Jumper σε WD sata 2(επεξήγηση)

[thanassis]

παιδιά βρήκα αυτό και είπα να το ποστάρω, πως δηλαδή μπορείτε να έχετε συμβατότητα προς τα πίσω (sata 1) όπως και για την ενεργοποίηση του Spread Spectrum Clocking (που δεν κατάλαβα τι είναι και αν θέλει κάποιος ας το εξηγήσει)

(προέρχεται από εδώ: http://support.wdc.com/product/download.asp?level1=6〈=en και αφορά τους μπλε δίσκους: WD Caviar Blue /SE / SE16 (SATA II) )

[YDinopoulos]

Το ειχα δει παλια, αλλα δεν του ειχα δωσει σημασια.

Εκανα λιγο googling και βρηκα το παρακτω post (Original Link) Αξιζει το διαβασμα

I'll use very basic terms because I know this forum has computer users of varied experience.

If you have a fast modern computer and/or Overclock, leave Spread Spectrum OFF! In your Bios or other equipment like hard drives. In the older days of slow computers, spread spectrum ON wasn't a problem.

Computers today are designed to use a very fast clock speed and need a very accurate clock tic to time all the various processing. What spread spectrum does is take the sharp clean tic signal of your clock generator pulse, weakens it and spreads it into a flattened underpowered group of smaller blurred spikes of similar frequencies. Example: Instead of having a solid and clean 3.6GHz processor clock speed you will have a lower powered clock signal pulsating "around 3.6GHz". If you know a bit about computers you know that computers need a sharp and accurate clock signal to be the fastest and have the most stable timing. Low CAS DDR Ram timing is the most deeply effected for it uses the rise and fall of a good narrow clock signal to operate quickly. Would it make sense to send it a "weak blurry" spread spectrum signal instead of a crisp, strong, narrow, easy to detect spike?

Spread spectrum ON will reduce the "small possibility" of a very little RFI/EMI but at the expense of a more stable computer. With the weakened and blurred "spread spectrum" of clock signals, faster computers will not OC well. Performance RAM and other parts won't run at their full potential. Overclockers spend most of their time boosting voltage and fine tuning various timings to strengthen and tighten the signal for the cleanest clock signals for the quickest, most stable computer systems. I don't know a home user that would ever need Spread Spectrum ON, unless you're using very RFI/EMI sensitive electronic lab equipment in your home. Maybe if you have a radio telescope in your backyard scanning for life on other planets . . . :-P

If RFI/EMI was a problem inside the computer case, everything inside would have to be heavily shielded. FCC was mainly concerned about one piece of electronics in the home effecting another piece of electronics. Like if you key the mic on a walkie-talkie near your monitor, the image will distort due to RFI (radio frequency interference). If you hold a magnet near your monitor it will distort the image due to EMI (electro-magnetic interference). As long as your cordless phones, TVs, Stereos, HAM radios, CBs and everything else that edits interference that you own aren't all stacked on top of each other (which would be really dumb), you'll be just fine.

As a Computer Tech, my favorite giggle is when I'm doing an on-site consultation of an unstable computer and seeing that the client has the computers Sub-woofer (huge magnet the size of your fist inside) either right beside or on top of their computer. Now you're talking EMI !!! They'd never stick a small fridge magnet to their computer for fear of corrupting data but most people don't even think about the huge 1lb. magnet in the sub-woofer!!

Here's two great technical pages that explain what Spread Spectrum is as it relates to computers.

http://zone.ni.com/devzone/cda/tut/p/id/4154

http://searchwincomputing.techtarget...189366,00.html

I hope this helps explain to all levels of users.

Hugh Merr.