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 PostPost subject: What floppy format is this?        Posted: Sun Jan 28, 2018 12:39 pm 
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On OSCollect I have come upon literally thousands of floppies, possibly containing very rare software and/or documents. Trouble is, I cannot ready any of them using VirtualBox, PCEm or whatever. The floppies have non-standard size and do not begin with the standard EB 3C 90 29 sequence (although in some instances it can be found later in the file). Can anyone look into the matter?

Example disk (supposed to be 360k): https://ufile.io/6cnkz


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 PostPost subject: Re: What floppy format is this?        Posted: Sun Jan 28, 2018 12:43 pm 
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The header has a "HDCPY17A" tag embedded.

https://en.wikipedia.org/wiki/HDCopy

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 PostPost subject: Re: What floppy format is this?        Posted: Sun Jan 28, 2018 2:46 pm 
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That format is fully supported by DiscImageChef:
viewtopic.php?f=72&t=36078


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 PostPost subject: Re: What floppy format is this?        Posted: Sun Jan 28, 2018 2:54 pm 
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Thanks, I tried to use your program to extract files from these floppies, but I am getting Unable to mount device, error NotImplemented message.


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 PostPost subject: Re: What floppy format is this?        Posted: Sun Jan 28, 2018 3:01 pm 
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Extracting files from FAT filesystem is not yet implemented, and won't be until mid year or so, sorry.

However latest development version includes a disk image format converter so you can convert HDCopy to "sector by sector" disk images that should be mountable on Linux and readable by WinImage.

If you need a binary tell me and I'll send you one.


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 PostPost subject: Re: What floppy format is this?        Posted: Sun Jan 28, 2018 3:04 pm 
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If you would be so kind, please PM me with a link.


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 PostPost subject: Re: What floppy format is this?        Posted: Sun Jan 28, 2018 6:48 pm 
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asad10 wrote:
If you would be so kind, please PM me with a link.


Sent.


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 PostPost subject: Re: What floppy format is this?        Posted: Sun Jan 28, 2018 9:12 pm 
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Ok, the format is identified as follows:

Code:
Image information:
Format: HD-Copy image
Image without headers is 1228800 bytes long
Contains a media of 2400 sectors with a maximum sector size of 512 bytes (if all
 sectors are of the same size this would be 1228800 bytes)
Created on 28.01.2018 13:52:14
Last modified on 13.01.1995 00:59:18
Contains a media of type DOS_525_HD and XML type BlockMedia
Doesn't have partitions
Doesn't have sessions
Media title: 1
Media geometry: 80 cylinders, 2 heads, 15 sectors per track


So a 1,2 MB floppy but when I try to convert it I don't know what extension to use for the -o option. .img does not work since only the first sector is output (2400 times in a row).


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 PostPost subject: Re: What floppy format is this?        Posted: Mon Jan 29, 2018 11:17 am 
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asad10 wrote:
So a 1,2 MB floppy but when I try to convert it I don't know what extension to use for the -o option. .img does not work since only the first sector is output (2400 times in a row).

That is strange, it definitely worked for me when I converted some HDCopy images. Maybe I take a look at this tonight, maybe you hit a bug ;-)

Edit:It seems that you have indeed hit a bug. I devised a small fix that just needs some more testing but seems to be working for your disk image. Could you check this image (I'm at work currently and have no means of testing it)

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