either back up your data to an external hard drive for safe-keeping, or, begin going through your data and deleting older data that you may no longer need. These files will always start with videos and photos, since they take up the most data, and then into music and documents. Thankfully, Capital Mac can help you figure out what is using all of this data and how to get it safe before it’s lost forever.