Start up disk is full

Delete files you do not need. Empty the trash.

Delete emails you do not need. Empty Mail trash.

Right click the startup disk and select Get Info.

What are the numbers for Capacity: and Available: ?

Restart in Safe Mode:

http://support.apple.com/kb/HT1564?viewlocale=en_US

Empty the trash.

Backup:

Run a Time Machine (or other) backup since you are about to delete and move files and you may need to recover from any inadvertent mistakes or decisions.

- Delete all files in the Downloads folder.

Empty the Trash.

- Start iPhoto.

Empty the iPhoto trash.

- Delete "Recovered Messages", if any.

Hold the option key down and click "Go" menu in the Finder menu bar.

Select "Library" from the drop down menu.

Library > Mail > V2 > Mailboxes

Delete "Recovered Messages", if any.

- Empty the Trash.

- Restart.

- Re-index your system disk:

http://support.apple.com/kb/ht2409

- Delete old iTunes Library file backups:

After you have an up-to-date Time Machine backup and you are satisfied that an iTunes update is performing nominally, trash old iTunes Library files with your Home > Music > Previous iTunes Library folder, then empty the Trash.

- Cull iOS device backups:

Apple iOS® device backups are saved in your Home > Library > Application Support > MobileSync > Backup folder. Retain your most recent backups from these devices and delete older backups in the Devices pane of iTunes preferences.

- Delete Mail Downloads:

Attachments are stored with original messages so you can safely delete the files in the Mail Downloads folder.

Start in the Finder.

Hold down the Option Key.

> Go > Pull down to Library

> Mail Downloads

Delete the files in this folder.

Empty trash.

http://www.macworld.com/article/1165698/seven_ways_to_free_up_drive_space.html

Step 2: Delete unused video versions

Step 5: Remove old iOS cruft

—————

Deleting and Offloading files:

Use OmniDiskSweeper find large folders and files to delete or offload. If you are running 10.8 or 10.9 download it from http://www.omnigroup.com/more. If you are running 10.6.8 or 10.7 down it from https://www.macupdate.com/app/mac/7402/omnidisksweeper. Do not touch any system files. Do not offload files onto a Time Machine disk. Do not offload your entire user folder. Do not rely on restoring files from Time Machine; delete only those files you never want to see again. Do delete or offload seldom use folders/files in your user folder. Remember to empty the trash after trashing the files.

To have Time Machine backup your system disk and your external offload disk up onto your Time Machine disk:

 > System Preferences > Time Machine > Options… > Remove the offload HD name from the exclusions list.

From: "Freeing space on your Mac OS X startup disk."

http://www.thexlab.com/faqs/freeingspace.html

- Compress and archive old files.

- Clean up system logs and temporary files.

- Uninstall Mac OS 9.

- Move your iTunes Music folder to another disk or partition.

- Move your iPhoto Library folder to another disk or partition.

(Includes instructions on moving subsets of the libraries.)

Additional references on freeing disk space:

http://pondini.org/OSX/DiskSpace.html

http://www.macmaps.com/diskfull.html

Wow.. I had 63GB listed under other. This helped tremendously.