Re: [mythtv-users] RAID5 ATA IDE hardware card recommendations formythbackend machine

[Yan-Fa Li]

Think of an old fashioned 78RPM record player.  The disc spins at a 
constant speed, 78RPM.  The outer part of the disc is moving faster than 
the inner part, but the time the head has to read and write is the same 
regardless of where you are on the disc.  Therefore the inner part gets 
data faster because it has to spin much less to read the same amount of 
data assuming all the tracks hold exactly the same amount.

Dave Howorth wrote:
Please excuse my ignorance, but I'm not sure what you mean by the inner 
parts having greater areal density. I thought that tracks near the 
outside of the disk had more sectors so that the lineal density was 
comparable to that on the inner portions of the disk. Wouldn't that also 
make the areal density comparable?

Thanks again for all the useful advice on building RAID arrays.
Dave
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