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WITE32 Release Notes Version 3.20

The differences between the old and the new dialog boxes are highlighted and enumerated by the reference

numbers. The following sections describe the modifications in order of increasing the reference numbers.

4.5.1 Relaxing Frequency Limitations

The frequency of the overwriting signal (formerly called the High Frequency or HF signal) no longer needs to be

higher than the frequency of the signal it overwrites (original signal, formerly called the Low Frequency or LF

signal).

The titles of the frequency control panels changed from High Freq. Pattern and Low Freq. Pattern to Overwrite

with and Signal Frequency (refer to reference numbers 1 and 2). Similarly, the names of the frequency sweep

options were changed from Fix High Freq. and Fix Low Freq. to Fix Overwriting Freq. and Fix Signal Freq

(refer to reference number 3).

The text boxes in the frequency control panels no longer impose the frequency comparison limitation. The values

in the text boxes in the Density Ratio panel may be greater than 1.

4.5.2 Noise Correction of Original and Overwritten Signals

In WITE32 versions prior to the version 3.20 the noise correction was performed for overwritten signal when

Subtract noise check box was selected (refer to Figure 28, reference number 4):

noverwrittenoisenoverwrittecorrectednoverwritte

TAATAATAA

−=

Here

TAA

overwritten corrected

is the amplitude of the overwritten signal used in the Overwrite computations,

TAA

overwritten

is the amplitude of the overwritten signal measured on the original signal frequency and

TAA

noise,overwritten

is the amplitude measured on the erased and overwritten track on the original signal frequency.

This correction is still performed in WITE32 version 3.20 if Subtract Noise from the Overwritten Signal check

box is checked (refer to Figure 29, reference number 4).

WITE32 version 3.20 adds noise correction for the original signal:

noiseoriginalcorrectedoriginal

TAATAATAA −=

Here

TAA

original,corrected

is the amplitude of the original (non-overwritten) signal used in the Overwrite

computations,

TAA

original

is the measured amplitude of the original signal and TAA

noise,verwritten

is the amplitude

measured on the erased on the original signal frequency.

This correction is performed if Subtract Noise from the Original Signal check box is checked (refer to Figure 29,

reference number 4).

4.5.3 System Erase as Trimming Mode Option

In WITE32 versions prior to 3.20 track trimming in the Alternative Overwrite test was performed only by

positive erase if Enable Trimming check box was selected (refer to Figure 28, reference number 5). In WITE32

version 3.20 the Trimming mode combo box offers four options (refer to Figure 29, reference number 5):

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