So, I had ~3GB free on my local disk and I tried to download a 2GB file. It failed because it said I ran out of disk space. My disk still shows that I have about 400MB free. According to this post (How exactly does MEGA's download work?), it stores the file then copies it(?) but, the path in the answer is relevant to PC and I'm on a Mac.

I have searched for both the name and the filetype and I have scoured the Google Chrome folder in Application Support.

Not only can I not find the file but, now I have even less available space!? Do I really need twice the amount of space and, where do I find this mystery file so I can either use it or delete it?

  • 1
    Try /Users/USERNAME/Library/Application Support/Google/Chrome/Default/File System (source) or ~/Library/Application Support/Google/Chome/Default/Storage/ext/<extension id>/def/File System/ (source)
    – Alex
    Aug 15, 2013 at 8:16
  • The first one worked! Thank you! I added the extension and sure enough the entire file is there. Not sure why it needs to copy it?
    – user45666
    Aug 15, 2013 at 8:36

2 Answers 2



/Users/USERNAME/Library/Application Support/Google/Chrome/Default/File System



~/Library/Application Support/Google/Chrome/Default/Storage/ext/<extension id>/def/File System/



On Windows C:\Users\USERNAME\AppData\Local\Google\Chrome\User Data\Default\File System\

  • 2
    Any source for this? Oct 4, 2014 at 23:05
  • 1
    This is the correct location for Windows. Helped me a ton as Mega didnt automatically save the file I downloaded so I had to hunt for it myself. Note that it just renames the file to 0000000 so you might need to use the expected filesize as an indicator
    – Richard
    Nov 18, 2020 at 22:19

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