[Bug-ddrescue] ddrescue, hard drive stops succesfully reading after 547MB

[bygorp]

This is not a bug, but I'm new to ddrescue and am trying to recover data from
a 250GB WD2500JD-75GBB0.  I am using ddrescue to save an image file to an
already ntfs partitioned 750GB drive with plenty of free space.  I believe
my drive may be going offline after reading some bad sectors.  Or maybe i am
doing something wrong.
I identified the partitions using:
sudo lshw -C disk -short
cat /proc/partitions

Then used the following to run ddrescue:
sudo mkdir mnt
sudo mount /dev/sda1 mnt
cd mnt
sudo mkdir recovery
cd recovery
sudo ddrescue -r 3 /dev/sdb image log

Press Ctrl-C to interrupt
Initial status (read from logfile)
rescued:     0 B,  errsize:   0 B,  errors:       0
Current status
rescued:     547581 kB,  errsize:    249 GB,  current rate:      0 B/s
   ipos:     10404 MB,   errors:       21,    average rate:    4131 B/s
   opos:     10404 MB,  time from last successful read:     1.2 d
Retrying bad sectors... Retry 3
Interrupted by user

Restarting ddrescue produces the same result as above.  
The drive is still apparent with:sudo lshw -C disk -short  & cat
/proc/partitions, but sudo fdisk -l correctly shows my 750 GB
drive/partition but has:
Error: /dev/sdb: unrecognised disk label

I power cycled and was able to read using -d -r 1 -c 10
--initial--position=30GB.

It read ~3GB then had 0 successful reads for an hour before i interupted. 
if i change the start position it will read some data then stop.  Is there a
something different i should be trying?  any advice is appreciated.

Any suggestions
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