[Bug-ddrescue] Weird behavior with options -d and -c

[xerces8]

Hi!

I used ddrescue 1.9-rc1 on RIPLinux v7.2.

When I add "-d -c 1500" to the command line, ddrescue does not copy,
but as it says "Splitting error areas...".
Also it says : errsize: 640 GB

Without these options it simply copies the data.

Also a lower value for -c , like 150 again works (copies, no serror area 
splitting).

This is confusing to me. What is this error area splitting ?

The complete command line used was:
ddrescue [-d] [-c 150[0]] /dev/sda /dev/null
# sda is 640 GB big

Regards,
David