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 Post subject: Reading a Mac disc image
PostPosted: Wed Jun 27, 2012 10:12 am 
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Joined: Wed Aug 18, 2010 9:35 am
Posts: 9
I have a Mac disc image - an XXX.dmg file - of data from a Zip drive which was run as a backup for my old RISCPC and ran under RISCOS. Is tere any way of importing that into VRPC and extracting the data from it?

Thanks in advance for any help you can give me.


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 Post subject: Re: Reading a Mac disc image
PostPosted: Wed Jun 27, 2012 10:18 am 
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Joined: Wed Oct 23, 2002 12:16 pm
Posts: 958
The answer is possibly...

On what machine was this disc image made?
What software was used to create the image?
What format was the ZIP disc? (RISC OS or DOS)


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 Post subject: Re: Reading a Mac disc image
PostPosted: Wed Jun 27, 2012 10:18 am 
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Joined: Wed Oct 23, 2002 12:16 pm
Posts: 958
The answer is possibly...

On what machine was this disc image made?
What software was used to create the image?
What format was the ZIP disc? (RISC OS or DOS)


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 Post subject: Re: Reading a Mac disc image
PostPosted: Wed Jun 27, 2012 12:23 pm 
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Joined: Wed Aug 18, 2010 9:35 am
Posts: 9
The original data was made in RISCOS format on a 100mb Iomega Zip drive and I have made a disc image from the original Zip discs on a Mac running OS X 10.7.4 using Disk Utility to obtain/make the image which is in .dmg format as you woul expect. Thanks for your interest and help.


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 Post subject: Re: Reading a Mac disc image
PostPosted: Thu Jun 28, 2012 11:12 am 
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Joined: Wed Oct 23, 2002 12:16 pm
Posts: 958
I don't think trying to create a disc image from a non RISC OS computer will help in any way. We can easily check to see what's happening.

Firstly try opening the original ZIP disc from Mac OS X.
Do you see the original contents? Or is the disc blank.

What happens when you mount & then open the .dmg file from Mac OS X
Do you see the original files? Or is the image blank/unreadable.

If the files are present then it might be possible to copy them from the disc/image into
a folder inside the VirtualRPC Harddisc4. I suggest copying from Mac OS X. The
VirtualRPC harddisc4 is located in

Applications/VirtualAcorn/VirtualRPC-AdjustSA

If the files are readable and if they copy you will find that all the filetypes are missing. Run
VirtualRPC, then use the !TypeFind application located in the fharddisc4.$.filing directory
to try and restore the filetypes. I suspect some files might have to be file typed by hand
but in my experience TypeFind will get 80%+ correct.

If the files are not present or the disc is unreasable then...

The best approach would be to get hold of a real RiscPC that's fitted with a CD writer. Then
connect the Zip drive to the Risc PC, read each of the discs in turn and copy the content
into a new directory. Once you have all the files copied burn a RISC OS format CD with the
data. This means you have a backup of the Zip discs and the files can now be read on the VirtualRPC.

I can't see any other approach that will work.


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 Post subject: Re: Reading a Mac disc image
PostPosted: Thu Jun 28, 2012 11:39 am 
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Joined: Wed Aug 18, 2010 9:35 am
Posts: 9
Thanks a lot ??? I???ll follow those suggestions.


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