Floppy Disk Servo System
Original Publication Date: 1985-Feb-01
Included in the Prior Art Database: 2005-Feb-18
There is a desire for greater and greater track densities on floppy disk drives, but the tolerances of the disk and its associated asymmetrical expansion with temperature and humidity changes has made it difficult to achieve at a reasonable cost. The key to higher track density, at least in the foreseeable future, appears to be in the use of a low cost servo. The idea disclosed here is to use the existing head configuration just as it is used today to read, write and "tunnel" erase, but to further utilize the erase heads as track-following servo heads. Fig. 1 shows the gaps and their relationship to the track. The erase heads would have separate coils (see Fig. 2) and would be used as erase heads when the main gap is in the write mode.