Daniel said:
Do you know if Western Digital and Hitachi two terabyte drives have
"Force150" jumpers?
I have found some Promise Technology cards. Are they better than
the VIA? One uses the Promise Technology PDC20376 interface chip.
I have also found some Silicon Image cards. Are they better than
the Via and Promise Technology cards?
The Hitachi drives I've looked at in the past, didn't have jumpers.
Hitachi expects you to connect the drive to a SATA II capable
controller, and then use their Feature Tool to make changes.
What I can't tell you, is whether a Hitachi SATA II drive ships
running at 150 or 300 by default. Since the drives are
supposed to auto-negotiate, logically it should ship at 300.
http://www.hitachigst.com/hdd/support/downloads/FTool_User_Guide_215.pdf
You really need to look at pictures of the product, to see whether
it has jumpers or not.
This Hitachi HDS722020ALA330 has a two pin block on the back of the
drive, but it isn't documented anywhere. Not even in the 260 page
technical spec on the Hitachi web site. Why write a 260 page spec,
including a picture showing the pins, and not say a word about them ?
http://images17.newegg.com/is/image/newegg/22-145-298-Z03?$S640W$
http://www.hgst.com/tech/techlib.nsf/products/Deskstar_7K2000
On this Western Digital, you can see room for four jumpers.
http://images17.newegg.com/is/image/newegg/22-136-456-Z08?$S640W$
This is the Western Digital jumper info. The four positions include
a position for Force150 and a position for Spread Spectrum. Spread
Spectrum caused problems for early Macintosh computers with SATA.
You shouldn't need Spread Spectrum (either on or off) for other
PC type hardware. Spread Spectrum technology is used to spread
radio frequency emissions, to fool the FCC. If you take an SS item
into an anechoic chamber and sweep out to 10GHz or whatever the top
frequency is now, the SS helps the emissions stay below the max
allowable line on the graph. Chances are, Spread Spectrum is already
enabled on the drive, and if a Spread Spectrum jumper is present,
it is there to allow the feature to be disabled.
http://wdc.custhelp.com/cgi-bin/wdc.cfg/php/enduser/std_adp.php?p_faqid=3698&p_created=#jumper
*******
One other thing you should be aware of, is "Advanced Format" drives.
Up until recently, all hard drives you could buy at retail, used
512 byte sectors. But a new kind of drive has been defined, where
the sectors are 4096 bytes. One purpose of this, is to help breach
the 2TB storage barrier. The only popular OS which is not happy with
this development, is WinXP. Some of the newer OSes have provisions
for dealing efficiently with the issue.
http://www.anandtech.com/storage/showdoc.aspx?i=3691
http://techreport.com/discussions.x/18115
As far as I'm concerned, this technology should only be used on drives
that need it. Like drives over 2TB. To introduce this and force it on
all hard drives, regardless of size, is stupid. And yet that is the
long term plan. There was another article (which I didn't bookmark),
which mentions that the entire industry plans to transition to the
4KB format.
Paul