Disk-drive enclosure having rows of alternately facing parallel drives to reduce vibration and method
View Patent ↗A system and method for an improved multiple hard-disk-drive data-storage enclosure. Some embodiments position drives in counter-rotating pairs, each simultaneously accessing half the data, such that seek-caused actuator rotational-acceleration vibration cause simultaneous canceling rotational torque. Some embodiments position the edge of a first drive (or drive pair) at an angle to the actuator midpoint of a nearby second drive (or drive pair), such that rotational-acceleration vibration from a seek-caused actuator rotation in the first drive does not cause a rotational movement into the second drive that affects the tracking or seek operation. Some further embodiments position drives in a herringbone pattern to redirect air flow in addition to reducing rotational-acceleration vibration interaction. Other embodiments include a printed wire circuit board mounted to reduce the rotational-acceleration vibration interaction.
1. An apparatus comprising:
a substrate having a plurality of disk-drive connectors including a first, a second, a third, and a fourth disk-drive connector that are adapted to be connected to a first, a second, a third, and a fourth disk drive, respectively;
wherein the first, second, third, and fourth disk drives each have a first major face A and a second opposite major face B, wherein face B includes a circuit card;
wherein the first, second, third, and fourth disk drives each have an actuator, and an axis at a rotational center of mass that is perpendicular to face A;
wherein the first disk-drive connector and second disk-drive connector are positioned at least as close to one another as to other disk drive connectors and positioned relative to one another such that when connected to their respective connectors the first disk drive's major face A and second disk drive's major face A are positioned facing each other, substantially parallel and next to each other;
wherein the second disk-drive connector and third disk-drive connector are positioned at least as close to one another as to other disk drive connectors and positioned relative to one another such that when connected to their respective connectors the second disk drive's major face B and third disk drive's major face B are positioned facing each other, substantially parallel and next to each other; and
wherein the third disk-drive connector and fourth disk-drive connector are positioned at least as close to one another as to other disk drive connectors and positioned relative to one another such that when connected to their respective connectors the third disk drive's major face A and fourth disk drive's major face A are positioned facing each other, substantially parallel and next to each other.
2. The apparatus of claim 1 , further comprising:
a controller coupled to the first disk-drive connector and the second disk drive and configured to drive an actuator of the first disk drive and an actuator of the second disk drive with substantially simultaneous motions that induce counter-rotating forces in the drives relative to one another.
3. The apparatus of claim 1 , further comprising:
an enclosure, wherein the substrate is enclosed within the enclosure and, wherein the apparatus is configured such that when the apparatus is operating, the substrate is oriented horizontally, and the disk drives are oriented vertically.
4. The apparatus of claim 1 , wherein the first disk-drive connector and the second disk-drive connector are positioned parallel and offset from one another in order to substantially align the axes of rotational centers of mass of the first and second drives.
5. The apparatus of claim 1 , wherein the first, second, third, and fourth disk-drive connector are positioned in a first row of disk-drive connectors and wherein the apparatus further comprises a fifth, sixth, seventh, and eighth disk-drive connector positioned in a second row of disk-drive connectors, wherein each one of a plurality of disk-drive connectors in the first row is positioned across from and at a non-parallel angle to a corresponding disk-drive connector in the second row.
6. The apparatus of claim 5 , further comprising a controller that places data striped across the first row and that mirrors the data of the first row to corresponding disk drives and locations on the second row and that performs read splitting between the first row and the second row.
7. The apparatus of claim 1 , further comprising the first and second disk drives and a further plurality of disk drives.
8. A method comprising:
providing a substrate, an enclosure configured to hold the substrate, and a plurality of disk drives including a first disk drive, a second disk drive, a third disk drive, and a fourth disk drive wherein each of the plurality of disk drives has a first major face A and a second opposite major face B, wherein face B includes a circuit card, and each has an axis at a rotational center of mass that is perpendicular to face A; and
connecting the plurality of disk drives to the substrate in a first row such that
the first disk drive's major face A and second disk drive's major face A are positioned facing each other, substantially parallel and at least as close to one another as to any other disk drives;
the second disk drive's major face B and third disk drive's major face B are positioned facing each other, substantially parallel and at least as close to one another as to any other disk drives; and
the third disk drive's major face A and fourth disk drive's major face A are positioned facing each other, substantially parallel and at least as close to one another as to any other disk drives.
9. The method of claim 8 , further comprising:
driving an actuator of the first disk drive and an actuator of the second disk drive with substantially simultaneous motions that induce counter-rotating forces in the drives relative to one another.
10. The method of claim 8 , further comprising:
configuring the enclosure, substrate, and disk drives such that when the disk drives are operating, the substrate is oriented horizontally and the disk drives are oriented vertically.
11. The method of claim 8 , further comprising:
aligning, substantially along a single line, the axes of rotational centers of mass of the first and second drives.
12. The method of claim 8 , wherein the first, second, third, and fourth disk drives are positioned in a first row of disk drives, the method further comprising
providing a fifth, sixth, seventh, and eighth disk drive; and
connecting the fifth, sixth, seventh, and eighth disk drive to the substrate in a second row of disk drives, wherein each one of a plurality of disk drives in the first row is positioned across from and at a non-parallel angle to a corresponding disk drive in the second row.
13. The method of claim 12 , further comprising:
striping data across the first row;
mirroring the data of the first row to corresponding disk drives and locations on the second row; and
splitting read operations between drives in the first row and drives in the second row.
14. An apparatus comprising:
means for holding and connecting to a plurality of disk drives including a first disk drive, a second disk drive, a third disk drive, and a fourth disk drive, wherein each of the plurality of disk drives has a first major face A and a second opposite major face B, wherein face B includes a circuit card, and each has an axis at a rotational center of mass that is perpendicular to face A; and
wherein, when connected to the means for holding and connecting,
the first disk drive's major face A and second disk drive's major face A are positioned facing each other, substantially parallel and at least as close to one another as they are to any other disk drives;
the second disk drive's major face B and third disk drive's major face B are positioned facing each other, substantially parallel and at least as close to one another as they are to any other disk drives; and
the third disk drive's major face A and fourth disk drive's major face A are positioned facing each other, substantially parallel and at least as close to one another as they are to any other disk drives.
15. The apparatus of claim 14 , further comprising:
means for driving an actuator of the first disk drive and an actuator of the second disk drive with substantially simultaneous motions that induce counter-rotating forces in the drives relative to one another.
16. The apparatus of claim 14 , wherein the means for holding and connecting hold the disk drives such that when the disk drives are operating, they are vertically oriented.
17. The apparatus of claim 14 , wherein the means for holding and connecting aligns the axes of rotational centers of mass of the first and second drives substantially along a single line.
18. The apparatus of claim 14 , wherein the first, second, third, and fourth disk drives are positioned in a first row of disk drives, the apparatus further comprising
a fifth, sixth, seventh, and eighth disk drives, wherein the means for holding and connecting holds the fifth, sixth, seventh, and eighth disk drives in a second row of disk drives, wherein each one of a plurality of disk drives in the first row is positioned across from and at a non-parallel angle to a corresponding disk drive in the second row.
19. The method of claim 18 , further comprising:
means for striping data across the first row;
means for mirroring the data of the first row to corresponding disk drives and locations on the second row; and
means for splitting read operations between drives in the first row and drives in the second row.
20. The apparatus of claim 19 , further comprising
means for powering the plurality of disk drives in a fault-tolerant manner.