Abstract: A valve selectively opens and closes a passageway defined by a port. The valve comprises a body defining outer and inner surfaces; the inner surface defining an inner cavity. A sealing arm extends from the body into the inner cavity and is movable between first and second positions for closing and opening the passageway, respectively. A shape memory alloy member is disposed at least partially along the outer surface and alternates between first and second lengths in de-energized and energized states, respectively. The first length is greater than the second length, which constricts about the body. A leg extends from the body into the inner cavity and is moveable between initial and activated positions in the de-energized and energized states, respectively. The leg engages and moves the sealing arm from the first position to the second position when the leg moves from the initial position to the activated position.

Abstract: A valve selectively opens and closes a passageway defined by a port. The valve comprises a body defining outer and inner surfaces; the inner surface defining an inner cavity. A sealing arm extends from the body into the inner cavity and is movable between first and second positions for closing and opening the passageway, respectively. A shape memory alloy member is disposed at least partially along the outer surface and alternates between first and second lengths in de-energized and energized states, respectively. The first length is greater than the second length, which constricts about the body. A leg extends from the body into the inner cavity and is moveable between initial and activated positions in the de-energized and energized states, respectively. The leg engages and moves the sealing arm from the first position to the second position when the leg moves from the initial position to the activated position.

Abstract: A method and apparatus for reverting a disk drive to an earlier point in time is disclosed. Changes made to the drive are saved in a circular history buffer which includes the old data, the time it was replaced by new data, and the original location of the data. The circular history buffer may also be implemented by saving new data elements into new locations and leaving the old data elements in their original locations. References to the new data elements are mapped to the new location. The disk drive is reverted to an earlier point in time by replacing the new data elements with the original data elements retrieved from the history buffer, or in the case of the other embodiment, reads to the disk are mapped to the old data elements stilled stored in their original locations. The method and apparatus may be implemented as part of an operating system, or as a separate program, or in the controller for the disk drive. The method and apparatus are applicable to other forms of data storage as well.

Abstract: A method and apparatus for reverting a disk drive to an earlier point in time is disclosed. Changes made to the drive are saved in a circular history buffer which includes the old data, the time it was replaced by new data, and the original location of the data. The circular history buffer may also be implemented by saving new data elements into new locations and leaving the old data elements in their original locations. References to the new data elements are mapped to the new location. The disk drive is reverted to an earlier point in time by replacing the new data elements with the original data elements retrieved from the history buffer, or in the case of the other embodiment, reads to the disk are mapped to the old data elements stilled stored in their original locations. The method and apparatus may be implemented as part of an operating system, or as a separate program, or in the controller for the disk drive. The method and apparatus are applicable to other forms of data storage as well.

Abstract: A method and apparatus for reverting a disk drive to an earlier point in time is disclosed. Changes made to the drive are saved in a circular history buffer which includes the old data, the time it was replaced by new data, and the original location of the data. The circular history buffer may also be implemented by saving new data elements into new locations and leaving the old data elements in their original locations. References to the new data elements are mapped to the new location. The disk drive is reverted to an earlier point in time by replacing the new data elements with the original data elements retrieved from the history buffer, or in the case of the other embodiment, reads to the disk are mapped to the old data elements stilled stored in their original locations. The method and apparatus may be implemented as part of an operating system, or as a separate program, or in the controller for the disk drive. The method and apparatus are applicable to other forms of data storage as well.