In the elliptically named Cost of Storage Often a Poor Justifier for Investment Ferris Research performs a simple comparison of low-cost RAID 5 to what they call medium-cost RAID 5 for backing up corporate messaging systems. The bottom line: costs range from “$1.60 to $22 per Gigabyte”.

Ferris’ point is that users shouldn’t be too quick to assume that disk storage has to be costly, a sentiment seconds. And for backup purposes, using the 25x backup data compression offered by several companies would make it even more affordable.

More and more folks are tumbling to the fact that storage prices could be way lower than they seem to be today. Perhaps someday soon a big storage company that has been fighting “commoditization” will embrace it and drive several competitors into the ground.