Bad floppies :(

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Dominus
Posts: 30
Joined: Tue Mar 01, 2016 10:32 am

Re: Bad floppies :(

Post by Dominus » Wed Mar 09, 2016 10:59 am

Quest for a set of good floppies continues...
Now my SilverSeed (Ultima VII - Part2 Add-on) shows *all of the "Side 0" Tracks as "Good + Modified" with some as bad; and almost all of "Side 1" as bad Tracks, some G+M, two as unknown... :(

What does "Modified" mean exactly, the explanation in the manual is not really enlightening?

Dominus
Posts: 30
Joined: Tue Mar 01, 2016 10:32 am

Re: Bad floppies :(

Post by Dominus » Wed Mar 09, 2016 11:12 am

Very odd. My Ultima VIII Speech disks 1+2 read fine but all tracks showed as modified, the third disk showed everything as good (not modified).
And the Ultima VII - Part 1 add-on shows up as bad as the other add-on...

(I'm mostly ranting, I do not expect anyone to fix my disks :))

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IFW
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Joined: Mon Nov 08, 2010 2:42 pm

Re: Bad floppies :(

Post by IFW » Wed Mar 09, 2016 11:38 am

Modified literally means modified (written to), since duplication or formatting.
Can also happen if the duplication method was of poor quality.

Dominus
Posts: 30
Joined: Tue Mar 01, 2016 10:32 am

Re: Bad floppies :(

Post by Dominus » Wed Mar 09, 2016 11:54 am

I think in the case of the add-ons I'd vote for poor quality. Makes no sense for them to be modified afterwards. Would also explain the overall bad shape of these disks.

My Ultima 1 Atari 5 ¼" was in a much better shape: one bad track and one "unknown". But for a 34 years old game, kind of ok :)

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IFW
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Re: Bad floppies :(

Post by IFW » Wed Mar 09, 2016 12:22 pm

Chances are, almost all of your A8 disks are copy-protected, so unknown/bad does not necessarily mean a problem :)
btw: always keep the stream files!

Dominus
Posts: 30
Joined: Tue Mar 01, 2016 10:32 am

Re: Bad floppies :(

Post by Dominus » Wed Mar 09, 2016 12:36 pm

Yes, I'm keeping the stream files for "bad" dumps - but maybe I should reconsider and save all streams :)

Good to be reminded of copy-protection looking like bad tracks, thanks.

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IFW
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Re: Bad floppies :(

Post by IFW » Wed Mar 09, 2016 2:32 pm

Maybe -> definitely, otherwise it's completely useless for preservation if it's an image of a commercially duplicated disk.
On an average disk more than half of all written information gets lost once you transform your disk image into a sector image. Information, that can be used to verify the integrity, authenticity of the disk, not to mention information that almost always holds all the data used by copy-protections.
There is no way of ever getting the information lost back, other than redumping the disk - provided that it's still readable at all by the time you'd try to make a new image of it...

Dominus
Posts: 30
Joined: Tue Mar 01, 2016 10:32 am

Re: Bad floppies :(

Post by Dominus » Wed Mar 09, 2016 6:53 pm

ok ok ok, I understand :)

Of course I will never need anything more than the image <- famous last words :)

Dominus
Posts: 30
Joined: Tue Mar 01, 2016 10:32 am

Re: Bad floppies :(

Post by Dominus » Thu Mar 10, 2016 11:14 am

What's the correct image for a 1981 Apple II 5 ¼" disk? (Ultima 1)

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IFW
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Joined: Mon Nov 08, 2010 2:42 pm

Re: Bad floppies :(

Post by IFW » Thu Mar 10, 2016 11:51 am

Don't think it's been dumped before... but I guess something like Apple DOS 3.2 or 3.3+
My recommendation for such an old disk is to make a blind dump first (stream files only without any guide format), and find out more details using the stream files as source.

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