In this article it is said that NetGear has sold 108,876 devices in 2011 and had a 16.4 % share of the market.
Assuming that a NAS device contains three disks on the average and disk attrition rate is 4% per year (that corresponds to the Google data in the article about disk reliability) we get that about 200 disks fail per day. Note that this is only among NAS devices sold in 2011.
Sales of hard drives are at least 600 million per year. On the basis of the same attrition rate we get
600,000,000 * 0.04 / 365 / 24 ~ 2700 disk failures per hour

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