My computer says startup disk is full but it isn't. Is there a fix?

I'm getting a message saying my startup disk is full, and I need to delete files. However, I'm only using about 15% of my hard drive (macbook is less than a year old). Any suggestions what might be going on?

How do you know you're only using 15% of the hard drive?
There could be a number of things going on. In the first instance, I'd run Applications/Utilities/Disk Utility and use it to run Verify Disk.
Bob

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Error message says startup disk is full but I have 611 GB available on HD?

Keep getting message that the startup disk is full. Checked and have 611GB available on the HD. Help!

"...When I look at the get info screen it says 24mb left..."
What did you do a get info on?

I keep getting a message "Your startup disk is full" but it isn't

I keep getting a message "Your startup disk is full" and my space on the HD fluctuates every second. I have 113 Gbs of free space, but it disappears within seconds and reappears again and repeats.

Yes you should back it up.
Do you have the OS 10.6 disk? You will need it. If you don't have it, you can get one here:
http://store.apple.com/us/product/MC573/mac-os-x-106-snow-leopard
The repair disk procedure does not erase anything on the drive. But before you go any further you should back it up.

Error message startup disk is full but it isn't

I have emptied trash, and cleared folders, I have only had the notebook a month, so it really cant have the 675,240 files on it! any ideas??

For information about the Other category in the Storage display, see this support article. If the Storage display seems to be inaccurate, try rebuilding the Spotlight index.
Empty the Trash if you haven't already done so. If you use iPhoto, empty its internal Trash first:
iPhoto ▹ Empty Trash
Do the same in other applications, such as Aperture, that have an internal Trash feature. Then restart the computer. That will temporarily free up some space.
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. You also need enough space left over to allow for growth of the data. There is little or no performance advantage to having more available space than the minimum Apple recommends. Available storage space that you'll never use is wasted space.
When Time Machine backs up a portable Mac, some of the free space will be used to make local snapshots, which are backup copies of recently deleted files. The space occupied by local snapshots is reported as available by the Finder, and should be considered as such. In the Storage display of System Information, local snapshots are shown as Backups. The snapshots are automatically deleted when they expire or when free space falls below a certain level. You ordinarily don't need to, and should not, delete local snapshots yourself. If you followed bad advice to disable local snapshots by running a shell command, you may have ended up with a lot of data in the Other category. Ask for instructions in that case.
See this support article for some simple ways to free up storage space.
You can more effectively use a tool such as OmniDiskSweeper (ODS) or GrandPerspective (GP) to explore the volume and find out what's taking up the space. You can also delete files with it, but don't do that unless you're sure that you know what you're deleting and that all data is safely backed up. That means you have multiple backups, not just one. Note that ODS only works with OS X 10.8 or later. If you're running an older OS version, use GP.
Deleting files inside an iPhoto or Aperture library will corrupt the library. Any changes to a photo library must be made from within the application that created it. The same goes for Mail files.
Proceed further only if the problem isn't solved by the above steps.
ODS or GP can't see the whole filesystem when you run it just by double-clicking; it only sees files that you have permission to read. To see everything, you have to run it as root.
Back up all data now.
If you have more than one user account, make sure you're logged in as an administrator. The administrator account is the one that was created automatically when you first set up the computer.
Install the app you downloaded in the Applications folder as usual. Quit it if it's running.
Triple-click anywhere in the corresponding line of text below on this page to select it, then copy the selected text to the Clipboard by pressing the key combination command-C:
sudo /Applications/OmniDiskSweeper.app/Contents/MacOS/OmniDiskSweeper
sudo /Applications/GrandPerspective.app/Contents/MacOS/GrandPerspective
Launch the built-in Terminal application in any of the following ways:
☞ Enter the first few letters of its name into a Spotlight search. Select it in the results (it should be at the top.)
☞ In the Finder, select Go ▹ Utilities from the menu bar, or press the key combination shift-command-U. The application is in the folder that opens.
☞ Open LaunchPad. Click Utilities, then Terminal in the icon grid.
Paste into the Terminal window by pressing command-V. You'll be prompted for your login password, which won't be displayed when you type it. You may get a one-time warning to be careful. If you see a message that your username "is not in the sudoers file," then you're not logged in as an administrator.
The application window will open, eventually showing all files in all folders, sorted by size. It may take a few minutes for the app to finish scanning.
I don't recommend that you make a habit of doing this. Don't delete anything as root. If something needs to be deleted, make sure you know what it is and how it got there, and then delete it by other, safer, means. When in doubt, leave it alone or ask for guidance.
When you're done with the app, quit it and also quit Terminal.

Startup Disk Almost Full (but it isn't!)

Hello all,
I've had a problem recently with my iBook G4 where I get a warning that my 'start up disk is almost full' every hour or so. The thing is, when I look at the Finder (or the Activity Monitor) it shows I have almost 8 gigs of hard drive free (and usually 200 plus megs of memory.)
I recently was advised that I needed more RAM, as the person thought maybe system resources were taking up my extra memory, so I put in 512. This seemed to make the problem less frequent, but has not stopped it (it was happening multiple times an hour prior to the memory upgrade.) Incidentally, I do keep my firmware updated.
Also, for what it's worth, I try to keep as few applications open as possible--this will happen when I am only running iTunes and Safari.
I suppose it's not the end of the world to have the warning pop up all the time, but it is pretty irritating.
All suggestions welcome.
Thanks,
Ben

Hey Ben!
What size hard drive is inside your iBook?
It's recommended to have 10% free space at minimum and 25% for "optimal" performance.

Its saying startup disk almost full. have no music or photos on computer. how do i clear it up and free up the HD

its saying startup disk almost full. have no music or photos on computer. how do i clear it up and free up the HD

There are some items to the right of these reply boxes,
of them a few are likely to be of help to some extent...
Without knowing which OS X version, advice will be not specific
and to answer three different ways when one of them is correct
is a waste of time.
Is your OS X newer than Lion 10.7.5? IF so different rules apply
to finding out what is free space, where it is, & how to tell if it is.
For systems older than Lion (Snow Leopard, Leopard, Tiger, Panther)
the rules are a little different, since there would not be an Other item
on the hard disk drive which could contain items necessary to the OS
yet not detailed to the user.
And Lion 10.7 has a few hidden files that are hard to locate, and one
of them may have some bearing on the missing space of a HDD.
The items here, mostly for 10.7:
https://discussions.apple.com/message/24954432#24954432
start up disk full, other options:
https://discussions.apple.com/message/11808734#11808734
There are Support articles, you could use Help viewer in the
system, on your computer, to look for results; or use google.
However, avoid the temptation to use a badware such as cleanmymac,
mackeeper, and others that are sources of known trouble to the Mac.
Good luck & happy computing!

It shows startup disk is full but i use just only 350gb of my hd disk from 500gb.

my macbook shows its startup disk is full but i use just 350gb of my 500gb hd.

That pretty clearly shows the drive is full. So first a question: Why do you believe there's an error? How do you know there's only 350 GB in use? Second is to do the following:
Repair the Hard Drive and Permissions - Lion
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 downward pointing arrow button.
Repair
When the recovery menu appears select Disk Utility. 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 click on the Repair Permissions button. When the process is completed, then quit DU and return to the main menu. Select Restart from the Apple menu.
Again, check your drive usage for any changes.

My mac air says " startup disk is full".How to solve ???

My Mac air has a message during starting the computer and says that startup disk if full. In the composition of my hard there are 120 GB used space on other parts, which I have not understand where is these files.

First, empty the Trash if you haven't already done so. Then reboot. That will temporarily free up some space.
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. You also need enough space left over to allow for growth of your data. There is little or no performance advantage to having more available space than the minimum Apple recommends. Available storage space that you'll never use is wasted space.
If you're using Time Machine to back up a portable Mac, some of the available space will be used to make local snapshots, which are backup copies of files you've recently deleted. The space occupied by local snapshots is reported as available by the Finder, and should be considered as such. In the Storage display of System Information, local snapshots are shown as "Backups." The snapshots are automatically deleted when they expire or when free space falls below a certain level. You ordinarily don't need to, and should not, delete local snapshots yourself.
To locate large files, you can use Spotlight. That method may not find large folders that contain a lot of small files.
You can more effectively use a tool such as OmniDiskSweeper (ODS) to explore your volume and find out what's taking up the space. You can also delete files with it, but don't do that unless you're sure that you know what you're deleting and that all data is safely backed up. That means you have multiple backups, not just one.
Deleting files inside an iPhoto or Aperture library will corrupt the library. Any changes to a photo library must be made from within the application that created it. The same goes for Mail files.
Proceed further only if the problem isn't solved by the above steps.
ODS can't see the whole filesystem when you run it just by double-clicking; it only sees files that you have permission to read. To see everything, you have to run it as root.
Back up all data now.
Install ODS in the Applications folder as usual. Quit it if it's running.
Triple-click the line of text below to select it, then copy the selected text to the Clipboard (command-C):sudo /Applications/OmniDiskSweeper.app/Contents/MacOS/OmniDiskSweeper
Launch the Terminal application in any of the following ways:
☞ Enter the first few letters of its name into a Spotlight search. Select it in the results (it should be at the top.)
☞ In the Finder, select Go ▹ Utilities from the menu bar, or press the key combination shift-command-U. The application is in the folder that opens.
☞ Open LaunchPad. Click Utilities, then Terminal in the icon grid.
Paste into the Terminal window (command-V). You'll be prompted for your login password, which won't be displayed when you type it. You may get a one-time warning not to screw up. If you see a message that your username "is not in the sudoers file," then you're not logged in as an administrator.
The application window will open, eventually showing all files in all folders. It may take some minutes for ODS to list all the files.
I don't recommend that you make a habit of doing this. Don't delete anything while running ODS as root. If something needs to be deleted, make sure you know what it is and how it got there, and then delete it by other, safer, means. When in doubt, leave it alone or ask for guidance.
When you're done with ODS, quit it and also quit Terminal.

What can I do when my macbook air says startup disk is full

What can I do and where do I look to offload things when my macbook air says my startup disk is full?
Thanks

Empty the Trash if you haven't already done so. If you use iPhoto, empty its internal Trash first:
iPhoto ▹ Empty Trash
Do the same in other applications, such as Aperture, that have an internal Trash feature. Then restart the computer. That will temporarily free up some space.
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. You also need enough space left over to allow for growth of the data. There is little or no performance advantage to having more available space than the minimum Apple recommends. Available storage space that you'll never use is wasted space.
When Time Machine backs up a portable Mac, some of the free space will be used to make local snapshots, which are backup copies of recently deleted files. The space occupied by local snapshots is reported as available by the Finder, and should be considered as such. In the Storage display of System Information, local snapshots are shown as Backups. The snapshots are automatically deleted when they expire or when free space falls below a certain level. You ordinarily don't need to, and should not, delete local snapshots yourself. If you followed bad advice to disable local snapshots by running a shell command, you may have ended up with a lot of data in the Other category. Ask for instructions in that case.
See this support article for some simple ways to free up storage space.
You can more effectively use a tool such as OmniDiskSweeper (ODS) or GrandPerspective (GP) to explore the volume and find out what's taking up the space. You can also delete files with it, but don't do that unless you're sure that you know what you're deleting and that all data is safely backed up. That means you have multiple backups, not just one. Note that ODS only works with OS X 10.8 or later. If you're running an older OS version, use GP.
Deleting files inside an iPhoto or Aperture library will corrupt the library. Any changes to a photo library must be made from within the application that created it. The same goes for Mail files.
Proceed further only if the problem isn't solved by the above steps.
ODS or GP can't see the whole filesystem when you run it just by double-clicking; it only sees files that you have permission to read. To see everything, you have to run it as root.
Back up all data now.
If you have more than one user account, make sure you're logged in as an administrator. The administrator account is the one that was created automatically when you first set up the computer.
Install the app you downloaded in the Applications folder as usual. Quit it if it's running.
Triple-click anywhere in the corresponding line of text below on this page to select it, then copy the selected text to the Clipboard by pressing the key combination command-C:
sudo /Applications/OmniDiskSweeper.app/Contents/MacOS/OmniDiskSweeper
sudo /Applications/GrandPerspective.app/Contents/MacOS/GrandPerspective
Launch the built-in Terminal application in any of the following ways:
☞ Enter the first few letters of its name into a Spotlight search. Select it in the results (it should be at the top.)
☞ In the Finder, select Go ▹ Utilities from the menu bar, or press the key combination shift-command-U. The application is in the folder that opens.
☞ Open LaunchPad. Click Utilities, then Terminal in the icon grid.
Paste into the Terminal window by pressing command-V. You'll be prompted for your login password, which won't be displayed when you type it. You may get a one-time warning to be careful. If you see a message that your username "is not in the sudoers file," then you're not logged in as an administrator.
The application window will open, eventually showing all files in all folders, sorted by size. It may take a few minutes for the app to finish scanning.
I don't recommend that you make a habit of doing this. Don't delete anything as root. If something needs to be deleted, make sure you know what it is and how it got there, and then delete it by other, safer, means. When in doubt, leave it alone or ask for guidance.
When you're done with the app, quit it and also quit Terminal.

Imovie won't let me save my movie as a file, and it says ''startup disk'' is full!

I made a movie on Imovie and it won't let me download or convert, I don't know what else I can do, and also it says my disk is full, and my macbook is 64 and its impossible, i dont have that much. please help me. I want to save my movie and fix disk because is making my computer slower and doesn't let me save anything because is ''full''. I need to find a way to save the movie complete and as a file and make my computer faster and with it's original memory.
HELP!.

I have the same problem and then some. I movie won't share this particular project, but it also won't save any changes made to it or any other project. At least that's what it started doing, now when I go to even try to make any changes it wigs out and things get scrambled in the Project window and it plays video from another project.
When I create a new project, the Share menu is available, but it won't save changes to that project either. And by that I mean I can put stuff in the project and do whatever, but as soon as I quit and relaunch the application, the project is empty. I did figure out that if I make changes in a new project and immediately share it to the media browser that it will save the changes, but then it messes up my other project even more somehow!
Tried archive and install, deleting plists, reinstalling iMovie and iLife support stuff (twice), repairing permissions, and changing permissions in the project package. Any other ideas?

Error box says startup disk is full?

Keep getting message that startup disk is full? What does that mean?

Hi Yvonne! Hi Tracy!
Which OS you are on? (Go on Apple-Menu top left and "about this mac"). There has been an issue with with 10.7.1
Please update to 10.7.2
To watch the space of your HD I recommend GrandPerspektive
http://grandperspectiv.sourceforge.net/
There is an other tool, which I don't know, but others recommend: "WhatSize"
marek

Startup disk almost full but cannot log on to delete items

when I start up my MacBook air it said "start up disk almost full" but I cannot even log on my act to get to my home screen to attempt to delete stuff... what do 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.

What does it mean when my macbook pro says startup disk is full?

When im on my macbook pro a message keeps poping up that says my startup disk is full.

First, reboot. That will temporarily free up some space. According to Apple documentation, you need at least 9 GB free for normal operation. You also need enough space left over to allow for growth of your data.
Use a tool such as OmniDiskSweeper to explore your volume and find out what's taking up the space.
Proceed further only if the problem hasn't been solved.
ODS can't see the whole filesystem when you run it just by double-clicking; it only sees files that you have permission to read. To really see everything, you have to run it as root.
First, back up all data if you haven't already done so. No matter what happens, you should be able to restore your system to the state it was in at the time of that backup.
Launch the Terminal application in any of the following ways:
☞ Enter the first few letters of its name into a Spotlight search. Select it in the results (it should be at the top.)
☞ In the Finder, select Go ▹ Utilities from the menu bar, or press the key combination shift-command-U. The application is in the folder that opens.
☞ If you’re running Mac OS X 10.7 or later, open LaunchPad. Click Utilities, then Terminal in the page that opens.
After installing ODS in the Applications folder, drag or copy — do not type — the following line into the Terminal window, then press return:
sudo /Applications/OmniDiskSweeper.app/Contents/MacOS/OmniDiskSweeper
You'll be prompted for your login password, which won't be displayed when you type it. You may get a one-time warning not to screw up.
I don't recommend that you make a habit of this. Don't delete anything while running ODS as root. When you're done with it, quit it and also quit Terminal.

MacBook air says startup disk is full

What do you do when it says startup disk is full

Freeing Up Space on The Hard Drive
1. See Lion's 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. Also see Freeing space on your Mac OS X startup disk.
5. See Where did my Disk Space go?.
6. 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.

Why does TimeMachine say the disk is full when it isn't?

Hello!
A lot of my backups recently have been failing because TimeMachine says the disk is full, when that simply isn't true. As of right now, I have 1.18 TB available of
2 TB. Why do my backups fail even when sufficient space is there?
Thank you so much in advance!!!
-Professor AR

This main explanation is here.
OS X Yosemite (10.10)
This is pretty much equivalent to kids talking to each other on tin cans over a wet string.
The TM in Yosemite is also exceedingly bug infested.
The best solution for now..
1. Use ethernet instead of wireless to do backups.
2. If you upgrade installed Yosemite a clean install might improve it.
3. Using local disk (USB drive plugged in for example) can be a huge improvement over networks and wireless.
4. If you continued the backup from the old OS, wipe the TC disk and start over a new TM backup. (you can archive the old one if you want to maintain the history).
5. Use an alternative to TM until apple get their act together.. eg Carbon Copy Cloner or SuperDuper etc.

My computer says startup disk is full but it isn't. Is there a fix?

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