[SI-LIST] Re: common-mode current limit on hard disks

Jan,
Al Wallash has written a number of papers about electrostatic discharge
(ESD), even up to 15-20 feet away, damaging or destroying the read/write
heads for hard disks.  Many of these papers can be downloaded from his
website    http://www.wallash.com/

Some references, from my webpage   
   http://www.r-e-d-inc.com/esd-anno.htm
are:

[689] Himle, Jenny Ariane, "Electrostatic Discharge Considerations for 
      GMR Heads." (download from http://www.wallash.com/jenny.htm)

[690] Himle, Jenny, "Off-track Testing to Evaluate ESD Damage to MR 
      Heads," IEEE Transactions on Magnetics, vol. 32 no. 5, pp. 
      3455-3457, Sept. 1996.

[896] Levit, Larry, and Wallash, Al, "Measurement of the effects of 
      ionizer imbalance and proximity to ground in MR head handling," 
      Journal of Electrostatics, vol. 47 pp. 305-313, 1999.  (download 
      from http://www.ion.com/storage/shared/Elsevier.pdf)

[1385] Wallash, Al, and Wang, Wenwei, "A Study of Diode Protection for 
      Giant Magnetoresistive Recording Heads," Electrical 
      Overstress/Electrostatic Discharge Symposium Proceedings, Orlando, 
      FL, Sept. 28-30, 1999, pp. 385-390.  (download from 
      http://www.wallash.com/diode_gmr.pdf)

[1386] Wallash, A., and Wang, Wenwei, "A study of diode protection for 
      giant magnetoresistive recording heads," Journal of 
      Electrostatics, vol. 49 no. 3-4, pp. 257-267, Aug. 2000.

[1387] Wallash, Albert J. and Hughbanks, Timothy H., "Capacitive 
      Coupling Effects in Spark Gap Devices," Electrical 
      Overstress/Electrostatic Discharge Symposium Proceedings, Las 
      Vegas, NV, Sept. 27-29, 1994, pp. 273-278.

[1388] Wallash, Al, and Smith, Doug, "Damage to Magnetic Recording Heads 
      due to Electromagnetic Interference," 1998 IEEE EMC Symposium 
      Record Volume 2, Denver, CO, Aug. 24-28, 1998, pp. 834-836.

[1389] Wallash, Al, and Smith, Doug, "Electromagnetic Interference (EMI) 
      Damage to Giant Magnetoresistive (GMR) Recording Heads," 
      Electrical Overstress/Electrostatic Discharge Symposium 
      Proceedings, Reno, NV, Oct. 6-8, 1998, pp. 368-374.

[1390] Wallash, Al, and Smith, Doug, "Electromagnetic Interference (EMI) 
      Damage to Giant Magnetoresistive (GMR) Recording Heads."  
      (download from http://www.wallash.com/emidamage.pdf)

[1391] Wallash, Al, "Electrostatic Discharge (ESD) in Magnetic 
      Recording: Past, Present and Future."  (download from 
      http://www.wallash.com/esdpast.pdf)

[1392] Wallash, Albert J., and Kim, Young K., "Electrostatic discharge
      sensitivity of giant magnetoresistive recording heads," Journal of 
      Applied Physics, vol. 81 no. 8 part 2, pp. 4921-4923, Apr. 15, 
      1997.

[1393] Wallash, Albert J., "Electrostatic Modeling and ESD Damage of
      Magnetoresistive Sensors," IEEE Transactions on Magnetics, vol.
      32 no.1, pp. 49-53, Jan. 1996.

[1394] Wallash, Al, "ESD Demonstrations."  (download from
      http://www.wallash.com/SiVa%20ESD%20Demo.pdf)

[1395] Wallash, Albert, Hillman, James, and Wang, Dexin, "ESD Evaluation 
      of Tunneling Magnetoresistive (TMR) Devces," Electrical 
      Overstress/Electrostatic Discharge Symposium Proceedings, Anaheim, 
      CA, Sept. 26-28, 2000, pp. 470-474.

[1396] Wallash, Albert J., Hughbanks, Timothy S., and Voldman, Steven 
      H., "ESD Failure Mechanisms of Inductive and Magnetoresistive 
      Recording Heads," Electrical Overstress/Electrostatic Discharge 
      Symposium Proceedings, Phoenix, AZ, Sept. 12-14, 1995, pp. 
      322-330.

[1397] Wallash, Albert J., Hughbanks, Timothy S., and Voldman, Steven 
      H., "ESD failure mechanisms of inductive and magnetoresistive 
      recording heads," Journal of Electrostatics, vol. 38, pp. 159-173, 
      1996.

[1398] Wallash, Al, "ESD Testing of AMR and GMR Heads: A Comparison of 
      Magnetic Failure Thresholds," Apr. 22, 1998.  (download from
      http://www.wallash.com/esdtestingidema.pdf)

[1399] Wallash, Albert, "ESD Testing of Head Stack Assemblies Used in 
      Magnet Recording Hard Disk Drives," Electrical 
      Overstress/Electrostatic Discharge Symposium Proceedings, Orlando, 
      FL, Sept. 28-30, 1999, pp. 297-301.

[1400] Wallash, Al, "ESD Testing of Head Stack Assemblies with GMR 
      Heads." (download from http://www.wallash.com/hsa_esdtesting.pdf)

[1401] Wallash, Albert, and Honda, Masamitsu, "Field-induced Breakdown 
      ESD Damage of Magnetoresistive Recording Heads," Electrical 
      Overstress/Electrostatic Discharge Symposium Proceedings, Santa 
      Clara, CA, Sept. 1997, pp. 382-385.

[1402] Wallash, Albert, and Honda, Masamitsu, "Field-induced Breakdown 
      ESD Damage of Magnetoresistive Recording Heads." Journal of 
      Electrostatics, vol. 44 no. 3-4, pp. 257-265, Sept. 1998. 
      (download from http://www.wallash.com/fib.pdf)

[1403] Wallash, Albert J., Field-Induced Charged Device Model Testing of
      Magnetoresistive Recording Heads", Electrical 
      Overstress/Electrostatic Discharge Symposium Proceedings, Orlando, 
      FL, Sept. 10-12, 1996, pp. 8-13.

[1404] Wallash, A., and Kim, Young K., "Magnetic Changes in GMR Heads 
      Caused by Electrostatic Discharge," IEEE Transactions on 
      Magnetics, vol. 34 no. 4, pp. 1519-1521, July 1998.

[1405] Wallash, Albert J., and Kim, Young K., "Magnetic Changes in GMR 
      Heads During Electrostatic Discharge Events," The 7th Joint 
      MMM-INTERMAG Conference, San Francisco, CA, Jan. 6-9, 1998, pp. 
      247.

[1406] Wallash, Albert J., "Standardized ESD Test for Magnetoresistive 
      Recording Heads," IEEE Transactions on Magnetics, vol. 33 no. 5, 
      pp. 2911-2913, Sept. 1997.

[1407] Wallash, Al, "Understanding ESD Damage to Magnetoresistive (MR) 
      Recording Heads."  (download from 
      http://www.wallash.com/understa.htm)

[1408] Wallash, Al, "Understanding ESD in Magnetic Recording or ESD 
      Control for Very Sensitive Devices," Electrostatic Discharge 
      Association National Tutorials, Tutorial D, Anaheim, CA, Sept. 24, 
      2000.

[1409] Wallash, Albert, "Zap! Another MR head bites the dust," DATA
      Storage, Jan. 1998.  (download from      
http://ds.pennnet.com/Articles/
      Article_Display.cfm?Section=Archives&Subsection=Display&
      ARTICLE_ID=37855&KEYWORD=Wallash)

Enjoy!
                                        John Barnes
                                        dBi Corporation
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