SAS versus eSata raid

SAS vs SATA/eSATA (same thing different connector style)

SAS wins but controllers and hard drives are much more expensive. That being said... a SAS controller can use SATA drives too.
 
For home use and everyday use, an array of Sata drives will be good enough.

If your looking for a server, media pc that is ALWAYS on, or flat out speed than a mid range/high end raid card with some 15k rpm drives are bad ass..

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