Does a greater number of hard drive platter increase the risk of failure?

For example, if you have a 4TB hard drive with one solid 4TB disk (which I do not believe exists yet but that is besides the point), and you have another 4TB hard drive with 4 discs, does the one with 4 discs have a greater chance of failure?

How about 2 platters vs 3 platters? 10 platters? etc.

Answer

Backblaze published one of the biggest real-life studies to life expactancies of hdd´s. I looked up the number of platters and the platter capacity for each of the hdd´s they tested (data in Excel format here). I tested the number of platters vs. age and the capacity per platter vs age. Here are the graphs:

Number of hdd platters vs. expected age

Hdd platter capacity vs. age

My conclusion, (without further statistical testing or conditional probability analysis) is that the number of platters isn't really much of an issue (in this test pupulation), but the platter capacity is. You are better off (in terms of expected age) with more platters and less capacity per platter.

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