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From: Wojciech Puchar <wojtek@wojtek.tensor.gdynia.pl>
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Subject: Re: IBM blade server abysmal disk write performances
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>
> I remember those drives from some 20 years ago. Before that time, SCSI
> and IDE drives were independently developed and SCSI drives offered way

yes. 20 years ago it was true. even in 1995, when i had SCSI controller in 
my 486 and it was great compared to ATA.

today SATA and SAS are mostly the same, just protocol are different.
the main difference is that SATA is simpler and have less problems.