Wd Spread Spectrum Clocking
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I just received the Western Digital Caviar Green (WD5000AADS). I noticed it has a jumper setting "Spread Spectrum Clocking". I read somewhere this is a trade-off between speed and reduced electromagnetic noise.
DuckMaestro
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Many hardware devices that put out enough electromagnetic interference, or EMI, to interfere with the reception of TVs and radios have a feature known as spread spectrum clocking (SSC). However, SSC is not well understood by many people. It is usually disabled by default. You have the option of turning it on or off, but it's best to leave it disabled. Digital systems such as computers synchronize the activity of multiple elements through the use of a clock signal or a pulse. This signal usually exists in a narrow band of frequencies. If it's intense enough at those frequencies, it can violate FCC rules about how much EMI a device rated for certain use can put out.
SSC tries to get around this problem by shaping the emissions -- i.e., varying the frequencies used -- so that instead of the clock using one narrow frequency range, it's spread out over a number of different ones at a much lower
Moab
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The zone.ni.com and wdc.custhelp.com links are most relevant/trustworthy for me, I think. Plus this link (wdc.com/en/library/eide/2579-001037.pdf) from Psycogeek's answer. The best answer for me would cite just those three, but your answer comes the closest. – DuckMaestro Oct 10 '11 at 21:53
I would leave it as it came to me, unless I had special needs, then I would change it.
I do not believe that in this situation that any speed difference could ever be seen between the two different settings, even after advanced benchmarking repeatedly and averaging the results.
WD SATA hard drives are factory set for workstation/desktop use. For enterprise storage requirements, the jumpers can be set to enable spread spectrum clocking or power-up in standby modes. WD SATA drives are shipped from the factory either with or without a jumper shunt in the spread spectrum clocking (SSC) enable/disable position (on pins 1 and 2). It is not necessary to add or remove the jumper shunt on the drive for workstation/desktop use. For enterprise storage enviroments, use the following advanced settings:
SSC Mode (Default 1): spread spectrum clocking feature enabled or disabled. Default 1 setting is disabled or jumper shunt placed on pins 1–2. Removing the jumper enables the spread spectrum clocking feature.
SSC Mode (Default 2): spread spectrum clocking feature enabled or disabled. Default 2 setting is disabled or no jumper shunt placed on pins 1–2. Adding the jumper to pins 1–2 enables the spread spectrum clocking feature.
Who writes this stuff! I still cannot read it the way it is in the original document (last sentence looks incorrect)... Put the jumper on 1-2 to disable SSC Would that be so hard to say?
In rare situtions where there might be a frequency issue based on country, with stuff similar to this (not nessiarily this) they will often ship to that country with it set to work in that country or location.
Last week there were several posts on problems with SerialATA hard drives with SSC (Spread Spectrum Clocking) enabled when using the onboard G5 SATA and with some (not all) Mac PCI SATA cards. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
We and Firmtek have found problems with certain SATA drives which have SSC turned on and therefore will NOT work
Users thinking thier Seagate hard drive is Dead or DOA in situations, they used a Segate utility to disable SSC.
Some users have been using other brands of HDD’s (in RAID configurations) on the Intel Matrix Storage with the ICH7R on the 945 and 955 chipset and have reported that the system crashes during the installation with a BSOD. They have blamed the motherboard and memory but this is not the case. This is because SSC is disabled on the HDD.
It seems as if all the controllers that have problems with SSC-enabled drives are RAID controllers
Psycogeek
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Gaff
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It really depends if you need to use it or not. If you will be using sensitive equipment such as in a lab with the computer then you should use the SSC. Otherwise it will not really make a difference for you and you'll sacrifice a bit of speed.
kobaltz
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"Spread spectrum clocking" (SSC) lets a SATA-III (default 6 Gb/s) HDD be recognized by a SATA-I (1.5 Gb/s-only) computer. The drive manufacturer has to provide this capability to claim SATA compliance, but computer and OS vendors don't want people to know it's there, so the manufacturer uses obfuscating terminology and doesn't document SSC's real purpose anywhere.
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Why is WD hiding the fact that newer drives support enabling spread spectrum clocking (SSC)? Unless of course the newer drives no longer support SSC? If that’s the case, are the jumper pins just there for decoration?
Being able to reduce electromagnetic interference (EMI) as much as possible is a good thing surely? Less EMI means better stability and less Wi-Fi interference etc.
WD staff, if you are reading this: if all of your desktop drives support enabling SSC by jumpering pins 1 and 2, then please advertise this on the drive label on EVERY drive you manufacture.
You could refer to the links provided below for more information.
But WD seem to be missing the point entirely: please PRINT the jumper info on the drive labels on ALL your hard drives - including other brands you own i.e. HGST.
I like WD hard drives, never had any problems with them (unlike competitors). I prefer to enable Spread Spectrum Clocking (SSC) to greatly reduce/eliminate emi from the hard drive and in the BIOS settings for the motherboard components (I don’t do overclocking, so SSC is safe to enable).
Do WD staff read these posts and take them seriously? I’ve suggested in other WD forums for WD to develop self-encrypting drives with cascaded encryption for super strong security, but so far no feedback. I’ve spent a lot of money on WD hardware over the years, so please listen to me and your customers. Thanks.
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