Patent ID: 7447015

Claim:
A method comprising: providing a single drive enclosure holding a plurality of disk drives including a first, a second, a third, and a fourth drive positioned in a pattern of disk drives that extends generally from an air-inlet side of the enclosure to an air-outlet side of the enclosure; performing a first conversion of input DC power into a first regulated DC voltage source; performing a second conversion of input DC power into a second regulated DC voltage source; connecting the first regulated DC voltage source to the first drive and the second drive but not to the third drive or the fourth drive; connecting the second regulated DC voltage source to the third drive and the fourth drive but not to the first drive or the second drive; and writing a first portion of a set of data to the first drive and a second portion of the set of data to the second drive and a mirrored copy of the first portion of the set of data to the third drive and a mirrored copy of the second portion of the set of data to the fourth drive such that if either the first or the second conversion of input DC power to the respective first and second voltage source fails then both the first portion and the second portion of the set of data remain available from drives powered by the other non-failing voltage source.