This disk contains hotwire data taken by Howard Littell as reported in: "An Experimental Investigation of the Three-Dimensional Boundary Layer on a Rotating Disk" Stanford University, Department of Mechanical Engineering Thermosciences Division Report MD-60 (1991). These data were taken with the dual 45 degree probe and the single crosswire probe. The disk is composed of three directories, one each for the three radii at which turbulent data were taken. These are named as R235 for R = 0.235 meters, etc. Each directory contains two files for each Reynolds number investigated. These are named as RE100.XXX for a Reynolds number of 1,000,000 and so on. The file extension denotes whether it contains the mean data: MN or the turbulence quantities: TRB. As described in Appendix F of the report, the turbulent statistics were obtained by the crosswire aligned with the mean flow as found earlier by the dual 45 degree probe. These statistics were collected into tensors and rotated spatially into a Cartesian coordinate system fixed to the disk at the radius of the measurements. The Y axis was taken as normal to the disk, the Z axis was directed towards the axis of rotation, and X axis was tangent to the circumference in the direction opposite the sense of rotation of the disk and the coordinate system. The U and W mean velocities in the crosswire files are actually those obtained with the dual 45 degree probe scaled to the correct local disk speed for the crosswire runs, while the mean V's reported are from the crosswire. The mean velocities used in generating the statistics were those measured by the crosswire. The velocities are given with units of m/s, and the fluctuations are m^2/s^2 or m^3/s^3 as appropriate.