Warp wrote:

>   I can't understand why defragmentation takes such humongous amounts of
> time. There were something like 40 or 50 GB worth of fragmented data,
> but if you calculate how many times you can copy 50 GB inside a modern
> SATA disk, I think that in 35 hours you could copy it over and over
> thousands of times. (Assuming it would take 1 minute to copy 50 GB of
> data, you could copy it over 2000 times in 35 hours.)
> 
>   Why does it take such a humongous amount of time? I can't understand.

Defragging is limited primarily by how fast you can thrash the heads 
back and forth, not by the maximum sequential transfer speed for the drive.

I bet solid-state drives would defrag a lot faster. (But then, why would 
you bother defragging a solid-state drive in the first place?)

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