SugarConvDsk's .IPF images do not report write splice about greaseweazle HOT 4 OPEN

Similar to #358 the problem is that this IPF does not report the location of the write splice (reported as -1 which means unknown). Greaseweazle currently takes -1 literally, as one bitcell before the index. Unfortunately this IPF reports data across the index, so placing the write splice at the index places it in the middle of that data.

It would be nice if SugarConvDsk could tell us the write splice location but, in absence of that, heuristics similar to #358 will be required. That is, place the splice in a weak area, or end of an NFA, or in a sector gap. In that order.

from greaseweazle.

Is this specific to the example IPF, or generally true for all IPF generated by SugarConvDsk?

Are the verification error(s) on specific track(s), or can errors occur randomly on any track?

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Actually, I can't produce myself other IPF with SugarConvDSK, since this software doesn't want to build on macOS.
Paco didn't provide other examples...

The errors occur on random tracks. Example 1:
gw write /Users/yserra/Downloads/RIT.ipf
IPF Image File:
SPS ID: 0000 (rev 1)
Platform: Amstrad CPC
Created: 0/0/0 00:00:00
Cyls: 0-41 Heads: 0-1
Writing c=0-81:h=0-1
T0.0: Writing Track (Flux: 200.0ms period, 219.9 ms total, Terminate at index)
T0.0: Writing Track (Verify Failure: Retry #1)
T1.0: Writing Track (Flux: 200.0ms period, 220.0 ms total, Terminate at index)
T2.0: Writing Track (Flux: 200.0ms period, 219.9 ms total, Terminate at index)
T3.0: Writing Track (Flux: 200.0ms period, 219.9 ms total, Terminate at index)
T3.0: Writing Track (Verify Failure: Retry #1)
T3.0: Writing Track (Verify Failure: Retry #2)
T3.0: Writing Track (Verify Failure: Retry #3)
** FATAL ERROR:
Failed to verify Track 3.0

Example 2:
gw write /Users/yserra/Downloads/RIT.ipf
IPF Image File:
SPS ID: 0000 (rev 1)
Platform: Amstrad CPC
Created: 0/0/0 00:00:00
Cyls: 0-41 Heads: 0-1
Writing c=0-81:h=0-1
T0.0: Writing Track (Flux: 200.0ms period, 219.9 ms total, Terminate at index)
T0.0: Writing Track (Verify Failure: Retry #1)
T1.0: Writing Track (Flux: 200.0ms period, 220.0 ms total, Terminate at index)
T2.0: Writing Track (Flux: 200.0ms period, 219.9 ms total, Terminate at index)
T2.0: Writing Track (Verify Failure: Retry #1)
T2.0: Writing Track (Verify Failure: Retry #2)
T3.0: Writing Track (Flux: 200.0ms period, 219.9 ms total, Terminate at index)
T4.0: Writing Track (Flux: 200.0ms period, 219.9 ms total, Terminate at index)
T4.0: Writing Track (Verify Failure: Retry #1)
T4.0: Writing Track (Verify Failure: Retry #2)
T4.0: Writing Track (Verify Failure: Retry #3)
** FATAL ERROR:
Failed to verify Track 4.0

The above examples were tried with the same floppy disk, which works for any other writing.
To rule out any possible problems with the 3" drive, these examples were carried out with a 3.5" drive, on a 3.5" floppy disk.

from greaseweazle.

Here's probably another one, from Paco Gonzalez, Knight Force:

Knighta.ipf.zip

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