Abstract: A rotatable mop includes upper and lower rods, as well as a fixing seat sheathed between the upper and lower rods. The fixing seat contains a bolt and a sliding element screwed with the bolt. The sliding element is connected with a grip sheathed at an outer rim of the fixing seat, a bottom of the bolt is a shaft connected with a disc body having mop wool, brush wool or a brush cloth. When using the mop, by sliding up and down the grip along the fixing seat, the sliding element is driven to rotate the bolt clockwise or counterclockwise, such that the disc body rotates along a same direction, thereby constituting brushing to facilitate a cleaning operation. Additionally, a centrifugal force generated by rotation after using the mop spins dry water on the mop wool, brush wool or brush cloth, thereby dehydrating the mop more conveniently.

Abstract: The traditional single pole perpendicular writer has two major problems—insufficient field gradient in the down track direction and adjacent track erasure (ATE) caused by side fringing fields. These problems have been overcome by tapering the main pole and then shielding it on all four sides.

Abstract: In a single vertical pole magnetic writer, flux passing through the return pole can sometimes be strong enough to erase previously recorded data. This problem has been overcome by the addition of a second return pole that is magnetically connected to the conventional return pole for the purpose of collecting leaked flux, thereby preventing it from reaching the underlayer.

Abstract: The traditional single pole perpendicular writer has two major problems—insufficient field gradient in the down track direction and adjacent track erasure (ATE) caused by side fringing fields. These problems have been overcome by tapering the main pole and then shielding it on all four sides.

Abstract: Prior art designs of single pole writers have been limited by premature saturation at the tip. This limits the head field that can be achieved without simultaneously widening the write profile. This problem has bee solved by means of a vertical main pole whose thickness has its conventional value a short distance from the tip but that tapers down to a significantly reduced value as it approaches the tip. A process for manufacturing this tapered tip design is also presented.

Abstract: Conventional perpendicular writers that utilize an extended return pole are subject to large flux leakage. This problem has been reduced in the prior art by adding a downstream shield. This still leaves significant upstream leakage. This has now been eliminated by adding an upstream shield and then connecting the up and downstream shields by means of side shields. The latter need not extend all the way from the downstream to the upstream shield in which case their thickness is increased relative to the full side shields.