Opps looks like I have same bad RAM LOL :-)
On 14 Jul 2010, at 12:00, Steve Tompkins-MacQueen wrote: > > On 14 Jul 2010, at 11:37, Phil Thompson wrote: > >> A question arising from my Hackintosh efforts..... >> >> If using dd to copy an image to a device - say an img file to a USB stick - >> does the transfer occur at the lowest level or is the image written to the >> partition / format structure that exists. >> >> My expectation was that if I dd an img file to /dev/sdc (a USB stick) that >> it would end up with the partitioning, MBR and file structure as defined in >> the img file ? >> > > I would not have thought so: The partition table is not part of the MBR (I > belive) > > > > >> If that is the case, why do I see tutorials that go on at length about >> formatting sticks and using the right file system / partition table type, >> only to then splat an image on them with dd ? > > Because if as above the partition table is not part of the MBR then the dd > image will not have the partition information. So lets say one has a 4GB USB > stick and a 500 GB HDD and did a dd image of the USB stick and dd that image > to the disk the best one could hop for is 4GB used space and 496GB unused and > un-accessable space. But because of the difences not only between HDD to > HDD and HDD to USB stick (Physichall platers, heads and the logical tracks, > cylinders, sectors and such) to most likeley out come is that the > information on the HDD would be carbage as all of the pointers to information > would be pointing to the wrong places. > > >> >> For clarity I'm taling about a simple dd command like >> >> dd if=stick.img of=/dev/sdc >> >> without any qualifying parameters > > This is often who commands are not normaly that simple. > >> >> >> Phil >> > > > Steve > > >> _______________________________________________ >> Peterboro mailing list >> Peterboro@mailman.lug.org.uk >> https://mailman.lug.org.uk/mailman/listinfo/peterboro >> > > > _______________________________________________ > Peterboro mailing list > Peterboro@mailman.lug.org.uk > https://mailman.lug.org.uk/mailman/listinfo/peterboro > _______________________________________________ Peterboro mailing list Peterboro@mailman.lug.org.uk https://mailman.lug.org.uk/mailman/listinfo/peterboro
