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DVDs are approximately 33% of the cost of hard drives per GB. However, DVD read speeds are significantly slower, and write speeds are obviously WAY slower. And they're much less convenient since you need to manually swap a ton if you want to use a lot of space.

Ergo, hard drive enclosures are great. You can boot from them, you can move data between computers quickly.

2.5" USB interface boxes

Since the power pins are in a standard location, these are almost like the SATA docks (i.e. just plug one thing in and go)