Once again. SSD. SATA-II and SATA-III compatible?

Question

ASUS

History is as old as the world.
I change the HDD in a netbook to an SSD, and, in fact, I choose it.
HDD was on SATA-II. I read that SATA-III seems to be backward compatible with SATA-II. Is this true in reality? Maybe I didn't read it at all? Or is it only when the machine supports SATA-III that SATA-II devices are also supported? Is it worth it to take a newer SSD and on a new standard, or is there a chance that it will not take off? Netbook - Asus 1225C, inside Atom N2600.
Well, and ... Maybe you will advise something specific right away?
Size: 60-128 GB.
Budget: preferably no more than 4000r.
Tasks: system disk for 2 OS.
Looked out for OCZ and Intel as verified.
Thanks for answers.

Answer 1

SATA-III device works without problems with SATA-II controller. OCZ Vertex 4 is working for me now, it pleases me beyond words. Recommend :)

Answer 2

Don't worry, everything will work fine (except that the speed, for obvious reasons, will be exactly what is possible on your hardware).

Answer 3

Officially Compliant:
www.sata-io.org/documents/SATA-Revision-3.0-FAQ-FINAL.pdf
Frequently Asked Questions About SATA 6Gb/s and the SATA Revision 3.0 Specification (May/June 2009)

Q8: What does backward compatible mean?
A8: Backward compatibility means that SATA 6Gb/s hosts and drives will operate when
connected to 3Gb/s or 1.5G/bs drives and hosts, by automatically dropping to the appropriate
transfer rates.

However, it is sometimes reported that older BIOS versions may not always work with newer devices in ACHI mode (IDE mode worked).
Sandisk explicitly states that SATA3 SSDs are compatible with SATA2 and SATA3 controllers: kb.sandisk.com/app/answers/detail/a_id/8142/ ~/difference-between-sata-ii-vs.-sata-iii
Here is support's answer OCZ: www.ocztechnologyforum.com/forum/showthread.php?98362-Is-OCZ-PETROL-SATA-III-2-5-quot-SSD-backwards-compatible-with-Sata1

Petrol and Octane are sata3, sata2 and sata1 compatible

Answer 4

My intels worked fine on sata2 controllers (g31 and p43 desktop chipsets).

Answer 5

OCZ Vertex 4!

Answer 6

a lot of places shoved SSD everywhere the “WOW” effect on new hardware with sata3
when I put it in laptops that are 3-5 years old, the effect was ... “uhm well ok” it really gets better, not so much so that “wow” :)

Answer 7

With the exception of possible BIOS firmware incompatibilities, the principle works well in consumer electronics:
“if the connector fits mechanically, then it will work.”
SATA connector, as far as I know, has not changed.