Why are camera files typically prefixed “DSCN” or something similar

I have photos with the same filenames, but it does not matter when you have the photos organised in folders, and preferably through a database system.

I use Adobe Lightroom, and I only move, sort and organise photos through it, and not through the operating system. Filenames are never of concern this way.

Once your photos are tagged or any metadata is changed, I think the MD5 hash will change.

You may want to ask what other photographers do, in the Photography Stack Exchange.

It's Markdown.

From Wikipedia:

Markdown is a lightweight markup language, originally created by John Gruber and Aaron Swartz allowing people "to write using an easy-to-read, easy-to-write plain text format, then convert it to structurally valid XHTML (or HTML)".The language takes many cues from existing conventions for marking up plain text in email.

Markdown files can be stored as .txt, but you'll also find:

• .md
• .mdown
• .markdown

Having these clues as a file extension will let you easily transform these files into others. Markdown makes it very easy to convert these plaintext files into HTML, OpenDocument fiels, PDF, LaTeX or RTF using MultiMarkdown.

_{And, if you haven't noticed yet, StackExchange uses Markdown for formatting, too!}