Re: [Bug-ddrescue] Quirk or bug?

[Antonio Diaz Diaz]

Hello Paul,

For some reason, the spam filter of bug-ddrescue deleted your message.

Paul L Daniels wrote:
> I've been doing quite a lot of HDD rescues and the GNU ddrescue is one of the 
> tools I use most frequently, however I've come across a quirk when using it.
>
> If I copy an image back to a new fresh drive using ( source image can be either 
> on another USB3 connected drive or local SATA internal drive) :
>
>         ddrescue -v -f myimage.img /dev/sdc
>
> I'll get full 100~120MB/sec performance out of USB3 or eSATA... however, if I 
> do this...
>
>         ddrescue -i 50G -v -f myimage.img /dev/sdc
>
> It'll drop to 20~30MB/sec performance.  I've noticed this behaviour on several 
> systems, including USB2 based devices.
>
> Any specific reason why this should happen? 

Well, no.

Have you tried a multiple of 64KiB for -i (for example "-i 50GiB")?