On Sat, Mar 02, 2013 at 10:04:50PM +0100, Matthias Appel wrote: > Am 02.03.2013 20:59, schrieb Miod Vallat: > >>just wonder in a typical hard drive nowadays (SATA/SAS), the sector 0 > >>is in the inner or outter track ? > >>Which tracks are faster: the inner ones or the outter ? > >Only the manufacturer knows. > > > >Disks have been reporting fake geometries since more than 20 years. The > >electronic on the disk will do the necessary work to use the disk > >physical characteristic (with a varying number of sector per track) as > >cleverly as it can. > > > >Nowadays, you can't even be sure a given `software' is even contiguous > >on the disk. > > > So, how is defrag (or avoiding fragmentation) done, if you can't be > certain how the blocks are aligned?
You can't. You can only de-frag the 'view' the hardware provides you. You can't outsmart it, so just be happy. .... Ken > > AFAIK, the last blocks are on the outside of the platters so, given > a CAV, the speed is higher. > The different speeds are measurable....but I don't know if > noticeable (but I dont think so!) > > How SSDs handle block alignment is anoter story (wear-leveling et.al.) > > > Regards, > > Matthias
