Dumping 1541 and 1571 Alignment disks?

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BarryB
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Dumping 1541 and 1571 Alignment disks?

Post by BarryB » Mon May 05, 2014 12:19 pm

Can you dump/convert to G64/write back the Commodore 1541/1571 Drive Alignment & Utility Disk, and would the copy work just like the original? I've now got some disks with 2 index holes/write notches so can write both sides in my flippy drive!

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IFW
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Re: Dumping 1541 and 1571 Alignment disks?

Post by IFW » Mon May 05, 2014 5:05 pm

As much as they used to work in the first place... ;)
Once you write a disk, its alignment reflects on the alignment used to write the (newly written) disk, and whatever alignment changes you make based on this and using the new disk as a source will get your drive adjusted to align with this drive.
In other words, you cannot "copy" alignment - it's always what you have on the drive used to write the disk.
These soft alignment disks tend to be written on well aligned drives - and if you have a flippy modded drive, it's just as well aligned as the ones that were used for duplication at the time.

However, a "real" analog alignment disk that can be properly used for aligning drives with a scope is very different in nature, and cannot be duplicated.

BarryB
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Re: Dumping 1541 and 1571 Alignment disks?

Post by BarryB » Mon May 05, 2014 5:42 pm

So this particular Alignment disk 'could' be copied with my flippy drive and wrote back? Seeing as you guys checked/aligned the drive then it's as close as I'll get to a duplicator? I guess it doesn't use the spiral/eliptical track of an analogue disk like the 'real' analogue ones?

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IFW
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Re: Dumping 1541 and 1571 Alignment disks?

Post by IFW » Mon May 05, 2014 6:06 pm

Nothing, except for real analog alignment disks use that, so yes, you can copy it.

BarryB
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Re: Dumping 1541 and 1571 Alignment disks?

Post by BarryB » Mon May 05, 2014 7:15 pm

Or pay about $65 for an analogue disk and few hundred (or more) for a multi channel scope :lol:

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mr.vince
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Re: Dumping 1541 and 1571 Alignment disks?

Post by mr.vince » Tue May 06, 2014 7:52 am

Correct.

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e5frog
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Re: Dumping 1541 and 1571 Alignment disks?

Post by e5frog » Thu Jun 12, 2014 12:34 pm

Just bought one of those Free Spirit 1541/1571 Drive Alignment kits, program side seems to be ruined in the first half, I suspect I'll have troubles with the calibration side as well.

Did anyone make a writeable image of this disk? Any chance that it's shared?

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mr.vince
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Re: Dumping 1541 and 1571 Alignment disks?

Post by mr.vince » Thu Jun 12, 2014 2:11 pm

Is it digital or analogue? Assume it's the former, but...

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e5frog
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Re: Dumping 1541 and 1571 Alignment disks?

Post by e5frog » Sun Jun 15, 2014 9:59 am

I got hold of Kryoflux stream files, looks digital. I converted to G64 and wrote it out just to try it and it seems to work perfectly between the 80 track Mitsumi PC drive and my 1541-II, but perhaps writing it with a 40 track drive would have been better. I'm thinking the half tracks get completely blank with this method so perhaps a larger error slips through the calibration. But I guess it could maybe make a misaligned 1541 work again if it was totally out of alignment before.

There's not really any meaning writing it out at all for proper use unless it's a perfectly aligned drive that does it.

Looks like my disk had some mgnetic damage, there was a lot of this partial erase on the tracks of the first half of the disk:
Image1.png

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mr.vince
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Re: Dumping 1541 and 1571 Alignment disks?

Post by mr.vince » Sun Jun 15, 2014 2:59 pm

Could be drive damage.... Try erasing disk with a strong permanent magnet. In this case you don't get interference.

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