Instant Bad Sector w/ no retry

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comradesean
Posts: 31
Joined: Mon Oct 06, 2014 5:25 pm

Instant Bad Sector w/ no retry

Post by comradesean »

What would cause DTC to skip a track without retrying? It first happened on my Ultima II (1983) program disk on track 40.0 which I chalked up to copy protection, but then it occurred on my Might and Magic III - Disk 3 on track 0.0. The disk then went on to fail on many tracks, but it only attempted track 0.0 once.

SomeGuy
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Joined: Wed Feb 18, 2015 8:18 pm

Re: Instant Bad Sector w/ no retry

Post by SomeGuy »

If it thinks the track is blank then it does not retry. I've had it do that to me on some marginal damaged disks, and I have to manually try re-reading until it figures out that yes, there is really data here. At least with preservation mode plus guided, I can just re-read the specific track and drop the new version in over the old (usually bad) one and then decode the preservation steam file with the PCE tools instead.

comradesean
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Joined: Mon Oct 06, 2014 5:25 pm

Re: Instant Bad Sector w/ no retry

Post by comradesean »

Do you mean when the format can't be detected and it shows up UNK? I've had it halt and reattempt sectors that had no data in them before.

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

Re: Instant Bad Sector w/ no retry

Post by IFW »

If the format is unknown/unformatted there is no point in retrying since it will remain that way - except for some kind of damage/misalignment, as SomeGuy wrote above.

comradesean
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Joined: Mon Oct 06, 2014 5:25 pm

Re: Instant Bad Sector w/ no retry

Post by comradesean »

IFW wrote:If the format is unknown/unformatted there is no point in retrying since it will remain that way - except for some kind of damage/misalignment, as SomeGuy wrote above.
I'm sorry, I should have been more specific. It was actually reporting it with a big B and not as No Format. But I figured out that it wasn't actually reporting a bad sector, but just a mismatched sector. I think that's why it didn't retry. (This makes sense since that's the copy protected sector for Ultima II)

I'm guessing it was just reading residue or something for the Might and Magic disk.

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IFW
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Re: Instant Bad Sector w/ no retry

Post by IFW »

Anything that is very likely to be protection is never retried, except for wrong checksums - since the latter is often not protection.

comradesean
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Joined: Mon Oct 06, 2014 5:25 pm

Re: Instant Bad Sector w/ no retry

Post by comradesean »

An offtopic question, but are frankenstein streams acceptable for preservation? Streams with tracks taken from different drives and or different disks.

hydr0x
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Joined: Wed Dec 29, 2010 4:01 pm

Re: Instant Bad Sector w/ no retry

Post by hydr0x »

Why not just submit the original, separate streams and let SPS handle the merge?

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mr.vince
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Joined: Tue Oct 05, 2010 5:48 pm

Re: Instant Bad Sector w/ no retry

Post by mr.vince »

What hydr0x said... :)

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