Title :
High data rate recording at over 60 Mbytes per second
Author :
Arnett, P. ; Olson, R. ; Cheng, D. ; Klaassen, K. ; van Peppen, J. ; Hsiao, W. ; Lee, E. ; Werner, D. ; Yuan, S.
Author_Institution :
IBM Almaden Res. Center, San Jose, CA, USA
fDate :
9/1/1999 12:00:00 AM
Abstract :
High data rate recording is dependent on the speed of the write driver electronics and the intrinsic head response. The relationship between head response and head design is studied by finite element modeling. The primary parameters studied are head yoke length, head geometry, and number of coil turns. The head designs are tested using an experimental write driver with a 0.9 ns 10-90% risetime. The risetime of the driver is varied from 0.9 to 3.0 ns by adding capacitance at its output. The parametric and BER performance of three different head designs reveal a strong dependence of maximum data rate capability on the head efficiency and response. The best design showed low BER performance for writing to data rates slightly above 60 MB/s while reading at 15 MB/s with a PRML channel using a (0,4,4) run-length-limited code
Keywords :
capacitance; disc drives; driver circuits; finite element analysis; hard discs; magnetic heads; maximum likelihood detection; partial response channels; runlength codes; (0,4,4) run-length-limited code; 0.9 to 3.0 ns; 15 MB/s; 60 MB/s; BER performance; PRML channel; capacitance; coil turns; data rate; disk drives; finite element modeling; geometry; head design; head efficiency; intrinsic head response; write driver electronics; yoke length; Bit error rate; Coils; Disk drives; Disk recording; Driver circuits; Finite element methods; Geometry; Magnetic heads; Testing; Writing;
Journal_Title :
Magnetics, IEEE Transactions on
