[Bug-ddrescue] ddrescue datarate-question

[wolfgang . rissler]

Hello ddrescue-Team,

I dont want to report a bug, but I have a question about the behavior of
ddrescue v1.7.

I tried to save a partition /dev/hda1 into a file /media/hdb1/imagefile.
Logfile is also there /media/hdb1/logfile. This worked fine until the error in
the 25 GByte Parition at nearly 9GByte. At the error of course the data
transferrate broke down from about 8 MByte/s to 35 kByte/s. Thats ok.  A
long time I was waiting for the transferrate to increase again, because there
are no more errors in the partition as far as I know. But after 4 hours and
about 0,5 Gbyte the datarate didn't increase. So it would take about 4 days for
the rest of the partition and I interrupted with Ctrl-C at first.  

Commandline was:
ddrescue -n /dev/hda1 /media/hdb1/imagefile /media/hdb1/logfile

My question is: is this behavior normal or could I call a commandline option so
that ddrescue will adapt the datatrate to the errorrate. Or is there a way to
stop reading after the error, then read from this position with the same image,
new logfile and high datatrate and the image will be concatenated together:

ddrescue -n -s errorpos+errorlenght /dev/hda1 /media/hdb1/imagefile
/media/hdb1/logfile1

ddrescue -n -i errorpos+errorlenght+1  -o errorpos+errorlenght+1 /dev/hda1
/media/hdb1/imagefile /media/hdb1/logfile2

?
I hope you could understand what I mean, my english isn't too bad and my
questions aren't too stupid.

Thanks a lot.

Wolfgang