I need a PCI card with two independent IDE channels to drive two DVD drives.

And I emphasize *independent*, because I currently have a Sil 0680-based card
with two IDE channels, but they are not independent. They are mutually
speed-limiting.

For example, when ripping two DVDs, if one is only able to read at 3x, the
other is also limited to 3x, even though alone it would be able to read at 5x.
If one runs into a read error, and loops through a few retries, the other
drive is paralyzed.

This also prevents both from burning reliably at the same time.

Just to be clear, both DVD drives are the master IDE devices on separate
cables, connected to separate channels on the card.

So, anyone know of a card with truly independent channels?

Previously Mike Ruskai <BUTthannydI@dontearthlinklike.netspam> wrote:
This sounds strange. Maybe your bottleneck is the driver instead?

If not, I have made good experience with the Promise non-RAID
cards. With one drive on each channel, you can even do
softrware RAID on both drives without trouble.

Arno

On or about 4 May 2008 02:21:41 GMT did Arno Wagner <me@privacy.net> dribble
thusly:

I'm pretty sure it's the hardware. It's two IDE channels, but they're sharing
one bus connection, which I saw confirmed somewhere that was selling a Sil
0680 card.

I'll have a look at them. Thanks.

I have no problems copying at 4X between DVD on the same Intel IDE channel.
That's 6MB/s, it should go faster. Are your applications using SPTI, not ASPI?

"Mike Ruskai" <BUTthannydI@DONTearthlinkLIKE.netSPAM> wrote in message
newsqvp14h2m643ojskvgs6im0bfkubsf9d1c@4ax.com...

Mike Ruskai wrote:
I know this is the low-tech solution, but why not just do a
store-and-burn? That way each drive will be run at different times, and
you won't have any data contention problems.

How about getting a SATA DVD burner? All SATA drives are their own
masters. DVD burners are cheaper than any external IDE controller solution.

Yousuf Khan

On or about Mon, 05 May 2008 11:46:30 -0400 did Yousuf Khan <bbbl67@yahoo.com>
dribble thusly:

I think you misunderstood. I don't mean reading from one and burning to the
other, I mean burning to both at the same time from either the same source
(when I want multiple copies of the same data), or two different sources.

I actually have three DVD drives, and I can burn to two at once, provided that
one is the burner attached to the motherboard's single IDE channel.

It's not infrequent that I'd want to burn three discs at a time, but I can't
due to the limitations of the controller.

Last I looked, SATA ATAPI devices were problematic at best. And certainly
more expensive than an IDE controller, if I could find one that will work.

So far it's looking like those that might be suitably independent don't
support ATAPI devices (Highpoint Rocket 133), or should support them but
apparently don't, due to poor firmware (Promise Ultra 133TX2).

I even tried adding a single-channel PCIe-to-IDE adapter from StarTech, but it
was atrocious - transferred at about 1.6x max DVD speed, and made the entire
system jittery while doing so.

It's making me more and more annoyed that SCSI has been abandoned in the
burner market, since I could otherwise have easily attached all three drives
to a single adapter, each running at full speed.

It has been a while since I looked at SATA, however, so I'll revisit that
option.

Mike Ruskai wrote:
Well, yes, above you had talked about one drive reading while ripping,
so it sounded like you were talking about reading and writing
simultaneously, not writing and writing. But then you talked about
writing and writing briefly later, so it sounded like it was a side issue.

Anyways, regardless, I've also occasionally tried to write to two drives
at the same time. It was a disaster for speed, though there were no
media errors in the final product, so it was relatively reliable.

Well, I haven't heard of any problems with SATA burners, but I won't
doubt they may have had some in the past. You can pick up a SATA burner
for between $20-25 on Ebay.

Yousuf Khan

"Mike Ruskai" <BUTthannydI@DONTearthlinkLIKE.netSPAM> wrote in message
news:jq6v14t5k6lmr6cej7n9rc7rbssjvjdfb5@4ax.com...
PCI Latency Tool may help.
Make sure no devices' latency is too high (cause bus hogging),
and that the IDE devices are similar (64 is a common value).

Mike Ruskai wrote in news:jq6v14t5k6lmr6cej7n9rc7rbssjvjdfb5@4ax.com
Oy, watch it bud, this is Yousuf you're talking to.
CSIPHS KOOK of the year award nominee.

Arno Wagner wrote:

Hello, Arno:

Are you implying that DVD drives can be RAIDed, perhaps? <g>


Cordially,
John Turco <jtur@concentric.net>

Previously John Turco <jtur@concentric.net> wrote:

Well, they can, but it does not make a whole lot of sense ;-)

Seriously, a software RAID1 load is massively slowed down when
both drives are on one IDE channel. With the Promise cards,
it is not when the two drives are on two channels. With this
my statement becomes relevant to the OP's question.

Arno

On or about Tue, 06 May 2008 12:11:47 -0400 did Yousuf Khan <bbbl67@yahoo.com>
dribble thusly:

The trick is to either have a 8+ drive stripe, or use different spindles for
the two burns.

I've ordered an Asus SATA burner, so I'll see how that turns out.

On or about 9 May 2008 09:04:00 GMT did Arno Wagner <me@privacy.net> dribble
thusly:

Not necessarily. If the card is handling the RAID, then it's equivalent to
only one drive. The card may be easily able to read/write from/to both drives
independently, but it's only using the bus for one logical drive.

If you really want to know whether it's relevant to my original question
(independent DVD drive use), you'd have to confirm that a software RAID0 array
on the card works, since then both hard drives are transferring data on the
bus.

As it happens, the Promise cards have a reputation for not supporting ATAPI
properly, so it doesn't much matter whether the channels are truly
independant, as far as I'm concerned.

Previously Mike Ruskai <BUTthannydI@dontearthlinklike.netspam> wrote:
.... "software RAID" ...

Some people claim that is a myth. I would'nt know.

Arno

On or about 10 May 2008 15:48:01 GMT did Arno Wagner <me@privacy.net> dribble
thusly:

Ambiguous. Software RAID 1 on a single IDE channel, or some unspecified type
of RAID 1 on a RAID adapter. I saw it as a comparison between what's
available with and without said RAID adapter. Hence, "Not necessarily", as
opposed to "no, you're wrong, blah blah".

When several different people who have bought the card post about the same
kind of problem, I give it some weight. It may be that the card does in fact
share bus communication between the channels, so that someone using a hard
drive on one channel and a DVD burner on the other gets poor results when
trying to write to the latter from the former. Either way, if several people
complain about DVD drives not working, it's not exactly a good bet for me to
buy it for nothing but DVD drives.

In any case, I have since purchased an Asus DRW-2014L1T SATA drive, which so
far seems to be working just fine. I can't say I understand the label of
"20x" DVD write speed, when it never gets above 16x during a full disc write
(on Verbatim 16x DVD+R MCC media) . And strangely enough, it actually slows
down near the end, while all the other burners I've had speed up near the end,
when the linear speed of the media under the laser is at max.

But at least now I can use three drives at a time at full speed.

Previously Mike Ruskai <BUTthannydI@dontearthlinklike.netspam> wrote:
Since I never mentioned RAID adapters, what do you think
I meant?

That is, I bleive, called design for marketing. There will be
one specific media it can do 20x with, but only the one....

Maybe it has problems with vibration. That is wors towards the end.

Good. So I see your problem is solved.

Arno