I'm recovering the HDD from my laptop that died (wouldn't boot up at all, Disk Utility reported that there were no problems, but wouldn't mount the disk). I've hooked up the HDD through the USB adapter. Running
ddrescue like so:
sudo ddrescue -v -n /dev/disk1s2 "/Volumes/Original HD/image.dmg" ddrescue.log
There are no errors so far, but the average read speed has gradually dropped to 50KB/s. It was around 2MB/s at the beginning. The size of the partition is 300GB. So far I've been able to recover 160GB. I'm recovering to an HFS+ partition on my MacBook.
What could be the reasons for this slow transfer rate and how to increase it?