Write back dumped disk

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SomeGuy
Posts: 282
Joined: Wed Feb 18, 2015 8:18 pm

Re: Write back dumped disk

Post by SomeGuy »

Here is a conversion of your newer dump:
http://s000.tinyupload.com/index.php?fi ... 7511977158

Comparing the MFM, between the two, I spotted some minor differences in the data area, so there may have been a read error. (Hard to tell). Did you try writing your new dump back as-is?
pieroandreini
Posts: 40
Joined: Mon Apr 27, 2015 8:45 pm

Re: Write back dumped disk

Post by pieroandreini »

Thank you SomeGuy,

unfortunately, even if now I can write back the raw image, it still doesn't work.

Could it be because the recording format is non-standard? (288 bytes sector etc etc).

I also tried to decode the duplicated floppy with TOOL-2.EXE which, although not finding errors, takes a long time to do its job, and the decoded file is only zeroes. That happen with both raw dump (cleaned and original)

If can be useful here is a tool that decode in txt the raw TI tracks:
https://github.com/ogdenpm/disktools/bl ... ux2imd.exe

here is the dumped floppy made with the cleaned raw data you sent me:
https://www.dropbox.com/s/8qzu9aqdm44pa ... p.zip?dl=0
SomeGuy
Posts: 282
Joined: Wed Feb 18, 2015 8:18 pm

Re: Write back dumped disk

Post by SomeGuy »

What the blazes. What you have read back is not even vaguely what was in the image. If this is right, then your drive is not writing to the target disk at all, and what you read back is the previous contents of the target disk (FM with normal-ish 128 byte sectors).
pieroandreini
Posts: 40
Joined: Mon Apr 27, 2015 8:45 pm

Re: Write back dumped disk

Post by pieroandreini »

Thank you for the tip!!!
I used another the drive and it magically works !!!
Now I will try to clean up the other ten images as well.
I took a look at PFI.EXE, I think that is the utility used, can you tell me the parameters to use?
SomeGuy
Posts: 282
Joined: Wed Feb 18, 2015 8:18 pm

Re: Write back dumped disk

Post by SomeGuy »

Sorry for not responding sooner.

I think the relevant commands I used were:
pfi track00.0.raw disk1.pfi
pfi disk1.pfi -R 1 -r 1000000 -p decode pri disk1.pri
pri disk1.pri -p decode text-mfm image1.txt

This creates a text file containing decoded MFM. There is no checking of sector validity.

Then the following commands create a stream file from an MFM text file:
pri -p encode text image1.txt disk1.pri
pfi -p encode pri disk1.pri disk1.pfi
pfi disk1.pfi track00.0.raw

But there is a bug somewhere, as the kryoflux will think the RAW files are empty. To fix that I open the stream in the latest HxC beta tool and re-save as a stream file.

Although... it almost looks as if running an image through HxC by itself may do something similar to clean noise now. But I don't have time to poke around with that any more.

Anyway, the idea is that eliminating the noise creates an image with the same quality as a freshly mastered disk. Otherwise it's like making a photocopy of a photocopy.
pieroandreini
Posts: 40
Joined: Mon Apr 27, 2015 8:45 pm

Re: Write back dumped disk

Post by pieroandreini »

Thanks so much SomeGuy!!
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