Instruction: Answer the given question by extracting information from the supporting document.

Input:
Question: Is this SATA II compatible?
Document: Does what it's supposed to do - what more is there to say really? If you've an older system and need more SATA connectors, this does the trick.
What can I say, its simple and works as it is intended. Highly recommend for anyone that needs a few more SATA power adapters.
This splitter does exactly what it is supposed to do: make two SATA power connections where only one existed before. Works perfectly.
These split a SATA power plug. It works as you think it should. It will give you 2 power plugs instead of one.
Your basic 6in SATA Power Y Splitter Cable Adapter. Once again, nothing special just good quality and price.
Used to install new SATA Hard Drive to my computer, installation was easy and the drives are working well, no problems.
These were invaluable when the StarTech.com 350 Watt ATX power supply turned out to have inadequate SATA cabling out of the box.
Worked perfect to power an extra hard drive. I just plugged it in, and had SATA Power to spare. Fast, Easy Shipping.
Was exactly what I was looking for to connect a SATA DVD drive in my HTPC that didn't have enought SATA power plugs and arrived very quickly.
Not a whole lot of sexiness to a SATA power cable, so I'll just say it works...and because it works, I gave it 5 stars.
Answer: This is just a power connection splitter for SATA drives (hard drives,SSD drives or Optical drves). The power connection on SATA I and SATA II drives are the same.