SLAMorris Final Thesis After Corrections.pdf - Cranfield University

The thumbnail cache itself is a hidden directory named .thumbnails, which
consists of up to 3 files: fail, normal and large; however it is possible for an
application or a user to store other data within the .thumbnails directory
[Ubuntu: Lucid, 2010]. An MD5 hash of the Uniform Resource Identifier (URI) of
the original file provides the unique key by which each entry in the cache is
named. The subdirectory normal, stores standard thumbnail cache records in
the form of PNG images with the metadata embedded within each image
making up the rest of the entry. The normal thumbnail directory contents is
defined to be images up to 128 x 128 in size; large contains thumbnail graphics
up to 256 x 256 pixels in size. The fail directory, contains records which are
faulty, this may be because the generation of the visual thumbnail was
unsuccessful, or due to an error in creating the record.
Figure 5-1: Ubuntu 10.10 and the Nautilus File Manager
The directory .thumbnails can be found in the user’s home directory; therefore
each user account has a single centralised thumbnail cache. The directory is
hidden, and can contain up to three further directories; fail, large and normal.
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