I can not delet files as Start up disk is full and I can not open up

My macbook air  do not start up as I can not delite files and  make more rooms for start updisk

Boot to the Recovery HD:
Boot to the Recovery HD:
Restart the computer and after the chime press and hold down the COMMAND and R keys until the menu screen appears. Alternatively, restart the computer and after the chime press and hold down the OPTION key until the boot manager screen appears. Select the Recovery HD and click on the arrow button below the icon.
Connect an external completely erased USB drive to one of the USB ports. Select Disk Utility from the Utility menu and click on the Continue button. Clone your startup volume to the external drive:
Clone using Restore Option of Disk Utility
  1. Select the destination volume from the left side list.
  2. Click on the Restore tab in the DU main window.
  3. Select the destination volume from the left side list and drag
       it to the Destination entry field.
  4. Select the source volume from the left side list and drag it to
      the Source entry field.
  5. Double-check you got it right, then click on the Restore button.
Destination means the external backup drive. Source means the internal startup volume.
When the above is completed you need to erase the internal drive and reinstall OS X.
Install or Reinstall Mavericks or Mountain Lion from Scratch
Be sure you backup your files to an external drive or second internal drive because the following procedure will remove everything from the hard drive.
OS X Mavericks- Erase and reinstall OS X
OS X Mountain Lion- Erase and reinstall OS X
OS X Lion- Erase and reinstall Mac OS X
Note: You will need an active Internet connection. I suggest using Ethernet if possible
            because it is three times faster than wireless.

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    Supposedly one can hold the Shift key down while booting (Safe Mode) and that's supposed to allow one to boot the machine when the startup disk is full.
    Step by Step to fix your Mac
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    Run the following command:
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    Freeing Up Space on The Hard Drive
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    .Create a data recovery/undelete external boot drive

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    Ensure that the external is correctly formatted
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    There is a boot drive inside the computer and it's storage space is filled up.
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    The second drive you connect is going to be your "extra storage drive" basically to free up space off the internal boot drive by transferring files to it.
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    Connect only StorageOne drive and visit your User/Movies folder, it's likely the biggest culprit of oversized files. Create a new folder on the StorageOne drive called "ExtraMovies" and transfer the contents of User/Movies to the "ExtraMovies" folder via drag and drop methods.
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    If you have a large amount of User/Files elsewhere, you will have to search yourself and repeat the same steps to free up room on your internal boot drive.
    Once you have made some free space, download this free program to help you visualize where all your space is being taken up.
    http://grandperspectiv.sourceforge.net/#download
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    Maintain TWO separate hardware copies of your User data at ALL TIMES
    Because you need more room, thus the storage drives are for extra space. The TimeMachine drive is a backup of your internal boot drive and the second storage drive is a backup copy of the first storage drive. So that way your sticking with the rule of thumb, get it?
    Don't connect TimeMachine while your transferring files, or formatting drives, you don't want it to "kick in" while your doing all this heavy work or transferring a large amount of files, I think it does so every hour, which you are going to taking quite some time to do all this work.
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    Reconnect TimeMachine drive
    Then connect the TimeMachine drive and it will make a NEW backup of your now newer configuration on your boot drive and keep it updated every time you connect it.
    Again, TimeMachine is NOT a storage drive for permanent keeping of data, it deletes old stuff as time progresses. So even though you can "go back in time" and recover a file you transferred then deleted off the your internal boot drive, it  won't keep everything forever like a storage drive can.
    Consider Cloning your boot drive.
    TimeMachine drives can only restore, they are not bootable like a clone is, so a TimeMachine drive isn't a heck of a lot of help if your hard drive fails to boot the computer, so a "hold the option key bootable clone" made with third party software is a very useful as you get to use the computer just like it was before and can get online, grab files off the internal drive and so forth. Even erase and reverse cloning!
    The trick with a clone is you make one and keep it disconnected, updating it from time to time. If a software update or install hoses your machine, you can option boot off the clone, grab the latest copy of your files and reverse clone the clone with the updated files back onto your OS X partition, reboot the computer and it's like nothing happened.
    It's a advanced technique, you will have to learn a lot more perhaps before attempting it, but it's a lifesaver.
    Cloning requires another separate external hard drive and free cloning software.
    You can read more about it all here. Take your time, you have a lot to absorb.
    https://discussions.apple.com/message/16276201#16276201

  • I can't login, keep geting "Your  Startup Disk is Full" and asking me to delete file. if I cant login how can I delete files? Please help

    I Keep getting "your startup disk is full" ..... "You need to make more space available on your startup disk by deleting file..."  If I can't have an acess, how can I delete files. Please help..

    That means the hard drive of your computer is full, and you don't have enough free space on your computer, to do what you are trying to do. 
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    - your trash can in the dock
    - if you use iPhoto, your trash in iPhoto - launch iPhoto, and select trash in the left hand column.  iPhoto has it's own trash, and is often overlooked
    - your download folder - finder / home user / downloads - every time you download something, it stores it here. This is often overlooked as well
    - do you have more than one user on the computer?  If you do, ensure they are needed.  If not, delete them, and the contents of their home folders
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    - deleting data off your computer
    - moving data to an external drive - (iPhoto Libraries, iTunes Libraries or iMovie events, as they are the biggest space hogs)

  • My macbook air won't load.  Says start up disk is full but I can't get the home page to open

    My Macbook air won't load.  Says the start up disk is full but won't open the home page so I can do anything about it

    Step 1   
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    c. If you have access to a working Mac, and both it and the non-working Mac have FireWire or Thunderbolt ports, start the non-working Mac in target disk mode. Use the working Mac to copy the data to another drive. This technique won't work with USB, Ethernet, Wi-Fi, or Bluetooth.
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  • HT3275 Time Machine not deleting oldest backups when the disk is full

    Time Machine not deleting oldest backups when the disk is full

    Unfortunately, when this happens, Time Machine cannot erase enough space to create room for the new backup. Your options now are:
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    2) Manually delete backups from Time Machine....which is a long and tedious process.  After a few hours, not much space will be reclaimed and it will not be long before the Time Capsule is full again
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