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?
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
