(Solved) - can ones install SATA3 in a SATA 2 interface(9 posts)
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SATA3 uses the same 'connector' as SATA2. Same as SATA1 even. The electronics on both ends, the computer and device differ though.
SATA 3 and all SATA' devices are considered 'backwards compatible', that is if you connected a SATA III hard drive to a computer that has SATA II built-in, the drive will only operated at the speed of SATA II level. In effect, you'd not get any better performance that you would with a SATA II device (and waste your money you paid extra to get SATA III).
Well, in principle Irv is right, but the matter is a bit more subtle.
I assume you are talking about a Sata 3 SSD in a Sata 2 port. That could still be benificial. Although the maximum data transfer rate will require Sata capabiity (6Gb/sec), most operations will be running at a much lower transfer speed where the 3Gb/sec of the Sata 2 is sufficient. That has to do with the blocksize.
The maximum capability of an SSD is given for the maximum blocksize. However, most operations (of the OS) are done with 4K or 8K blocks. And here the transfer speed is a lor lower. See in the measurement picture of one of my SSDs. The numbers are in GB - assume 10Gb for one GB. That is not quite correct but close enough.
The confusion is because of the word 'interfaces'. There are two parts to using the device, how it connects between the itself and the host (motherboard in this case), and how they communicate (electronics/handshaking).
All SATA devices connect with the same cable (other than e-SATA which is a special case). The electronic/handshakes vary by version of SATA. Just like Wireless Routers, they can have A, B, G, or N speeds. Depending on router settings, you can have all computers connected to it with varying h/w speeds. Unlike SATA though, which manages each cable individually, a router will drop to the lowest speed of all devices.
Why 4 of one speed and 2 of another, probably two reasons. Many people have the older SATA i and II devices already so they'd connect it to those connections, secondly, SATA III is more expensive for the components to produce, hence motherboard costs are higher, and there are probably less devices for it now. Me, at this point in time I'd only buy a motherboard that has USB 3.0 and SATA III suport. I know I'll need it later.
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