maximus
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HDDSuperClone vs ddrescue

Wed Aug 23, 2017 6:14 pm

I would also like to know the computer CPU info (family and speed), and what Linux OS (including version) you are using.
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jol
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HDDSuperClone vs ddrescue

Thu Aug 24, 2017 6:31 am

regarding ruling out writing process, will let you know when done
regarding the computer specs and linux OS, I tried various computers some better some not also different OSs and versions including your Lubuntu ISO from your website, and there was not any significant differences
the leading line was the same everywhere, which is a diff. between ddrescue and HDDsuperclone about 30% (in favor of ddrescue)

maximus
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HDDSuperClone vs ddrescue

Thu Aug 24, 2017 2:44 pm

If it does turn out to be the writing process, please add the option --odirect to the ddrescue command to see if it slows down to the speed of hddsuperclone.

If it is not the writing process, then try running hddsuperclone in the two different modes SCSI and ATA passthrough, and see if there is a difference between them. If that is not it, then add --idirect to the ddrescue command to see if it slows it down to the speed of hddsuperclone.
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maximus
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HDDSuperClone vs ddrescue

Fri Aug 25, 2017 7:24 pm

After some testing I have found the condition that causes this. Most of my testing has been to image files which seem to respond better to using a direct non-buffered write. But when cloning to another disk the non-buffered writing is slower, by almost exactly the 30% reported. So my instinct that it is the writing process is correct. I will add an option in the next release to address this. I still have to figure out how best to implement it since it seems better one way or the other if the destination is an image file or a drive.
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maximus
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HDDSuperClone vs ddrescue

Sun Aug 27, 2017 5:42 pm

I have added an option in the GUI to enable or disable the OS write buffer in the latest release (version 1.10 released 8-27-17). It is enabled by default, which seems to be the faster setting. For those still using the command line mode, it is enabled by default with no way to disable it.
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maximus
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HDDSuperClone vs ddrescue

Sun Aug 27, 2017 5:50 pm

maximus wrote:Source of the post I have added an option in the GUI to enable or disable the OS write buffer in the latest release (version 1.10 released 8-27-17). It is enabled by default, which seems to be the faster setting. For those still using the command line mode, it is enabled by default with no way to disable it.


Please test with this latest version to confirm that it resolves the major speed difference.

I would like to point out that in my testing, I did find that for some reason, the ATA passthrough mode seems to be slower than the SCSI passthrough mode in some cases. It seems to be just as fast until it hits bad sectors, which does not make any sense considering it is a more direct way of reading.
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jol
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HDDSuperClone vs ddrescue

Sun Aug 27, 2017 9:13 pm

maximus wrote:For those still using the command line mode, it is enabled by default with no way to disable it.

Auch, I never used the GUI :o

maximus
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HDDSuperClone vs ddrescue

Sun Aug 27, 2017 9:44 pm

Well, it is at least changed in the command line mode to be enabled, so it should be faster now. And be prepared, I now have all the free options in the GUI. Once I get all the other special options in the GUI, the command line mode will be removed. Maybe not right away, but I am not adding any new command line options. It is too difficult to maintain both the GUI and command line.
http://www.sdcomputingservice.com
Home of HDDSuperClone and HDDSuperTool

jol
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HDDSuperClone vs ddrescue

Sun Oct 15, 2017 9:43 am

another thing where HDDSuperclone couldn't do but ddrescue does it, with no questions asked

I tried to flash an img file to a flash drive using HDDSuperclone, but got an error with exit code 4
whereas ddrescue made it without any problem

maximus
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HDDSuperClone vs ddrescue

Sun Oct 15, 2017 10:05 am

Nope, HDDSuperClone cannot currently do that. I guess it would not be too hard to add a "normal" read mode in a future release, but not a high priority at the moment.
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