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DDrescue - Optimum Settings

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Old 01-08-2010
DDrescue - Optimum Settings
Hi all,
Just a quick one really; cloning one healthy drive to another healthy drive using ddrescue (was using dd but wanted progress report, have tried various methods but they clash with a nested if statement- long story!)
one drive is 40GB connected internally via IDE, other is 160GB connected via USB to IDE converter cable, not fussed about loosing the extra space on the new drive, just want an exact replica including partition table etc.

so far i tried;
ddrescue -v /dev/hda /dev/sda

which was slow as hell; am now retrying with;
ddrescue -v /dev/hda /dev/sda logfile.log

which i'm yet to see; but what i wanted to know is would i gain any imrovement from playing with the blocksize or clustersize options? And if so, what would be the recommended figures? (both drives are Linux formatted if that helps). Are there any other settings i should know about?

Thanks in advance,
Darren.
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LEARN ABOUT BSD

rxformat

RXFORMAT(8)						      System Manager's Manual						       RXFORMAT(8)

NAME

       rxformat - format floppy disks (2.11BSD)

SYNOPSIS

       rxformat special

DESCRIPTION

       The rxformat program formats a diskette in the specified drive associated with the special device special.  Special is normally /dev/rrx0?,
       for drive 0, or /dev/rrx1?, for drive 1, where ``?'' is either "a" or "b" to indicate single or double density access.  The ``raw''  device
       must  be  used.	 Single  density is compatible with the IBM 3740 standard (128 bytes/sector).  In double density, each sector contains 256
       bytes of data.

       Before formatting a diskette rxformat prompts for verification if standard input is a tty (this allows a user to cleanly abort  the  opera-
       tion; note that formatting a diskette will destroy any existing data).  Formatting is done by the hardware.  All sectors are zero-filled.

DIAGNOSTICS

       `No  such  device'  means that the drive is not ready, usually because no disk is in the drive or the drive door is open.  Other error mes-
       sages are selfexplanatory.

FILES

       /dev/rrx??

SEE ALSO

       rx(4)

AUTHOR

       Helge Skrivervik

BUGS

       A floppy may not be formatted if the header info on sector 1, track 0 has been damaged.	Hence, it is not possible to format  a	completely
       degaussed disk.	(This is actually a problem in the hardware.)

3rd Berkeley Distribution					 November 17, 1996						       RXFORMAT(8)