Start up disk appears full

The hard drive on my iMac (250 GB) appears to be nearly full, but I know that there is (was) only about 80GB used. Is there a way to see what is taking so much space? I don't see anything in the hard drive folder (if I add up all the items there, I get about 65GB in total).

Use a tool like [OmniDiskSweeper|http://www.omnigroup.com/applications/omnidisksweeper> or [GrandPerspective|http://grandperspectiv.sourceforge.net> to see what's taking up all the space. Don't delete anything you're unsure of without checking here first, though.

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My start up disk is full, and now i cant access my user areas, just a blank screen appears. Any ideas ?

My Start up disk is full, as it keeps telling me, and now i can't access my user areas. just a blank screen after logging in.
any Ideas. I've tried connecting to my Mac desk top, with a thunderbolt cable but nothing happened.

Try this.
1. Start up in Safe Mode.
    http://support.apple.com/kb/PH11212
2. Empty Trash.
    http://support.apple.com/kb/PH10677
3. Delete "Recovered Messages", if any.
    Hold the option key down and click "Go" menu in the Finder menu bar.
    Select "Library" from the dropdown.
    Library > Mail > V2 > Mailboxes
    Delete "Recovered Messages", if any.
    Empty Trash. Restart.
4. Repair Disk
    Steps 1 through 7
    http://support.apple.com/kb/PH5836

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
The first step in dealing with a startup failure is to secure the data. If you want to preserve the contents of the startup drive, and you don't already have at least one current backup, you must try to back up now, before you do anything else. It may or may not be possible. If you don't care about the data that has changed since the last backup, you can skip this step.
There are several ways to back up a Mac that is unable to start. You need an external hard drive to hold the backup data.
a. Start up from the Recovery partition, or from a local Time Machine backup volume (option key at startup.) When the OS X Utilities screen appears, launch Disk Utility and follow the instructions in this support article, under “Instructions for backing up to an external hard disk via Disk Utility.” The article refers to starting up from a DVD, but the procedure in Recovery mode is the same. You don't need a DVD if you're running OS X 10.7 or later.
b. If Step 1a fails because of disk errors, and no other Mac is available, then you may be able to salvage some of your files by copying them in the Finder. If you already have an external drive with OS X installed, start up from it. Otherwise, if you have Internet access, follow the instructions on this page to prepare the external drive and install OS X on it. You'll use the Recovery installer, rather than downloading it from the App Store.
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.
d. If the internal drive of the non-working Mac is user-replaceable, remove it and mount it in an external enclosure or drive dock. Use another Mac to copy the data.
Step 2
You might be able to start up in safe mode even though you can't start up normally. Otherwise, start up from an external drive, or else use the technique in Step 1b, 1c, or 1d to mount the internal drive and delete some files. According to Apple documentation, you need at least 9 GB of available space on the startup volume (as shown in the Finder Info window) for normal operation.

Start up disk is full in my iMac

my imac is 500GB and it says start up disk is full, so i deleted most of unwanted things in my imac. when i press Command + I on my home folder it says i used 170GB but when i press Command + I on the MAC HD icon in desktop it says 0 bytes free! My trash is empty. i'm using MAC OS 10.8. can some one help me

Be sure you Empty the Trash after you put files into the Trash.
It's probable that your drive's directory is corrupt as a result of running out of disk space. You will need to repair the hard drive after you have freed up enough space.
Repair the Hard Drive
Boot from your Leopard Installer disc. After the installer loads select your language and click on the Continue button. When the menu bar appears select Disk Utility from the Utilities menu. After DU loads select your hard drive entry (mfgr.'s ID and drive size) from the the left side list. In the DU status area you will see an entry for the S.M.A.R.T. status of the hard drive. If it does not say "Verified" then the hard drive is failing or failed. (SMART status is not reported on external Firewire or USB drives.) If the drive is "Verified" then select your OS X volume from the list on the left (sub-entry below the drive entry,) click on the First Aid tab, then click on the Repair Disk button. If DU reports any errors that have been fixed, then re-run Repair Disk until no errors are reported. If no errors are reported, then quit DU and return to the installer.
If DU reports errors it cannot fix, then you will need Disk Warrior and/or Tech Tool Pro to repair the drive. If you don't have either of them or if neither of them can fix the drive, then you will need to reformat the drive and reinstall OS X.

Mac Air says start up disk is full

MMac air says start up disk is full & now won't turn on. What can I do?

Step 1
The first step in dealing with a startup failure is to secure the data. If you want to preserve the contents of the startup drive, and you don't already have at least one current backup, you must try to back up now, before you do anything else. It may or may not be possible. If you don't care about the data that has changed since the last backup, you can skip this step.
There are several ways to back up a Mac that is unable to start. You need an external hard drive to hold the backup data.
a. Start up from the Recovery partition, or from a local Time Machine backup volume (option key at startup.) When the OS X Utilities screen appears, launch Disk Utility and follow the instructions in this support article, under “Instructions for backing up to an external hard disk via Disk Utility.” The article refers to starting up from a DVD, but the procedure in Recovery mode is the same. You don't need a DVD if you're running OS X 10.7 or later.
b. If Step 1a fails because of disk errors, and no other Mac is available, then you may be able to salvage some of your files by copying them in the Finder. If you already have an external drive with OS X installed, start up from it. Otherwise, if you have Internet access, follow the instructions on this page to prepare the external drive and install OS X on it. You'll use the Recovery installer, rather than downloading it from the App Store.
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.
d. If the internal drive of the non-working Mac is user-replaceable, remove it and mount it in an external enclosure or drive dock. Use another Mac to copy the data.
Step 2
You might be able to start up in safe mode even though you can't start up normally. Otherwise, start up from an external drive, or else use the technique in Step 1b, 1c, or 1d to mount the internal drive and delete some files. According to Apple documentation, you need at least 9 GB of available space on the startup volume (as shown in the Finder Info window) for normal operation.

My start up disk is full and the now the mac will not start

How do I get on my computer when my start up disk is full?

If you don't have a recent backup, then all your files will be lost.
Clean Install of Snow Leopard
     1. Boot the computer using the Snow Leopard Installer Disc or the Disc 1 that came
         with your computer. Insert the disc into the optical drive and restart the computer.
         After the chime press and hold down the "C" key. Release the key when you see
         a small spinning gear appear below the dark gray Apple logo.
     2. After the installer loads select your language and click on the Continue
         button. When the menu bar appears select Disk Utility from the Utilities menu.
         After DU loads select the hard drive entry from the left side list (mfgr.'s ID and drive
         size.) Click on the Partition tab in the DU main window. Set the number of
         partitions to one (1) from the Partitions drop down menu, click on Options button
         and select GUID, click on OK, then set the format type to MacOS Extended
         (Journaled, if supported), then click on the Apply button.
     3. When the formatting has completed quit DU and return to the installer. Proceed
         with the OS X installation and follow the directions included with the installer.
     4. When the installation has completed your computer will Restart into the Setup
         Assistant. Be sure you configure your initial admin account with the exact same
         username and password that you used on your old drive. After you finish Setup
         Assistant will complete the installation after which you will be running a fresh
         install of OS X. You can now begin the update process by opening Software
         Update and installing all recommended updates to bring your installation current.
Download and install Mac OS X 10.6.8 Update Combo v1.1.

I have an iMac 5.1 with Mac OSX 10.6.8 and 2 GB memory and an L2 cache of 4 GB. lately I have been receiving error messages of " start up disk almost full; please delete files." is the start up disk the same thing as the hard drive?

I have an iMac 5.1 with Mac OSX 10.6.8 and 2 GB memory and an L2 cache of 4 GB. lately I have been receiving error messages of " start up disk almost full; please delete files." is the start up disk the same thing as the hard drive? I opened the hard drive and from the column on the left of the menu I've selected "search for" and under that " all images" then "all documents" I've deleted a few files from each. Are documents and images that I have deleted from here also deleted from the folders on my desktop?

You should never, EVER let a conputer hard drive get completely full, EVER!
With Macs and OS X, you shouldn't let the hard drive get below 15 GBs or less of free data space.
If it does, it's time for some hard drive housecleaning.
Follow some of my tips for cleaning out, deleting and archiving data from your Mac's internal hard drive.
Have you emptied your iMac's Trash icon in the Dock?
If you use iPhoto, iPhoto has its own trash that needs to be emptied, also.
If you store images in other locations other than iPhoto, then you will have to weed through these to determine what to archive and what to delete.
If you use Apple Mail app, Apple Mail also has its own trash area that needs to be emptied, too!
Delete any old or no longer needed emails and/or archive to disc, flash drives or external hard drive, older emails you want to save.
Delete any other mail in your Junk folders. Also, look through your Sent Mail to see if there is anything that can be deleted.
Other things you can do to gain space.
Once you have around 15 GBs regained, do a search, download and install OmniDisk Sweeper.
This app will help you locate files that you can move/archive and/or delete from your system.
STAY AWAY FROM DELETING ANY FILES FROM OS X SYSTEM FOLDER!
Look through your Documents folder and delete any type of old useless type files like "Read Me" type files.
Again, archive to disc, flash drives, ext. hard drives or delete any old documents you no longer use or immediately need.
Look in your Applications folder, if you have applications you haven't used in a long time, if the app doesn't have a dedicated uninstaller, then you can simply drag it into the OS X Trash icon. IF the application has an uninstaller app, then use it to completely delete the app from your Mac.
Download an app called OnyX for your version of OS X.
When you install and launch it, let it do its initial automatic tests, then go to the cleaning and maintenance tabs and run the maintenance tabs that let OnyX clean out all web browser cache files, web browser histories, system cache files, delete old error log files.
Typically, iTunes and iPhoto libraries are the biggest users of HD space.
move these files/data off of your internal drive to the external hard drive and deleted off of the internal hard drive.
If you have any other large folders of personal data or projects, these should be archived or moved, also, to the optical discs, flash drives or external hard drive and then either archived to disc and/or deleted off your internal hard drive.
Good Luck!

I can't download anything as it keeps telling me my start up disk is full. I have deleted loads of files and it still keeps popping up with the same messge??

Please help - I am not too computer savvi and my computer keeps telling me my start up disk is full. I have purchased a passport and transferred loads of images and files onto that and then deleted them from my computer but the message is still the same and I can't download anything.

How big is your hard drive, and how much space is used/free?
To find out, click once on the hard drive icon on your desktop to highlight it (it will be called Macintosh HD unless you renamed it). Click the command and I keys on your keyboard to open the information window. In "General", you will see Capacity and Available. What are those figures?
If you have a little bit of space left, I recommend that you install Omnidisksweeper (it's free) to tell you what folders are using up the most room.
Be careful when you transfer files - only move files that you know are yours. Don't move or delete any system files unless you're specifically recommended to do so (some files are safe to delete; some are not).
Matt

I am having problems gettting my mail to work ... Mac telling me that my start up disk id full and to delete some files to free up space ... have done this but when i open mail from the dock it just brings up the colour wheel and nothing happening

I am having problems gettting my mail to work ... Mac telling me that my start up disk id full and to delete some files to free up space ... have done this but when i open mail from the dock it just brings up the colour wheel and nothing happening ... it shows when you right click on the mail icon that " application not responding"

If your hard drive is getting full, you need to free up, at least, 20 GBs of space on your iMac's hard drive.
If your Mac is running a fairly recent version of OS X, here are some general guidelines.
Follow some of my tips for cleaning out, deleting and archiving data from your Mac's internal hard drive.
Have you emptied your iMac's Trash icon in the Dock?
If you use iPhoto, iPhoto has its own trash that needs to be emptied, also.
If you use Apple Mail app, Apple Mail also has its own trash area that needs to be emptied, too!
Other things you can do to gain space.
Delete any old or no longer needed emails and/or archive to disc, flash drives or external hard drive, older emails you want to save.
Look through your Documents folder and delete any type of old useless type files like "Read Me" type files.
Again, archive to disc, flash drives, ext. hard drives or delete any old documents you no longer use or immediately need.
Download an app called OnyX for your version of OS X.
When you install and launch it, let it run the automatic ans S.M,A.R.T. tests, then go to the cleaning and maintenance tabs and run the tabs that have the ability to clean out all web browser cache files, web browser histories, system cache files, delete old error log files.
Typically, iTunes and iPhoto libraries are the biggest users of HD space.
move these files/data off of your internal drive to the external hard drive and deleted off of the internal hard drive.
If you have any other large folders of personal data or projects, these should be archived or moved, also, to the optical discs, flash drives or external hard drive and then either archived to disc and/or deleted off your internal hard drive.
Good Luck!

I keep getting an error message stating 'my start up disk is full'

Hello. I am a new mac user with a macbook with 120 gb. I was copying my itunes over to my mac from my ipod when I got the message 'start up disk is full' I am not sure if I understand..how can my disk be full when I just purchased my computer and don't really have anything on it. How can I fix this and why is it happening? Surely, I don't need more memory.
I really would appreciate any advice.
thank you,
Lena
macbook Mac OS X (10.4.9)

Download this and scan your hard drive. It will show you what exactly is take up all the space.
WhatSize >>
-Bmer
Mac Owners Support Group
Join Us @ MacOSG.com
iTunes: MacOSG Podcast
 An Apple User Group 
Note: I receive no compensation for product endorsements.

I keep on getting message that my start up disk is full. How do i resolve this?

i keep on getting message that my start up disk is full. How do i resolve this?

Move items you don't need on it, such as the iTunes and iPhoto libraries, to another drive, verify they work in the new location, and then delete them from the internal drive. If you don't need something at all, drag it to the Trash and empty it.
(91713)

My start up disk is full and I need to move my files to an external hard drive, how do i do so?

My start up disk is full and i need to move my files to an external hard drive, how do i do so?

Ensure that the external is correctly formatted
Drag and dropped the files
Test to be sure that the moved files work
Once the moved files work delete the originals
Allan

My start up disk is full, and i can no longer log in to my username to remedy it. i am abroad and my coverage is about to expire. what to do?

My start up disk is full, and I can no longer access my username to remedy it or remove files. I can only access the guest user profile in safari only mode. I am currently overseas and my coverage expired the day this problem happened. sos what do i do? i need to access iphoto and itunes. and everything else I have

My start up disk is full, and I can no longer access my username to remedy it or remove files. I can only access the guest user profile in safari only mode. I am currently overseas and my coverage expired the day this problem happened. sos what do i do? i need to access iphoto and itunes. and everything else I have

I have a mid 2007 iMac.    2 GHz Intel Core 2 Duo, 4 GB 667MHz DDR2 SDRAM, OSX 10.9.5.   I attempted to do the latest update and got the message: Start up disk is full. Delete files. How do I do that?

I have a mid 2007 iMac.    2 GHz Intel Core 2 Duo, 4 GB 667MHz DDR2 SDRAM, OSX 10.9.5.   I attempted to do the latest update and got the message: Start up disk is full. Delete files. How do I do that?

Freeing Up Space on The Hard Drive
1. See Lion/Mountain Lion/Mavericks' Storage Display.
2. You can remove data from your Home folder except for the /Home/Library/ folder.
3. Visit The XLab FAQs and read the FAQ on freeing up space on your hard drive.
4. Get an external hard drive on which to store some of your files after which you can
      erase the data from your internal drive to free up space.
5. Also see Freeing space on your Mac OS X startup disk.
6. See Where did my Disk Space go?.
7. See The Storage Display.
You must Empty the Trash in order to recover the space they occupied on the hard drive.
You should consider replacing the drive with a larger one. Check out OWC for drives, tutorials, and toolkits.
Try using OmniDiskSweeper 1.8 or GrandPerspective to search your drive for large files and where they are located.

Macbook air won't turn on and the screen will go white. It says that the start up disk is full. HELP

When I turn my macbook air on it sends me a message saying that my start up disk is full and that I have to free up some space. When I log in into my account the screen will go white and I won't be able to do anything. I tried to restart my computer in safemode holding down the shift key while restarting it but it won't work. HELP PLEASE.

If you could boot from an external OS X boot drive then you could delete some files. You probably don't have such a HDD/Thumb drive but a Genius at an Apple Store or an Apple Authorized Service Provider could help you. This is not a hardware repair so a Genius should not need to charge you for this service.
Genius reservation http://www.apple.com/retail/geniusbar/ .
or find an Apple Authorized Service Provider https://locate.apple.com/country
After it is healthy again I would buy a new external HDD and use Carbon Copy Clone or Super Duper! to create a bootable clone. Keeping a clone current is also an excellent backup methodology in addition to Time Machine.
Commonly used backup methods:
https://discussions.apple.com/docs/DOC-3045
Methodology to protect your data. Backups vs. Archives. Long-term data protection

Start up disk appears full

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