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Old 14 August 2014, 21:36   #1
AnnaWu
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CHD harddrives

Maybe it is the wrong thread.

Toni I have a question:
Is it possible to support the HD CHD format?
WinUAE support already the CD CHD format.



AmigaOS3.9 CyberStorm PPC 2.hdf = 268.435.456 bytes
AmigaOS3.9 CyberStorm PPC 2.chd = 29.048.832 bytes
The hard disk image (CHD) is already uncompressed (no zlib, lzma, huff, flac, et cetera) so it should be writeable.

Last edited by AnnaWu; 14 August 2014 at 22:43.
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Old 15 August 2014, 15:10   #2
amilo3438
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Quote:
Originally Posted by AnnaWu View Post
Maybe it is the wrong thread.

Toni I have a question:
Is it possible to support the HD CHD format?
WinUAE support already the CD CHD format.
Of course that it is:
Quote:
Originally Posted by AnnaWu View Post
It is absolutely a off-topic
The right place is: "request.UAE Wishlist" -> http://eab.abime.net/forumdisplay.php?f=56

p.s. Anyway thanks for a new request.

Last edited by amilo3438; 15 August 2014 at 15:35.
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Old 15 August 2014, 17:46   #3
Toni Wilen
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Quote:
Originally Posted by AnnaWu View Post
Maybe it is the wrong thread.

Toni I have a question:
Is it possible to support the HD CHD format?
WinUAE support already the CD CHD format.



AmigaOS3.9 CyberStorm PPC 2.hdf = 268.435.456 bytes
AmigaOS3.9 CyberStorm PPC 2.chd = 29.048.832 bytes
The hard disk image (CHD) is already uncompressed (no zlib, lzma, huff, flac, et cetera) so it should be writeable.
It surely is compressed.. Or it does not store empty blocks but if thats true, just use "Dynamic HDF" hardfiles which is basically same thing.
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Old 15 August 2014, 18:08   #4
amilo3438
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I assume that the request was for the desire to be compatible with MESS/Amiga emulator driver !?

p.s. I guess the point is if one has already an .hdf file to transfer it into HD CHD format that is far smaller. (Currently a such HD .chd file is not supported in WinUAE ... only CD .chd is supported)

Last edited by amilo3438; 15 August 2014 at 21:03. Reason: corrections
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Old 15 August 2014, 20:31   #5
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Quote:
Originally Posted by Toni Wilen View Post
It surely is compressed.. Or it does not store empty blocks but if thats true, just use "Dynamic HDF" hardfiles which is basically same thing.
It does not store the empty blocks like the Dynamic VHD image but it will be great to support the HD CHD to be MAME/MESS format compatible.
Additional if I want use hard disk images as "read-only" it can be compressed too.

Further Pro's:

1.) use existing CHD images
2.) easy conversion from HDF to CHD

Anna

Last edited by AnnaWu; 15 August 2014 at 20:36.
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Old 15 August 2014, 21:05   #6
amilo3438
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Originally Posted by AnnaWu View Post
Additional if I want use hard disk images as "read-only" it can be compressed too.
The HD CHD "read-only" isnt that the same format as existing CD CHD !? (wondering isnt this already supported)

Last edited by amilo3438; 15 August 2014 at 21:12.
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Old 15 August 2014, 21:12   #7
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Anna, support chd in WinUAE there and it works. Just checked:

 
Old 15 August 2014, 21:25   #8
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Quote:
Originally Posted by Yaranga View Post
Anna, support chd in WinUAE there and it works. Just checked:
Hmm, I have tried an PC "empty.chd" file to format in WinUAE and it say that it is write-protected!?

Have you tried to save something on your .chd file ? (does it work)
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Old 15 August 2014, 21:27   #9
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Yaranga, let me make a double check.

amilo3438, no it is not the same because you have specify the CHS values (cylinders,heads,sectors) to create a HD CHD image.

Here the source: http://git.redump.net/mame/plain/src/tools/chdman.c

Last edited by TCD; 15 August 2014 at 21:37. Reason: Back-to-back posts merged.
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Old 15 August 2014, 21:33   #10
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Originally Posted by amilo3438 View Post
Have you tried to save something on your .chd file ? (does it work)
Alas, unfortunately, it does not work. Read only.
 
Old 15 August 2014, 21:44   #11
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If it is "read-only" I guess your HD CHD is compressed or WinUAE try to handle it as CD CHD image and the HD CHD image format (read-/writeable) is not supported.
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Old 15 August 2014, 21:54   #12
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That's right, Anna, was the usual level of compression. Rebuilt CHD HD without compression - alas, the situation has not changed ...
 
Old 17 August 2014, 14:56   #13
Toni Wilen
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http://www.winuae.net/files/b/winuae.zip may support writing to uncompressed chds. Not tested.

Take backup of your CHD before testing!
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Old 17 August 2014, 17:52   #14
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Test: [ Show youtube player ]
Read only.
 
Old 17 August 2014, 17:57   #15
Toni Wilen
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Quote:
Originally Posted by Yaranga View Post
Test: [ Show youtube player ]
Read only.
I don't watch videos. Too boring. Correct method is to attach mostly empty chd for testing.

EDIT: I think I found the problem..

Last edited by Toni Wilen; 17 August 2014 at 18:40.
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Old 17 August 2014, 18:47   #16
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Should work now. Same winuae.zip URL. (Falls back to read-only if physical file can't be opened in read-write mode)
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Old 17 August 2014, 19:14   #17
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Good ...
Attached Files
File Type: 7z disk64meg.7z (9.5 KB, 112 views)

Last edited by Yaranga; 17 August 2014 at 19:32.
 
Old 17 August 2014, 19:25   #18
AnnaWu
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Excellent job, Toni

WinUAE seems now to support the HD CHD format.
I was able to format the hard disk image.
Before it was imaginary only without any changes.
Attached Files
File Type: uae AmigaOS3.1.uae (23.9 KB, 97 views)
File Type: txt winuaebootlog.txt (15.5 KB, 96 views)
File Type: txt winuaelog.txt (11.1 KB, 112 views)
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Old 17 August 2014, 19:29   #19
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And it works!
However, the difference in size is not obvious.
After formatting, the new CHD was larger than the original HDF.
But the converted disk image with an established system got a big gain in compression.

Bravo, Maestro!
 
Old 17 August 2014, 19:32   #20
Toni Wilen
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Always use quick format! Full format fills each block of drive with garbage.
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