Start up disk is full - help needed please

There are a few things you can do to free up space on your startup disk. 1. Empty your trash. When you delete a file in the finder, it is stored in the trash so you could recover it if you needed to. If you have files that you know you don't want, you can delete them permanently by pressing command shift delete anywhere in the finder, or select empty trash from the finder menu in the menu bar. Same for iPhoto. Even when you delete a picture from your iPhoto library, it goes into a trash so you could recover it. Emptying this will give you some space. 2. Find what files are taking the most space. To do this, press command F in the finder. In the popup menu labeled, "Kind," select, "Other," then select, "File size." Click Ok, and set your desired criteria. The files should show up in what looks like a file folder. 3. Compress large files. Select a file in the Finder and select file>compress. 4. Clean trace files. While an app can be moved to the trash, files associated with that app may still be present. Typically, these files are small, but they can build up over time. You can find these files in your library folders hidden in your home folder, on your drive labeled, "Macintosh HD," by default, or in Macintosh HD>System. Caution, only remove files you are certain are associated with an app you've removed. These locations also contain important system files which should not be modified. There are also apps like Appdelete that will remove these files intelligently and automatically. 5. Clean build up files like caches or logs. These can be found in the library folders of your computer. Simply open the folder and press command A to select all, then move them to the trash. Empty your trash and restart your computer, and they're all cleaned out. You can also use apps like OnyX which will intelligently and automatically remove build up files.

Here is one way to quickly lose space on a hard drive. Have you ever downloaded some voices to test them, decided you really don't want them after all and deleted them? Well, the voice databases are still sitting there. To remove them, you need to access the folder /system/library/speech/voices. You can delete any folder .speechvoice corresponding to a voice you deleted. Caution: don't delete the voices labeled compact, as they are needed for your computer to handle other languages. If you are lost, just contact me and I'll write a script to make this easier.

Recently, I constantly got “Startup Disk is full” even when I removed some large files. After I checked all my photos, music and movies, I started to suspect Microsoft Outlook, for I had problems with it in the beginning. I tried to find Outlook file directory of Outlook and could not find the directory nor my personal mail file (pst files). So I played around and went to Tools\Run Schedule\Empty Deleted Items Folder, and tried to permanently delete all deleted messages. I was a little concerned when it took about 10 minutes to complete, and has obviously cleaned up multiple folders.

When it’s done, I have emptied trash can and shutdown my MacBook Air (Yosemite). When restarted, I was so pleased I got 28GB of my 128GB system Disk storage back.

i couldn't complete the finding of large files, i found where to put kind, but not the full size selection, i have a macbook is there a different way to do it

Sort by size with cmd control 6. You will see all the folders in there that are big. If you use clean my mac all you do is select the file sizein the pop up thing. I think I have about 300 mb and bigger selected. then you hit scan.

Good luck.

Download Disk Inventory X. This will let you see and remove what's taking up space. I used this to free I kid you not, about 50 gig of stuff I didn't need.

how much does that app cost?