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Old 23 March 2019, 14:24   #21
chip
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For tmb

Since this one is a WORK IN PROGRESS upload, can you please inform us when it's completed

So that we know that we can download the files

Thanks again tmb
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Old 25 March 2019, 13:57   #22
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Quote:
Originally Posted by dlfrsilver View Post
Can you ask him to voice out what those are ?
Every second sector of certain disks has a broken sector header (IIRC there was an extra bit found there). We have no idea how these were written, perhaps they were copied in nibble mode with a machine with broken memory or something? Or perhaps just a buggy copier that worked at the MFM level for some reason.

trackdisk.device on a real Amiga can handle these incorrectly written disks, but the disk reads a lot slower than a disk with intact sector headers.
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Old 01 April 2019, 12:52   #23
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@chip, It's never going to be finished, TMB is sourcing disks from all over europe.
You might be better off asking when the world ends
@dlfsilver you know the channel to ask the right questions in.

Newly dumped disks are pure gold, everyone remember that, because without the hard work of some Amiga lovers, you'd have nothing.
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Old 01 April 2019, 16:28   #24
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Originally Posted by icycool View Post
[...] Newly dumped disks are pure gold, everyone remember that, because without the hard work of some Amiga lovers, you'd have nothing.
. Thanks for the work!
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Old 01 April 2019, 16:57   #25
lesta_smsc
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Quote:
Originally Posted by Jope View Post
Every second sector of certain disks has a broken sector header (IIRC there was an extra bit found there). We have no idea how these were written, perhaps they were copied in nibble mode with a machine with broken memory or something? Or perhaps just a buggy copier that worked at the MFM level for some reason.

trackdisk.device on a real Amiga can handle these incorrectly written disks, but the disk reads a lot slower than a disk with intact sector headers.
But if you are doing a raw dump then these incorrectly written sectors should also be dumped. Then a little tweaking may be able to get them working?

As far as I recall, if someone was to KF/SC dump a disk, it cannot be written back directly (or at least that's what someone with the hardware has told me) without some further adjustments. Maybe this is what dlfrsilver could shed more light/help on?
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Old 01 April 2019, 17:46   #26
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But if you are doing a raw dump then these incorrectly written sectors should also be dumped.
Yes, naturally the exact contents of the disk gets dumped into the raw file, broken sector headers and all. Then dtc (the tool that comes with kryoflux) refuses to decode the broken sectors, but gets the working ones. All the data is still in the raw.

To understand why it is like this, KF/dtc come from a software preservation standpoint. It could be a copy protection, it might be a broken disk, but it doesn't second guess. It only accepts correct data.

Quote:
Then a little tweaking may be able to get them working?
Precisely. The file format for the raw file is available + you can also mfm decode with the HxC tool and I think KeirF's disk utils as well.

Quote:
As far as I recall, if someone was to KF/SC dump a disk, it cannot be written back directly (or at least that's what someone with the hardware has told me) without some further adjustments.
True. While you can just write back a raw stream, there is no guarantee that your copy will work if this is done. The ipfs that everyone loves to hate are built from raw dumps, but actually contain information accurate enough for a successful remaster.
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Old 07 April 2019, 20:20   #27
tmb
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got an A600, will know if it is working in about a week, when it will arrive.
wished i had a nice fastram expansion like the A6095 so i could use samba, well cant have everything at once.

expect the problem disks to be transfered soon and also other new disk images popping up in this collection soon (many more disks to come!)
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Old 07 April 2019, 20:35   #28
chip
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Good to know ..... thanks !
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