According to one teardown of Apple's Time Capsule released earlier this week, the hard disk drive inside the wireless base station is a consumer version, not a server-grade disk as advertised by Apple.
From Apple Insider:
From Apple Insider:
French Mac site MacBidouille tore down Apple's fourth-generation Time Capsule. The 2TB Time Capsule received by the publication featured a Western Digital Caviar Green HDD.Teardown of Apple's new Time Capsule reveals consumer, not server, grade HDD
Various publications have noted that the WD Caviar Green model is generally considered consumer class. However, on its website, Apple advertises the Time Capsule as having a "Serial ATA server-grade hard disk drive."