It was only when the design was able to pass strict enterprise-grade Zero Error standard of 400 units surviving 500 hours of the toughest continuous testing without a single error or failure that the drive was manufactured.
And later there was a follow-up memo among themselves, these executives, and in black and white it says: we elect to not pass this information down to the divisions that were actually involved in the design.
These include the increasingly popular 3.5mm pass-through jack (so friends can plug in and share your music), a collapsible design, a detachable part-coiled cable and in-line remote.