A MacRumors reader named IntrinsicMac has noticed from a teardown of photos from Apple's Time Capsule that it is not using a "server-class" hard drive as advertised, but rather a Hitachi Deskstar drive which are considered consumer-grade.
When introduced, Apple described the 500 or 1 TB drive being used within Time Capsule as "server grade", and continues to advertise it as such on the Apple website.
From the Apple website:
Time Capsule is your one place for backing up everything. Its massive 500GB or 1TB server-grade hard drive gives you all the capacity and safety you need. So whether you have 250 songs or 250,000 songs to back up, room is the last thing you’ll run out of. And considering all that storage and protection come packaged in a high-speed Wi-Fi base station starting at $299, data isn’t the only thing you’re saving.
While I doubt that this matters much - Apple doesn't NEED the headache of advertising false claims. Most buyers of this ... and I would venture to say 99.997% of them could care less whether the drive is "server grade" or not.
An Apple spokesperson later clarified the claim but it still doesn't make sense to advertise like this.
[UPDATE] A reader email indicated that Apple is on a small streak of "little white lies" lately:
1) No "server grade" hard drives as advertised
2) No iPhone SDK as advertised at the end of February instead coming out on March 6th
3) Engadget is reporting that Apple's promised 1000 movies available by the end of February for rent is actually slightly less than 800 and it's March 2.
4) And not to beat a dead horse ... but Leopard was late by a few months and still pretty buggy until the most recent 10.5.2 update.