WD jumper settings question

Building a new system. Windows 7 64bit, Gigabyte X58 UD5 mobo. Just taking a look at the new drives I got today.

Four of them are going to be in a RAID 5 array. They are all WD1001FALS 1T HDD's ( The sticker on the drive says jumper pins 3/4 for PUIS and pins 5/6 for 3Gb/s. I can't find anything on the WD site to clarify this ( These are already 3Gb/s drives. My previous disks didn't need to be jumpered for that AFAIR. Anyway, PUIS sounds like it would be bad to do with a RAID array but I don't know. So that's my first question. I'm guessing I don't want to jumper pins 3/4. Second is I'm guessing I should not have to jumper pins 5/6 because the WD site makes it sound like that will downgrade them to 1.5Gb/s.

Two of the drives are going to be RAID 0. They are WD6402AAEX 640GB HDD's ( Same thing on the sticker on the drive but it says pins 5/6 limits to 3Gb/s. I do want that because I'm going to use them in 3Gb/s SATA ports and these are 6Gb/s drives. So that's fine. I knew I would have to do that. But I have the same question on these regarding PUIS as with the 4 drives mentioned above.

I've never been confused about jumper settings on drives before. This time it's not clear enough to me so I thought I'd ask around. :)


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  1. Best answer
    On the issue of pins 5-6 on the WD1001FALS drives, the label on the drive is WRONG. see this WD answer page:!!&p_li=&p_topview=1

    On the PUIS question, Wikipedia shows this acronym is for Power-Up In Standby, also known in WD parlance as PM2. See this page:!!&p_li=&p_topview=1

    Cliffs: this setting normally is NOT used in a desktop machine. It allows the HDD to start up only partly and then wait for a signal to spin up ready for use. Most BIOS's don't do this, but some RAID systems can use it if you want to set up to save energy when not using the RAID array. Before using it be sure your RAID system can use the feature by issuing appropriate commands.
  2. Best answer selected by avianrand.
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