If these were the original IBM System 360 reels, each reel held 20MB.
Here's the fun part: This image shows 12 rows, each with about 200 reels.
At 20MB per reel, the total storage in this photo is about 4.8GB...
... or half what a $10 flash drive holds today.
Photo source: https://twitter.com/theretronaut/status/462351017246720000
Tape info: http://en.wikipedia.org/wiki/9_track_tape
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