One time programmable memory devices are disclosed that are programmed using hot carrier induced degradation to alter one or more transistors characteristics. The device comprises a rotatable, flexible, hollow drive shaft having a fluid impermeable wall defining a lumen of the drive shaft and, an abrasive element mounted to a distal end portion of the drive shaft proximal to and spaced away from a distal support element formed at a distal end of the drive shaft. The flow rate of the discharged fluid can be adjusted by opening or closing the cross-sectional area of a flow path formed by the adjacent nozzle vanes. Transmitting control information in this manner enables a plurality of UEs to efficiently receive PDCCHs without collisions. A cache hit rate achieved when the directory data and the file data are alternately read is improved.