Track Request IBM-PC Civilization 475.01 5.25'' 1.2MB

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comradesean
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Track Request IBM-PC Civilization 475.01 5.25'' 1.2MB

Post by comradesean » Fri Mar 27, 2015 5:50 pm

I've got bad sectors on Tracks 76-79 Side 0. Does anyone happen to have a good dump of these tracks they can provide? thank you

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mr.vince
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Re: Track Request IBM-PC Civilization 475.01 5.25'' 1.2MB

Post by mr.vince » Sat Mar 28, 2015 5:33 pm

Please guys, don't put them up public if you are helping the comrade! ;) There's PM available...

comradesean
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Re: Track Request IBM-PC Civilization 475.01 5.25'' 1.2MB

Post by comradesean » Mon Mar 30, 2015 3:50 pm

Ran it a couple dozen more times and I've managed to recover Track077.0, but the others look like a lost cause.

It's four bad sectors and they all lie within an executable file that I have a good copy of. Is it possible to manually correct the flux if I know what the bits should be or is it a lost cause?

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mr.vince
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Re: Track Request IBM-PC Civilization 475.01 5.25'' 1.2MB

Post by mr.vince » Wed Apr 01, 2015 1:25 pm

Yes, but - to me - not worth the effort to fake something. You would need to write a program which can read and modify stream data.

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IFW
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Re: Track Request IBM-PC Civilization 475.01 5.25'' 1.2MB

Post by IFW » Fri Apr 03, 2015 8:22 pm

That sounds very suspicious to be honest.
Reading the last few tracks of a HD disk with bad sectors is very often due to slightly misaligned drive. It is also possible that drive requires density settings (-dd0 or -dd1) to read these properly.

comradesean
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Re: Track Request IBM-PC Civilization 475.01 5.25'' 1.2MB

Post by comradesean » Fri Apr 03, 2015 11:56 pm

IFW wrote:That sounds very suspicious to be honest.
Reading the last few tracks of a HD disk with bad sectors is very often due to slightly misaligned drive. It is also possible that drive requires density settings (-dd0 or -dd1) to read these properly.
Trying a second drive right now, but looks like same results. When I change it to -dd1 the tracks come up as unknown

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IFW
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Re: Track Request IBM-PC Civilization 475.01 5.25'' 1.2MB

Post by IFW » Sat Apr 04, 2015 11:07 am

That means that -dd0 is the HD setting of the drive.
Could you post the bad tracks please?


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IFW
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Re: Track Request IBM-PC Civilization 475.01 5.25'' 1.2MB

Post by IFW » Tue Apr 07, 2015 12:46 pm

Thanks, there is very slight damage visible on track 76, which is quite useful for some developments for later.
It still might be some misalignment, but less likely now.

comradesean
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Re: Track Request IBM-PC Civilization 475.01 5.25'' 1.2MB

Post by comradesean » Thu Apr 09, 2015 5:28 am

I've replaced the tracks. Ended up purchasing a new copy off eBay. I CRC checked every track to make sure it was an exact duplicate and it matched up so I just took the new dump which had zero errors.

Would it be of any help if I provided you with the correct tracks as well?

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