On Wednesday 03 September 2008 05:57:47 Jarry wrote: > Alan McKinnon wrote: > >> dd if=/dev/sda2 of=/dev/null > >> 957169664 bytes (957 MB) copied, 17.5531 s, 54.5 MB/s > >> > >> dd if=/dev/sda12 of=/dev/null > >> 820854784 bytes (821 MB) copied, 21.4136 s, 38.3 MB/s > > > > What do you conclude from this? > > I'd say that /dev/sda2 is near "beginning" of disk (outer side, > more sectors per cylinder, higher transfer speed), and /dev/sda12 > is near "end" of disk (inner side, less sectors per cylinder, > lower transfer speed).
Ah, I see my troll caught one already. You seem to be under the common delusion that the structure reported by fdisk actually means something about the physical disk :-) These days the entire concept of a "cylinder" is a mere abstraction to make tools like fdisk work in a sane manner. But yes, it does seem that in this case sda2 is probably near the outer edge of the platter where the head speed relative to the disk is higher. -- alan dot mckinnon at gmail dot com
