Super User is a question and answer site for computer enthusiasts and power users. Join them; it only takes a minute:

Sign up
Here's how it works:
  1. Anybody can ask a question
  2. Anybody can answer
  3. The best answers are voted up and rise to the top

I've got a new hard disk. On the label there is a description of the jumper settings:

PHY jumper

One of them is:

Jumpered pins 5 and 6 enables 1.5GB PHY

What does PHY stand for?

share|improve this question
up vote 16 down vote accepted

It's SATA II disk, right?

And if you put jumper on these pins HDDs will be SATA I.

It's there for if your motherboard doesn't support SATA II.

share|improve this answer
Yep, take a look at… – Mark Pim Jul 23 '09 at 12:13
Yes, it's a SATA II disk. – splattne Jul 23 '09 at 12:13

PHY stands for "physical layer". By jumpering pins 5 & 6 will cause the drive to go into a legacy 1.5 Gbit/s mode, rather than its default 3.0 Gbit/s mode. Check out the Wikipedia article on SATA for a bit more info.

share|improve this answer

By jumping the two pings, 5 and 6, you limit the transfer rate to 1.5 GB/s.

PHY is simply the physical layer in question, between the drive and cables/transfer.

Take a look at Wikipedia's page on SATA throughput.

share|improve this answer

I bought the same disk 2 days ago. What everyone else says is right, jumpering those pins will limit the transfer rates to 1.5Gb/s rather that the 3Gb/s it is capable of.

Pins 1 & 2 enable Spread Spectrum Clocking which reduces the drives electronic noise, at the cost of some performance.
Pins 3 & 4 enable Power-Up In Standby (low power mode). Your motherboard needs to support this. I couldn't find any way in Vista to get my external drive out of standby.

share|improve this answer

You must log in to answer this question.

protected by BinaryMisfit Nov 29 '10 at 19:25

Thank you for your interest in this question. Because it has attracted low-quality or spam answers that had to be removed, posting an answer now requires 10 reputation on this site (the association bonus does not count).

Would you like to answer one of these unanswered questions instead?

Not the answer you're looking for? Browse other questions tagged .