Abstract: A formulation for the care of damaged hair is provided, comprising: a vehicle; a silicone; and a deposition aid, wherein the deposition aid is a cationic dextran polymer, comprising a dextran base polymer functionalized with quaternary ammonium groups; wherein the dextran base polymer has a weight average molecular weight of 50,000 to 3,000,000 Daltons; wherein the quaternary ammonium groups include (i) a quaternary ammonium group of formula (II) bound to a pendent oxygen on the dextran base polymer (ii) a quaternary ammonium group of formula (III) bound to a pendent oxygen on the dextran base polymer wherein is pendent oxygen on the dextran base polymer; wherein X is a divalent linking group; wherein each R2 is independently selected from a C1-4 alkyl group; wherein each R3 is independently selected from a C1-4 alkyl group; and wherein each R4 is independently selected from a C5-20 alkyl group.

Abstract: A hard disk drive spindle synchronization method comprises the steps of: sending an index marker pulse generated within each disk drive to mark in time a beginning of each rotation of the disk spindle thereof to a party line to which all drives are connected, rotating the disk spindle at a slightly different rotational velocity than any other drive of the array, monitoring drive pulses present on the spindle reference party line from other disk drives of the plurality to locate a center of gravity of pulse clusters which is within approximately plus or minus one quarter revolution of the drive's own index marker pulse, upon detection of a said center of gravity, ceasing to rotate the disk spindle at a slightly different rotational velocity during a second phase, adjusting the rotational phase of each drive to converge toward the center of gravity until all drive pulses present on the spindle reference party line converge into a single composite marker pulse present on the spindle reference party line, and mai