Why isn't 36 GB enough space to store 50 MB of data?

My iMac has an 80 GB hard drive and Finder says there's 36.54 GB available. I tried to export 100 photos (~500 KB each) from iPhoto to a folder under Documents and the software said I didn't have enough disk space to perform the operation. It tried exporting a few at a time and it let me export for a while before I got the same message. I then deleted some unneeded files, emptied the trash and then I was able to export the rest. The implication appears to be that the usable portion of my hard drive is virtually full even though Finder says there's 36+ GB available. What's going on? Any ideas out there? Do I need to use Disk Utility to Verify Disk?
I accessed the UNIX prompt from Terminal and entered the UNIX command 'df -k' to get info about disk usage. It echoed what Finder reports:
/dev/disk0s3 has 80GB, 42GB used, 38GB available, disk 52% full.
Here's a summary of my disk usage (as reported by Finder):
-- Applications folder 6.08 GB
-- Library folder 3.25 GB
-- System folder 1.02 GB
-- Users folder 28.17 GB
(and a few other top level folders with almost nothing in them)
All work is done in one user account (I created a second user account for emergencies, but it's never used and is close to empty) and it's largest folders are:
-- Documents 1.27 GB
-- Music 24.00 GB
-- Pictures 2.32 GB

It looks as though you have a good handle on what's on your drive. You could try using OmniDiskSweeper to see if there is a hidden folder on your machine that is taken up all the space. My other question is, how do you know your pictures are only taking up 500K per picture? Maybe they are taking up more space than expected. Not really sure but those are my guesses, HTH.
-NifflerX

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I have iCloud for my iPhone, my daughters iphone and 2 of my ipads and have purchased the max amount of storage I can but still get a message saying i don't have enough space to store anymore. Do I need to put each device on their own account?

adkennon wrote:
And maybe you don't talk to too many people but I've been on many forums on different websites where people have had similar problems and a lot of people in the store were having battery problems where they were draining too fast. What I learned is that all the people who did not download the updates are good. There phone is working the same. The people who have, they're having battery problems
I have downloaded every update and my battery life is better than any previous iPhone I have ever owned. I see posts from hundreds of people every day, and this is not a commonly reported problem. While there are a few random reports of battery problems, it is no more than I have seen for any other model or any other version of iOS in almost 8 years. Usually problems of rapid battery drain can be traced to bad apps (FaceBook is the worst offender) or corrupt data being synced from iCloud or other sources (gmail, Windows Live, Yahoo, etc).
The simple test is to restore the phone as New. Do not create any email accounts. Do not install any apps. Do not enable FaceTime or iMessage. Do not enable Twitter or any other social networking app. Use it for a day and check the battery usage. You will find that it is working well.
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thank you for your time

Apple doesn't read these forums, which are user supported. Try the 'Contact Us' link below.

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Are you using iCloud photo library beta.
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waiting ..

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.

I have found tones of documentation that stays that it indeed compatible, so...
So ignore the Apple support people.
They make loads of mistakes regarding compatibility and are likely the last people that you should ask.
Also, when Apple discontinues a product, or, release a new product, they don't always list compatibility of older parts with newer machines. Also, they don't test the parts, so they don't say that the parts are compatible with new machines.
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http://www.nvidia.com/object/product_quadro_fx_4800_for_mac_us.html
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"Not enough space" DatabaseException while using DatabaseEnvironment

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Thank you for visiting Apple Support Communities.
When receiving the not enough space alert, he is the best article to go through.
iOS: "Not enough free space" alert when trying to sync
http://support.apple.com/kb/ts1503
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rabidrabbit wrote:
Can I back up my iPhone 4S to my ipad 3 (64 gb)?
no
rabidrabbit wrote:
However, now I don't have enough space in iCloud to backup either device. Why not?
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Why isn't 36 GB enough space to store 50 MB of data?

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