More than 3 revolutions in an .scp file?

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exidyboy
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More than 3 revolutions in an .scp file?

Post by exidyboy »

When exporting .scp files from Kryoflux .raw Preservation Streams it seems that only 3 revolutions are exported?
I would like to check whether that is in fact the case and if more could be included ie Kryoflux by default captures 5 revolutions

Jeff
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Re: More than 3 revolutions in an .scp file?

Post by Jeff »

exidyboy wrote:
Sun Mar 20, 2022 9:51 pm
When exporting .scp files from Kryoflux .raw Preservation Streams it seems that only 3 revolutions are exported?
I would like to check whether that is in fact the case and if more could be included ie Kryoflux by default captures 5 revolutions
please try the latest beta version.

exidyboy
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Re: More than 3 revolutions in an .scp file?

Post by exidyboy »

Jeff wrote:
Wed Mar 23, 2022 12:25 am
exidyboy wrote:
Sun Mar 20, 2022 9:51 pm
When exporting .scp files from Kryoflux .raw Preservation Streams it seems that only 3 revolutions are exported?
I would like to check whether that is in fact the case and if more could be included ie Kryoflux by default captures 5 revolutions
please try the latest beta version.
That was done with 2.5.10.1 which still appears to be the latest beta version.

The 6th byte of the .scp created with beta version 2.5.10.1 reads "03" indicating only 3 revolutions rather than 5.

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Re: More than 3 revolutions in an .scp file?

Post by Jeff »

How many revolutions are present into these raw files ?

exidyboy
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Re: More than 3 revolutions in an .scp file?

Post by exidyboy »

Jeff wrote:
Thu Mar 24, 2022 11:24 pm
How many revolutions are present into these raw files ?
In this case the Kryoflux default value of five although you can, and sometimes often have to, do many more with stubborn disks.

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Re: More than 3 revolutions in an .scp file?

Post by Jeff »

exidyboy wrote:
Fri Mar 25, 2022 10:38 am
Jeff wrote:
Thu Mar 24, 2022 11:24 pm
How many revolutions are present into these raw files ?
In this case the Kryoflux default value of five although you can, and sometimes often have to, do many more with stubborn disks.
Increase the "SCPEXPORT_NUMBER_OF_REVOLUTIONS" variable value.

exidyboy
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Re: More than 3 revolutions in an .scp file?

Post by exidyboy »

Thanks Jeff I wasn't aware of that Internal Parameter. I can see that the .scp header respects the number of revolutions specified although the downstream tool I am using after that does not find the fifth revolution. Are you aware of a third party tool that can verify the number of revolutions actually present in any .scp file rathe than just reading the header?

I tried the Supercard Pro utility itself but received timeout and .dll errors.

exidyboy
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Re: More than 3 revolutions in an .scp file?

Post by exidyboy »

Hi Jeff,

Kryoflux team have confirmed that there are definitely 5 full revolutions in my preservation stream source files (the tracks contain 6 index timing marks) so there might be an issue with the export function to .scp format.

Cheers,
Michael

exidyboy
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Re: More than 3 revolutions in an .scp file?

Post by exidyboy »

and another data point with the latest beta "The resulting SCP file did have 5 revolutions specified in the file header, however the Track Header Data table in the SCP file only has 4 pointers to flux data, the fifth one is zero indicating the track does not exist. "

Full tech details here courtesy Mark:
http://www.osiweb.org/osiforum/viewtopi ... 4312#p4312

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Re: More than 3 revolutions in an .scp file?

Post by Jeff »

OSI low level format isn't supported by the hxc tools.

And maybe you should share the kf raw files too ?

exidyboy
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Re: More than 3 revolutions in an .scp file?

Post by exidyboy »

Jeff wrote:
Fri Apr 15, 2022 10:36 pm
OSI low level format isn't supported by the hxc tools.
Correct. HxC tools are being used to convert .raw to .scp which is supported by downstream tooling developed by the OSI community.
Jeff wrote:
Fri Apr 15, 2022 10:36 pm
And maybe you should share the kf raw files too ?
https://osiweb.org/t/rabble7.zip

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Re: More than 3 revolutions in an .scp file?

Post by Jeff »

Yes some index are outside from the stream.
anyway i have implemented a workaround for such cases :

https://hxc2001.com/download/floppy_dri ... t_beta.zip

This appears to work properly now. (you still need to tweak SCPEXPORT_NUMBER_OF_REVOLUTIONS to 5)

btw is there a low level OSI track/sector format description somewhere ? I might implement the OSI support.

exidyboy
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Re: More than 3 revolutions in an .scp file?

Post by exidyboy »

Jeff wrote:
Sun Apr 17, 2022 4:49 pm

Yes some index are outside from the stream.
anyway i have implemented a workaround for such cases :

https://hxc2001.com/download/floppy_dri ... t_beta.zip

This appears to work properly now. (you still need to tweak SCPEXPORT_NUMBER_OF_REVOLUTIONS to 5)
Yes I can now interrogate the fifth revolution. That's great thankyou. This was worth the effort as this fifth revolution happens to offer error-free reads of three tracks that had errors on every other revolution and should enable at least one more file from this disk to be preserved.
Jeff wrote:
Sun Apr 17, 2022 4:49 pm
btw is there a low level OSI track/sector format description somewhere ? I might implement the OSI support.
There is some discussion and links to archival information on the format in this old thread viewtopic.php?t=1284 as a starting point. Mark is the guru when it comes to the format. His site is here http://osi.marks-lab.com/ and he has been helping me in this thread to document a workflow for imaging Ohio Scientific format floppies when the starting point is a Kryoflux preservation stream dump https://osiweb.org/osiforum/viewtopic.php?f=3&t=717

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