Patent ID: 7945419

Claim:
A method of electronically measuring reel off-center run-out and reel hub mismatch, said method comprising: accessing, by a processing device, electronically measured tape speed data related to a tape coupled with an operating drive reel; correlating, by said processing device, said tape speed data with drive reel rotation angles; and translating, by said processing device, correlated tape speed data to drive reel hub radii variations with respect to said drive reel rotation angles, wherein said drive reel hub radii variations comprise an operational measure of reel off-center run-out and reel hub mismatch of said drive reel, wherein said translating correlated tape speed data to drive reel hub radii variations with respect to said drive reel rotation angles comprises: fitting, by said processing device, a sine wave to a set of data comprising average tape speed data which has been correlated with said drive reel rotation angles; and subtracting, by said processing device, amplitude information of said fitted sine wave from elements of said set of data to translate said tape speed data to drive reel hub radii variations with respect to said drive reel rotation angles.