Avoiding Head/Disk Damage During Ramp Touch Process or Actuator "Floating"
Original Publication Date: 2002-Oct-26
Included in the Prior Art Database: 2003-Jun-21
In determining the location of ramp touch, the slider can chatter and cause damage to the disk. This can be avoided by monitoring the capacitance between the slider and disk. As the gram load is reduced, the capacitance is decreased. Also, when the actuator is allowed to "float", the capacitance can be monitored to determine if the suspension is touching the ramp, which can result in chattering. The current method may use the actuator current or readback signal. This method is more sensitive than monitoring the actuator current and does not require one to be able to read/write in this area of the disk. 1