5"25 floppies with 16 index holes

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Grue
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Joined: Tue Jan 04, 2011 7:39 pm

5"25 floppies with 16 index holes

Post by Grue » Tue Nov 15, 2011 4:02 pm

I have bounced into some c64 warez floppies with interesting amount of index holes on the disk (just one on the sleeve)

On one label there reads: "16 Hard Sectors" So I guess this is the amount of index holes... Is there any way to read such floppies with kryoflux, I have several of these here waiting to be dumped.

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karadoc
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Joined: Sun Oct 31, 2010 9:12 pm

Re: 5"25 floppies with 16 index holes

Post by karadoc » Tue Nov 15, 2011 9:34 pm

I think we are still trying to get hold of samples to support hard-sectored disks - unfortunately we've not managed to get hold of any yet. I would guess it probably wouldn't work without specific support.

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mr.vince
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5"25 floppies with 16 index holes

Post by mr.vince » Wed Nov 16, 2011 12:48 am

Please dump some with

Dtc -ffilename -i0 -i2

and we will be happy to take a look.

Email or pm me for FTP access.

Grue
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Re: 5"25 floppies with 16 index holes

Post by Grue » Wed Nov 16, 2011 3:15 pm


galibert
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Re: 5"25 floppies with 16 index holes

Post by galibert » Wed Nov 16, 2011 4:08 pm

The board thought that every hard-sector linked pulse was the end of a revolution, and as a result dumped only 5 sectors. Could you try dtc -ffilename -i0 -i5 -r85 ?

Incidentally, the log is interesting. 5760rpm is 360rpm*16, i.e. it sees every sector hole as a full revolution. When it says 7200rpm I guess it sees the real index hole (which is between two sector holes), even if I don't really explain the value.

OG.

Grue
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Joined: Tue Jan 04, 2011 7:39 pm

Re: 5"25 floppies with 16 index holes

Post by Grue » Sun Nov 27, 2011 11:09 am

I think many people havent seen shis kind of disk before so I decided to scan example:

http://sid.fi/~grue/hard_sectored_disk.jpg

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mr.vince
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5"25 floppies with 16 index holes

Post by mr.vince » Sun Nov 27, 2011 1:46 pm

Indeed. Can we have one of these to finalise support in DTC?

Grue
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Joined: Tue Jan 04, 2011 7:39 pm

Re: 5"25 floppies with 16 index holes

Post by Grue » Sun Nov 27, 2011 1:50 pm

Sure thing, pm/email me address to send one to :)

ratpadz
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Joined: Thu Dec 08, 2011 7:32 pm

Re: 5"25 floppies with 16 index holes

Post by ratpadz » Thu Dec 08, 2011 8:00 pm

Hello,
I'm from Germandy an have a similar Floppy.
It's a Memorex 2s/2d Flexible disk (5"25)
The thing is, that it ha got 10 Hard Sectors.
It looks similar to the one on Grue's picture ( http://sid.fi/~grue/hard_sectored_disk.jpg ) but has only 10 holes.
I'm not shure which size and format it is.
Do you already have any progress in reading souch Disks?
Thanks a lot,
Michael

Edit:
It seems to be a disk for the Vintage 1980's 5.25 inch Floppy in an IBM PC 5150...

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IFW
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Re: 5"25 floppies with 16 index holes

Post by IFW » Fri Dec 09, 2011 11:41 am

I am waiting for the disk to arrive in the post.

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