What are those round CD cases called?

They're called clamshell cases. Can you see why?

Generically, the round, polypropylene cases are called clamshell cases.

What should church CD labels look like?

The best advice I can give you is to make sure you include important information about your church (street address, worship times, phone number, Web address) right on the disc label. The sad truth is that CD packaging gets lost. The CD is sometimes passed to friends and acquaintances without the original packaging. So, if you don't have that important info on the disc, the person listening to your CD may not know how to reach you.

Besides that, there are hundreds – if not thousands – of options available to you. Some churches choose to include a picture of their pastor on the label. Others choose to use an image of the church building or worshippers. Still others choose a more symbolic representation of their services: candles or praying hands.

An excellent resource of inspiration or feedback of your designs is the Church Marketing Lab on Flickr. The Church Marketing Lab grew out of the peer review section from the blog Church Marketing Sucks and is organized by the nonprofit Center for Church Communication.

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What does WORM mean?

WORM = Write Once, Read Many.

WORM stands for Write Once, Read Many.  It means your data storage can be written to once (not edited or saved "over") but you can read from it multiple times. This is a valuable feature for archiving because you can't accidentally erase something and no one can tamper with the existing files.

What is Blu-ray packaging?

Blu-ray cases are characterized by their electric-blue, semi-transparent color and unique size.

Typically, when we talk about Blu-ray packaging, we're talking about the electric-blue, transparent, polypropylene case with the standard dimensions of 5-5/16" X 6-3/4" X 1/2" (135 mm X 172 mm X 12.5 mm). Most Blu-ray cases also have the Blu-ray logo embossed, etched or printed in the top center of the case.

What is a "tamper evident seal"?

A tamper evident seal is an opening that allows you to determine if someone has opened the package. For example, Polyline carries adhesive-backed disc sleeves with tamper evident seals.

What type of plastic is used in CDs?

The plastic used in CDs, DVDs and even Blu-ray discs is polycarbonate: the same plastic used in prescription eyeglass lenses. It's an unbelievably strong and lightweight plastic. (Seriously, they actually make bullet proof windows out of this stuff!)

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Why are two different capacities listed on LTO packages?

The first capacity listed (the one on the left) is the native capacity. This is how much data the tape holds with no data compression. The second number is for compressed data (assuming 2:1 compression).

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Why does a CD case look different than a DVD case?

Jewel Cases were designed with the intent of setting the CD product apart from its predecessors (LP and cassettes). The DVD case was designed to help ease the transition from VHS to DVD.

I think it probably comes down to a marketing decision during the design phase. The Philips product development teams in Germany and the Netherlands had decided that the ideal CD case would be not much thicker than the CD itself, would protect the disc from scratches and had to reinforce the image of a state-of-the art product. They wanted something that would look completely different than LP packaging.