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Cassette tapes also are made as cheaply as possible, and the longer the tape the lower quality it is (as a general rule). I don't consider them data-grade at all. Anything engineered for the purpose of data storage will be vastly higher quality, and will support bit densities far beyond what you can reliably get out of cassettes.

Not all of them are cheap and low quality.

Look at this:

And what they called extreme testing ... They recovered the data from the tested tapes after this mistreatment. The combination of their tapes (metal on mylar, not oxide on acetate) and their technology are, as I said earlier, far more reliable than most tape drive systems.

Hot Coffee Test
First, we wrote two VXAtapes with 100 MegaBytes of data. Then we placed the first tape in a dry beaker. We brewed a fresh pot of coffee, just the same way that our engineering team likes it in the morning: Hot, and strong. Then we poured the coffee right onto the tape, submerging it completely, and leaving it submerged for 30 seconds. ...

Freezing Test
First, we wrote two tapes with 100 MegaBytes of data each. To encase them in the ice, we first poured distilled water² to a depth of three inches into a large, flat container, and froze it overnight in a refrigerator. The next day, we set the tapes flat on top of the ice, covered them in about three inches of distilled water, then replaced the container in the freezer. Twelve hours later, the tapes were frozen solid. ...

Boiling Test
First we wrote two tapes with 100 MegaBytes of data each. For this test, we used distilled² water which we poured into a beaker and brought to a rapid boil. At our altitude, in Boulder, Colorado, this is a temperature of about 96 C. We submerged the tapes in the boiling water. ...
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