[ale] CF compared to IDE

[Chris Fowler]

Two key points about the PQI modules.

1) They do not support DMA

2) Depending on model, you can get units that use power
   on IDE PIN 20 to power them.   If your motherboard 
   supports (doubtfully) power on pin 20, then you will not
   need to plug the DOM unit into the PC PS.  We have a 
   embedded type board that supports pin 20 power and a Tyan
   MB that does not.


I've been satisified with read and write speeds.

You can on ebay purchase 3.5" CF -> IDE converters that will allow you
to take a standard CF unit and plug it into your IDE.  This maybe an
option for those that can not get or do not want DOM modules.


On Mon, 2003-03-31 at 16:14, hbbs at attbi.com wrote:
> Maybe I spoke too soon.
> 
> I Googled myself a datasheet for the PQI DOMs and I'm seeing a read of 2.5MB/2
> and a wrote of 1.2MB/s - I have 340MB IDE HDDs that go about that fast.
> 
> - Jeff
> > Wow, this totally rocks.  Just one of these things - even a small one - could do
> > a lot to enhance the performance of older PCs.  
> > 
> > - Jeff
> > 
> > > The DOM is a CF->IDE converter in a compact format.  It has a IDE
> > > connector on one side and a power cable.  The power cable has 2 Power
> > > plugs.  Using one makes it behave like a master, using another makes it
> > > behave like a slave.  Although, since it plug directly into the socket
> > > on the MB, you need a IDE cable with one male plug to add another drive
> > > to that IDE channel. 
> > > 
> > > Booting is fairly fast too.  In a DOM, you get a good quality flash. 
> > > Something you may not get if you are purchasing a piece of CF for your
> > > camera.
> > > 
> > > I've used DOC (DiskOnChip) and DOM.  DOM is not single source like DOC
> > > and it behaves much better and faster.
> > > 
> > > 
> > > 
> > > 
> > > On Mon, 2003-03-31 at 14:29, Jeff Layton wrote:
> > > > Chris Fowler wrote:
> > > > 
> > > > > CF Rocks.  But check out DOM's.  They are CF's in a plastic shell that
> > > > > has an IDE connector.  They behave just like a IDE disk.
> > > > 
> > > > Isn't there something like a CF-> IDE converter as well?
> > > > 
> > > > Thanks!
> > > > 
> > > > Jeff
> > > > 
> > > > P.S. Sorry to email you directly
> > > > 
> > > > 
> > > > >
> > > > >
> > > > > On Mon, 2003-03-31 at 14:08, Jeff Layton wrote:
> > > > > > Hello,
> > > > > >
> > > > > >    Has anyone built a filesystem on a CF card (like ext2 or 3)
> > > > > > and compared it an IDE hard drive in terms of perforamnce?
> > > > > > I'm looking for a comparison of time to read/write data such
> > > > > > as a Bonnie++ test, IOZONE test, even hdparm or simple 'dd'.
> > > > > >
> > > > > > Thanks!
> > > > > >
> > > > > > Jeff
> > > > > >
> > > > > >
> > > > > > --
> > > > > >
> > > > > > Jeff Layton
> > > > > > Senior Engineer
> > > > > > Lockheed-Martin Aeronautical Company - Marietta
> > > > > > Aerodynamics & CFD
> > > > > >
> > > > > > "Is it possible to overclock a cattle prod?" - Irv Mullins
> > > > > >
> > > > > > This email may contain confidential information. If you have received 
> > this
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> > > > > > this email are those of the author, and are not necessarily those of the
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> > > > > >
> > > > > >
> > > > > >
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> > > > --
> > > > 
> > > > Jeff Layton
> > > > Senior Engineer
> > > > Lockheed-Martin Aeronautical Company - Marietta
> > > > Aerodynamics & CFD
> > > > 
> > > > "Is it possible to overclock a cattle prod?" - Irv Mullins
> > > > 
> > > > This email may contain confidential information. If you have received this
> > > > email in error, please delete it immediately, and inform me of the mistake 
> > by
> > > > return email. Any form of reproduction, or further dissemination of this
> > > > email is strictly prohibited. Also, please note that opinions expressed in
> > > > this email are those of the author, and are not necessarily those of the
> > > > Lockheed-Martin Corporation.
> > > > 
> > > > 
> > > 
> > > 
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