Delete Files warning

My company updated my computer and reinstalled my Dreamweaver CS6 version12.0. Before, if I was about to delete a file DW would tell me "that file is linked to X page. Do you still want to delete." Now DW no longer advises that and I would like to know how I get it back. Also just noticed that when rename a file, it doesn't update that throughout the site either
Any help would be appreciated.
Chip

Did you redefine your sites within the new installation of DW?
If you don't have the site name in the left hand dropdown of the Files window and Local View in the right hand dropdown, it's possible your new installation doesn't know to update anything.
Without a site definition, DW also would not know which dependant files are linked to your pages. Both issues could be from losing the site definitions after the reinstall.

Similar Messages

WARNING: DATA LOSS - EMET 4 reporter deletes files

NOTE: This EMET issue was moved here from this original post: http://answers.microsoft.com/en-us/windowslive/forum/gallery-wlsettings/photo-gallery-crash-emet-reporter-deletes-file/e5a510c8-e0fb-4d33-8179-8ee7a18d11e5?rtAction=1377879230389
Discovered a bug in EMET 4.0 running on Windows 8 (desktop).
Steps to reproduce:
open a .jpg graphic... opens in Photo Gallery.
hit the "Edit, Organize, or Share" button, top left menu bar.
Program crashes and opens a "Photo Gallery has stopped working"/Close program prompt.
EMET opens up a "Do you want to send more information about this issue?" prompt.
When you click Yes/Send with the EMET prompt it DELETES YOUR FILE - no recycle bin, no warning.
It appears to be a problem with EMET. I closed the Photo Gallery prompt and the program closed, file deletion did not occur until the EMET prompt was sent/closed.
UPDATE: Discovered a new unwanted behavior... it will delete the file when you hit the DONT report button as well. I guess the only way is to close the prompt window and not to choose the REPORT or DON'T REPORT buttons.

NOTE: The below entry describes a problem with the default EMET 4 configuration for Windows Photo Gallery which led to the discovery of this bug. It is taken from (duplicated from) this post... http://answers.microsoft.com/en-us/windowslive/forum/gallery-wlsettings/photo-gallery-crash-emet-reporter-deletes-file/e5a510c8-e0fb-4d33-8179-8ee7a18d11e5
---------------------------->>
I did not reinstall Photo Gallery here (not needed)... I think the problem is with EMET.
With the previous entry, where I was asked to disable EMET and test Photo Gallery, I may not have disabled it fully via the task manager... so I got the expected crash. I just tested with EMET running but with all the mitigation checkboxes unchecked for
WLXPhotoGallery.exe, and I was able to use the "Edit, Organize, or Share" button in Photo Gallery properly with no crash.
I will have to experiment with which EMET mitigation check is causing the crash when using the "Edit, Organize, or Share" button. The default EMET installation list had all mitigation checkboxes checked for this program. If someone happens
to know the proper checkbox configuration for WLXPhotoGallery.exe please post.

What directory/area is needed to delete files when your startup disk is warning it's getting full?

Have the message that the startup disk is near full and I need to delete files. What area or directory will directly clear this issue. I have cleared out trash and deleted files....is there a specific directory that causes this issue. thanks much

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. 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.

BOBJ is unable to delete file from OFRS

System Info:
Business Objects Enterprise XI3.1 SP3 FP3.2
Windows 2003 Server Enterprise Edition SP3
Oracle 10.2
Java 1.6.0_20
APACHE Tomcat 5.5.20
2 clustered servers
FRS located on SAN Disk Drive connected to primary server (Winchester1)
We use WebIntelligence exclusivly.
We are receiving the following error in our event log on our clustered server:
Source: BusinessObjects_CMS
Category: General
Type: Warning
Event ID: 33018
Computer: Winchester2
Unable to delete file from the file repository. Make sure a File Repository Server is running and registered and enabled. Details : Failed to connect to the File Repository Server output. Make sure the server is up and running.
We have verified the FRS is running and we are able to connect to it from our clustered server (Winchester2). The security settings are set to full control for the admin group and the users have Read/Write access to the file store folders. The errors are filling up our event logs and causing issues with the servers. this appears to be happening each morning and the file it is trying to delete is an .xls file.
We have a ticket open with SAP Support but they are just as baffled as we are and keep sending us from one group to another and tell us they need to look at it on thier end and they will get back to us.
Has anyone had this happen on their system?

Hi Richard, did you ever get this issue resolved? We are having a similar issue on XI R3 SP4 using NAS/CIFS shares for our File Stores. We see this issue mainly after our servers are patched and a full environment restart is initiated. Like you, our event logs fill up with so many error messages I cannot pinpoint exactly when the issue starts happening.
Any help would be much appreciated.

Trash cannot delete file in use

I occasionally have troubles deleting files from the Trash because the message says that the files are still in use, even though I haven't got any applications open.
One of the main features that convinced me to upgrade to Snow Leopard was that it would say which application was using the file that was in use. However, since updating, the warning message hasn't changed since Leopard. Is there a preference or something I need to change to get this feature active?

GromReaper wrote:
I occasionally have troubles deleting files from the Trash because the message says that the files are still in use, even though I haven't got any applications open.
One of the main features that convinced me to upgrade to Snow Leopard was that it would say which application was using the file that was in use. However, since updating, the warning message hasn't changed since Leopard. Is there a preference >or something I need to change to get this feature active?
Here is a [read on trash|http://www.thexlab.com/faqs/trash.html] that may help you. And, I don't remember Apple promising the feature your mention. [Read here|http://www.apple.com/macosx/refinements/enhancements-refinements.html].

How do I delete files from the start up disk?

I keep getting the messsage that my start up disk is full and I shoudl delte files, which I have tried to do, by putting stuff inthe trash and emptying it, but that does not seem to be enough and I keep getting the message. ireally don't ahve much stored on my computer except for a lot of photos. Could the photos be the problem?

Empty the Trash if you haven't already done so. If you use iPhoto, empty its internal Trash first:
iPhoto ▹ Empty Trash
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 free 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 on this page 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.

Audit directory and searching through the logs for deleted file

Windows Server 2003
I have found article http://whatevernetworks.com/?p=108
And in description of this article is: to found deleted files in auditing directory I have to found event 560.
But I have about 60 000 events.
My file abcd.txt is missing and I have to find who delete it, but I cant click 60 000 times to find it.
Moreover most of that event looks like its objcect open not object deleted.
How to find this particular?
Event Type:   Success Audit
Event Source:   Security
Event Category:   Object Access
Event ID:   560
Date:       2/23/2014
Time:       11:48:00 PM
User:        DOMAIN\user
Computer:   PLWAW1FS00003
Description:
Object Open:
    Object Server:   Security
    Object Type:   File
    Object Name:   E:\Temp\download.domain.com\example.zip
    Handle ID:   1788
    Operation ID:   {0,477992664}
    Process ID:   1692
    Image File Name:   C:\WINDOWS\system32\xcopy.exe
    Primary User Name:    user
    Primary Domain:    DOMAIN
    Primary Logon ID:   (0x0,0x1C7D2FA0)
    Client User Name:   -
    Client Domain:   -
    Client Logon ID:   -
    Accesses:   DELETE
           READ_CONTROL
           WRITE_DAC
           WRITE_OWNER
           SYNCHRONIZE
           ACCESS_SYS_SEC
           ReadData (or ListDirectory)
           WriteData (or AddFile)
           AppendData (or AddSubdirectory or CreatePipeInstance)
           ReadEA
           WriteEA
           ReadAttributes
           WriteAttributes
    Privileges:   SeBackupPrivilege
           SeRestorePrivilege
    Restricted Sid Count:   0
    Access Mask:   0x11F019F
Find fields are: Information/Warning/Error/Succes/Failure
Event source: DS/IIS/LSA etc...
Event ID:
User:
Computer:
Description:
and no filename, or action.
Maybe I can use powershell to search through the logs?

Hi,
You can use Custom View and XML filter to filter specific event logs. Firstly, create a custom view. Then type an XML query to filter by ObjectName (abcd.txt).
For more detailed information, please refer to the article below:
Advanced XML filtering in the Windows Event Viewer
http://blogs.technet.com/b/askds/archive/2011/09/26/advanced-xml-filtering-in-the-windows-event-viewer.aspx
Regards,
Mandy
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are trying to better understand customer views on social support experience, so your participation in this
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Can't delete files backed up in Time Machine

I use Time Machine to back up my MacBook Pro to NAS on my home wifi. I have a large file in my downloads folder that I have moved elsewhere and I don't need backed up. When I enter Time Machine's 'Star Wars' window and select the file and choose to delete all instances of it from the drop-down from the 'cog' icon in the Time Machine Finder, then I OK the warning that I can't undo the delete. Then - nothing happens! The file remains there! My question is: how does one delete files from Time Machine?
I would be grateful for any suggestions.

... Can anyone recommend a brand of NAS, such as Synology, that works properly with TM backups?
The exhaustive list of devices supported by Time Machine amounts to the following:
AirPort Time Capsule's built-in hard disk (any model)
External USB hard disk drive connected to a Time Capsule (any model)
External USB hard disk drive connected to an AirPort Extreme (current model only)
A hard disk drive directly connected either to the source Mac, or a Mac on your local network.
That is all.
Use whatever backup device you want, but you should be aware that this site is full of reports of misery from hapless individuals who had been using third party NAS devices for Time Machine backups, only to find that they were incomplete, corrupted, or useless in the dire circumstances in which they were required. Apple won't care if you lose your data while using a Time Machine configuration specifically excluded from their technical support documents.

Can't delete files in Bridge CC :-/

I have a problem that has just started. Normally I could always delete files from the HDD in Bridge. Yes, there is the original warning dialog about whether I want to remove the file or delete it, and I chose to delete it so I didn't get the warning message every time. This worked fine from the Stone Age until now. But recently when I try to delete a file, either by right clicking and hitting the delete option, or by hitting Ctrl+Delete, all that happens is that the next file in line is highlighted, leaving the one I wished to delete intact. What gives? I tried resetting warning dialogs and did the whole nine yards, but nothing works. Any suggestions?
TIA

I think it's a cache problem - I was having the same problem (as well as getting cache warnings every time I opened Bridge) - try following the instructions given here. I did and both problems are now resolved

I can't move files or folders or delete files without authentication. Also, it doesn't appear that I can change permissions?

I can't seem to move or delete files or folders on my MacBook Air mountain lion system. It doesn't appear that changing permissions works either? Any ideas?

Back up all data now.
This procedure will unlock all your user files (not system files) and reset their ownership and access-control lists to the default. If you've set special values for those attributes on any of your files, they will be reverted. In that case, either stop here, or be prepared to recreate the settings if necessary. If none of this is meaningful to you, you don't need to worry about it.
Step 1
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.
Drag or copy — do not type — the following line into the Terminal window, then press return:
sudo chflags -R nouchg,nouappnd ~ $TMPDIR.. ; sudo chown -R $UID:20 ~ $_ ; chmod -R -N ~ $_ 2> /dev/null
Be sure to select the whole line by triple-clicking anywhere in it. You'll be prompted for your login password, which won't be displayed when you type it. You may get a one-time warning not to screw up. You don't need to post the warning. If you don’t have a login password, you’ll need to set one before you can run the command.
The command will take a noticeable amount of time to run. Wait for a new line ending in a dollar sign (“$”) to appear, then quit Terminal.
Step 2
Boot into Recovery by holding down the key combination command-R at startup. Release the keys when you see a gray screen with a spinning dial.
When the OS X Utilities screen appears, select Utilities ▹ Terminal from the menu bar. A text window opens.
In the Terminal window, type this:
resetpassword
That's one word with no spaces. Then press return. A Reset Password window opens. You’re not going to reset a password.
Select your boot volume ("Macintosh HD," unless you gave it a different name) if not already selected.
Select your username from the menu labeled Select the user account if not already selected.
Under Reset Home Directory Permissions and ACLs, click the Reset button.
Select  ▹ Restart from the menu bar.

Time Machine Deleted Files From A Non-Full Backup?

OK... I just noticed something strange... I had some movie files that I deleted sometime yesterday (don't need them anymore)... just now, I wanted to see to retrieve one of them with TM and they're gone!
My backup drive is nowhere near full and TM didn't warn me about deleting anything... looking at my backups, I noticed that I only have backups for yesterday at 8:03AM and from 8:09PM (and on)... I'm guessing that's the case because anything before 8:09PM is now more than 24 hrs old... hence, it's 'thinned out'... I also noticed that I only have my initial backup from Friday... not the several it made afterwards... and that backup from Friday is missing some data I had that was captured by the later backups...
What's going on here? Seems to me that it should have all of my stuff, no?

jdelima wrote:
If you have all of the hourly data essentially versioned and incorporated into the daily, then Joe wants to restore from 3 days ago, if he has a file there that he has changed every single hour for that particular day, then he has 24 possible files to restore! It becomes a versioning nightmare. Though my example is extreme it's possible.
Yeah, but that is what computers are good at, though. You can even put a simple UI on this, where the most recent version (the last edited version before its untimely deletion) is the only thing you see, unless you want to delve deeper into the depths of versions of the file.
Also consider what is currently done for backups. People manually, or to a schedule, do point in time backups. Not as frequently as time machine, but it still happens. They have the exact same issues, with the exception that TM may have people becoming relaxed about their data, falsely believing it always going to be in a backup set somewhere.
Yeah, point-in-time backups are always an issue, because they are just a snapshot, and not a journal of things done to change a file, so you can't recover something if it was never in a point-in-time backup.
Sure it has it's flaws, but overall it's better there than not.
I totally agree with that. Getting people to use some backup (even if flawed) is way better than the dismal state of backups for end users. I guess I'm just advocating for improving even further the state of backups, to a point where you can actually rely on them 99.999%.
In case anyone is interested, I have been participating in an Open Source backup project "Box Backup" for the last few years. It supports the keeping of deleted files as long as the backup server has space left. It also solves another TM problem, in that it backs up only what changed in a large file (like a Parallels virtual Disk), so you don't need to do full backups of every file every time it changes. It has many other features as well, such as network backups, encrypted backups, and multiple platform support (Windows, Mac, Linux, and more).
Go to http://www.boxbackup.org/ to check it out.
This, however is not a solution (yet) for the average Joe to use. It requires a server on which to run the backup server (which could be a Mac), and some setup, and use of Terminal.app, etc. But it does solve many of the issues with TM.
Thanks,
Per

I am told that the start-disc of my Mac Air is full and that I have to delete files. What do I do ?

I am told that the start-disc of my Mac Air is full and that I have to delete files. What do I do ?

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 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 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 asBackups. 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. Reboot and it should go away.
See this support article for some simple ways to free up storage space.
You can more effectively use a tool such as OmniDiskSweeper (ODS) 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.
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.
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 ODS in the Applications folder as usual. Quit it if it's running.
Triple-click anywhere in the 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
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 (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 with the largest at the top. It may take a few minutes for ODS to finish scanning.
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.

Nas drive does not recalculating space after deleting files on Nas Drive??

Greetings to Respected expert,
Actually we have configure Window server 20082 Storage server.We have NAS drive configured which have 300GB quota limit. The actual data in the folder is 185 GB but it shows only 15 GB free and shows a warning .Please assist me why NAS server does not re-calculate
the space after deleting files or does not leave space. Pardon me if I am not able to clear you my problems.this is very urgent for me.
Thanks And Regards
Rajnish Singh

Hi Rajnish,
As you mentioned "quota limit", it is set via FSRM or specific function on NAS?
Meanwhile could you confirm the number 185GB is accurate? Sometimes a part of used space is just not calculated. You can confirm with checking the total space on NAS locally.
If the number is correct and quota is set via FSRM, check if it is the Disk Quota which not re-calculated the released space. Try to clear the Quota setting and reconfig with 300GB limitation and see if issue still exists.
If you have any feedback on our support, please send to [email protected]

Deleting files requires administration password?

I'm not sure what settings I've messed around with to get to this point however, any time I now want to delete files it not only requires my administrator password but it bypasses the trash bin and just fully deletes them off of my laptop. It was just a minor annoyance at first, but then I realized as I was deleting mass amounts of music from iTunes that clicking "move to trash" on the files did nothing, the files are still in my music folder and now I have to manually delete and enter my password on the files. It's also stopped uninstalling things due to this issue with the recycle bin. I've checked the safe trash bin/etc checkboxes and toggled them on and off but no go it's still the same issue. Does anyone have any ideas what I might have done to cause this?

Back up all data.
This procedure will unlock all your user files (not system files) and reset their ownership, permissions, and access controls to the default. If you've intentionally set special values for those attributes on any of your files, they will be reverted. In that case, either stop here, or be prepared to recreate the settings if necessary. Do so only after verifying that those settings didn't cause the problem. If none of this is meaningful to you, you don't need to worry about it, but you do need to follow the instructions below.
Step 1
If you have more than one user, and the one in question is not an administrator, then go to Step 2.
Triple-click anywhere in the following line on this page to select it:
sudo find ~ $TMPDIR.. -exec chflags nouchg,nouappnd {} + -exec chown $UID {} + -exec chmod +rw {} + -exec chmod -N {} + -type d -exec chmod +x {} + 2>&-
Copy the selected text to the Clipboard by pressing the key combination command-C.
Launch the built-in Terminal application in any of the following ways:
☞ Enter the first few letters of its name into a Spotlight search. Select it in the results (it should be at the top.)
☞ In the Finder, select Go ▹ Utilities from the menu bar, or press the key combination shift-command-U. The application is in the folder that opens.
☞ Open LaunchPad. Click Utilities, then Terminal in the icon grid.
Paste into the Terminal window by pressing command-V. I've tested these instructions only with the Safari web browser. If you use another browser, you may have to press the return key after pasting.
You'll be prompted for your login password, which won't be displayed when you type it. Type carefully and then press return. You may get a one-time warning to be careful. If you don’t have a login password, you’ll need to set one before you can run the command. If you see a message that your username "is not in the sudoers file," then you're not logged in as an administrator.
The command may take several minutes to run, depending on how many files you have. Wait for a new line ending in a dollar sign ($) to appear, then quit Terminal.
Step 2 (optional)
Take this step only if you have trouble with Step 1, if you prefer not to take it, or if it doesn't solve the problem.
Start up in Recovery mode. When the OS X Utilities screen appears, select
Utilities ▹ Terminal
from the menu bar. A Terminal window will open. In that window, type this:
res
Press the tab key. The partial command you typed will automatically be completed to this:
resetpassword
Press return. A Reset Password window will open. You’re not going to reset a password.
Select your startup volume ("Macintosh HD," unless you gave it a different name) if not already selected.
Select your username from the menu labeled Select the user account if not already selected.
Under Reset Home Directory Permissions and ACLs, click the Reset button.
Select
 ▹ Restart
from the menu bar.

My start up disk is full. How do I delete files from this?

My air is saying my start up disk is full. How do I delete files from it? Is there a specific location I'm supposed to delete from, or is it just general files from everywhere--email, etc.

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. Type carefully and then press return. 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.

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