@mja @p @Moon @meso for a lot of applications they kinda suck because you gotta navigate through the whole thing to find a node, rather than being able to start at the end or doing a binary search or whatever.

Singly linked nodes are one way that inode blocks can be arranged - that is, parts of a file. Each part of a file links to the next part. (Though usually it's a list of pointers to blocks)