How to duplicate a HD using dd

[Thiago Vinhas de Moraes]

Em Sáb, 2003-10-11 às 19:16, jdow escreveu:
> From: "Thiago Vinhas de Moraes" <tvinhas at techbyte.com.br>
> 
> > Sory for the OT, but does anyone the best way to duplicate a HD in
> > Fedora, just like Norton Ghost does in Winblows? 
> > 
> > I tried to use dd if=/dev/hda of=/dev/hdb, but the proccess has never
> > stoped, after a few hours. 
> > Both are 40Gb hard drives, but from different manufacters. One is a
> > Maxtor, and the other one is a Samsung.
> 
> If the drives are basically the same size with the destination drive
> being the larger drive if you elect to waste some drive, then the
> dd approach is the fastest. However it is best to add a suitable
> "bs=8225280" or if you don't wish to be so profligate with memory
> "bs=131072" should be nearly as fast.
> 
> "dd if=/dev/hda of=/dev/hdb bs=131072", for example

What's the difference between "bs=8225280" and "bs=131072" ?

I tried without the "bs" and when booted with the copied drive, got
infinite fsck problems that I don't have with the original hd. Do you
know why?

Thanks for your help.
Thiago