Other then the details on paper, does anyone notice an actual increase in preformance with your own eyes?

They are believed to be slightly quicker, I say "believed" because up to now they seem to be like gold dust. As to if you can or cannot "see" the difference is harder to say. Overall you would "see" the difference with a stop watch, i.e. seek times and the fact that they will tend to have a larger cached buffer,maxtor for example at 16MB, as opposed to the 8MB. Seek times will be generally faster usually -8 or -9 ms. There will be a general speed increase but it will mainly be an "overall" one. Those who will "see" the benefits more than others will be: video editors, some gamers and cad users, simply because the information is more speedily available. However, in reality as the actual Hard Disk is the same . SATA / IDE / SATA2 are the interface technology names. The interface only handles the data from the disc to the motherboard. The slowest thing is the HD its a mechanical thing the best go at maybe 70mbyte/sec ie 560mbits/sec all well within ATA100 ( 100mbytes/sec) let alone ata133 or SATA150 . Its a bit like having a huge water tank feeding a long thin pipe to your tap you get a trickle ( like Big disk/big cache on USB1) and the mains feed on a 22mm pipe keeps up easily. The other extreme is having a pipe 20foot in diameter to an equally big tap when the tank empties in milliseconds and you have to wait for the tank to fill from the mains via a 22mm pipe ( SATAxx) . In both cases the water main feeds at the same basic rate no matter what . Hope this has been of some help to you. AMD64Bit 3800+ Socket 939 WinXP Pro. Nvidia:6800GT Dane Electronic Pro. Dual 1024MB 400MHz RAM Tagan 480Watt PSU: 28Amps on +12volt rail. Asus A8V Deluxe "WiFi" M/Board - AquaGate

Yeah thanks for the input.

First, what SATA2 products have you two encountered? I'm looking hard for SATA2 enclosures for new versions of external SATA RAID solutions i've been working on for over a year now, for use with Final Cut Editing on the G5. Second, to answer your questions, SATA2 allows for twice the throughput of SATA(3GB/sec). I'm sure it doesn't actually perform at that rate, but to know, you'd have to have several drives in a RAID connected via a single SATA2 connection. Otherwise, you're drives are your speed bottleneck, whether you've got them connected via SATA1 or SATA2. (I expect RAID solutions exactly like I described to come out this year, most likely using SATA2 cables to run to external stacks of drives, just like the XSERVE). SATA2's real value is as a cheap connectivity solution that will hopefully make the more expensive options (FibreChannel, SCSI, even FW800) obsolete. That's what I'm hoping for anyway. I just wish they'd hurry up.