Adobe After Effects - Manual (Page 651)

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with limitations regarding inadequate RAM to hold or render a single frame of your composition.
For the best performance with disk caching, select a folder that’s on a different physical hard disk than your source footage. If possible, the folder
should be on a hard disk that uses a different drive controller than the disk that contains your source footage. A fast hard drive or SSD with as
much space allocated as possible is recommended for the disk cache folder. The disk cache folder can’t be the root folder of the hard disk.
As with the RAM cache, After Effects only uses the disk cache to store a frame if it’s faster to retrieve a frame from the cache than to rerender the
frame.
The Maximum Disk Cache Size setting specifies the number of gigabytes of hard disk space to use. In After Effects CS6, the default disk cache
size is set to 10% of the volume's total size, up to 100 GB. In After Effects CS5.5, this amount is 20 GB, by default. Because of this, many more
frames are eligible for disk caching than in previous versions.
In After Effects CS5.5, the application checks to make sure that you have 10 GB free above what is set in Preferences > Media & Disk
Cache. After Effects warns you if there is not enough room for the disk cache.
Roto Brush frames are not persistently cached.
Media cache
When After Effects imports video and audio in some formats, it processes and caches versions of these items that it can readily access when
generating previews. Imported audio files are each conformed to a new .cfa file, and MPEG files are indexed to a new .mpgindex file. The media
cache greatly improves performance for previews, because the video and audio items are not reprocessed for each preview.
When you first import a file, you may experience a delay while the media is being processed and cached.
A database retains links to each of the cached media files. This media cache database is shared with Adobe Media Encoder, Premiere Pro,
Encore, Soundbooth, so each of these applications can each read from and write to the same set of cached media files (Note: Adobe Audition
CS5.5 does not share the media cache database). If you change the location of the database from within any of these applications, the location is
updated for the other applications, too. Each application can use its own cache folder, but the same database keeps track of them all.
Choose Edit > Preferences > Media & Disk Cache (Windows) or After Effects > Preferences > Media & Disk Cache (Mac OS), and do one of
the following:
Click one of the Choose Folder buttons to change the location of the media cache database or the media cache itself.
Click Clean Database & Cache to remove conformed and indexed files from the cache and to remove their entries from the database.
This command only removes files associated with footage items for which the source file is no longer available.
Before clicking the Clean Database & Cache button, make sure that any storage devices that contain your currently used source
media are connected to your computer. If footage is determined to be missing because the storage device on which it is located is not
connected, the associated files in the media cache will be removed. This removal results in the need to reconform or re-index the footage
when you attempt to use the footage later.
Cleaning the database and cache with the Clean Database & Cache button does not remove files that are associated with footage items for
which the source files are still available. To manually remove conformed files and index files, navigate to the media cache folder and delete the
files. The location of the media cache folder is shown in the Conformed Media Cache preferences. If the path is truncated, click the Choose
Folder button to show the path.
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