Take the 2-minute tour ×
Super User is a question and answer site for computer enthusiasts and power users. It's 100% free, no registration required.

I have noticed that thumbnails on Mac OS X don't seem to be generated every time I open a folder, but to be somehow "cached" instead.

I wasn't able, however, to find a folder where they clearly look to be stored.

I thought then they could be saved as some kind of metadata; i found, however, that when deleting a file (e.g. from the Desktop) and saving immediately after a file by the same name, the preview for the previous file is showed for ~ a second.

Are they stored separately from data? How and when are they invalidated (e.g. only when a file by the same name appears in the same directory)?

share|improve this question
    
Probably in the infamous .DS_Store file in the same directory. –  Daniel Beck Oct 19 '12 at 15:51
    
I also took this as a possibility, however it doesn't seem to contain anything about the thumbnails. –  Alberto Moriconi Oct 19 '12 at 16:03
add comment

1 Answer

up vote 4 down vote accepted

The quicklookd background process is responsible for creating and managing file thumbnails. Those thumbnails are stored in a folder named com.apple.QuickLook.thumbnailcache in a folder like /var/folders/39/ggldtdps6034ct7d_y6x4_v80000gn/C that is specific to your user account. The file index.sqlite contains a SQLite database with information about stored thumbnails; access it using the sqlite3 command line tool.

share|improve this answer
    
Great! I was able to dump the index.sqlite db, take a look and get an insight of how this works! Thanks :) –  Alberto Moriconi Oct 19 '12 at 17:17
add comment

Your Answer

 
discard

By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.