[MacDV] Re: more about the inutility of defragmenting an OS X FS.

[Steven Rogers]

On Wednesday, December 31, 2003, at 03:23 PM, James Asherman wrote:

>> You don't and can't know how the blocks are laid out on physical 
>> disk.  You can't know it  because that information doesn't leave the 
>> disk controller.  The controller maintains a fiction of putting the 
>> blocks where you ask, but it actually puts the blocks wherever it 
>> wants to.  . . .
>
> I'm not stupid. I know how a disc works and what are the illusions and 
> what are the realities.  The reality is we need 10's of gigs all ina 
> row so that we miss not 1/60th of a second of video looking for 
> someplace new to put it.  . . .

I don't see how you can accept the idea that the positions reported by 
the controller are not the actual physical positions, and then continue 
going on about how important defraging is get contiguous space.

SR