- Re: What are the possible problems of using a 40-pin cable for UDMA drives?
- Posted by Papa on July 28th, 2003
Data loss, data rate slower.
"Scott" <Scott@post.any.replies> wrote in message
news:3f265ec4.504866159@news.west.cox.net...
- Posted by Eric Gisin on July 28th, 2003
"Papa" <bikingis@my.fun> wrote in message
news:60_Ua.916$mr1.184@newsread3.news.pas.earthlin k.net...
| Data loss, data rate slower.
|
Why? Are there any CD/DVD drives other than UDMA/33? These don't have data
corruption and work fine on 40-pin cables.
| "Scott" <Scott@post.any.replies> wrote in message
| news:3f265ec4.504866159@news.west.cox.net...
| > I'll ask my 2 questions at the top in case people don't want to read
| > the details:
| >
| > #1. Is it bad to use a 40-pin standard EIDE cable for a 16x DVD-ROM
| > and 48x CD writer running in UDMA mode? Given that these are slower
| > devices than hard drives I thought using the cheaper cables was OK.
| >
Not with UDMA/33.
| > #2. If you use a 40-pin cable on 1 channel and an 80-pin cable on the
| > other channel, can the 40-pin cable corrupt data on the 80-pin
| > channel? (Possibly due to high speed reflections or impedance
| > mismatches if both channels are electrically tied together?)
| >
They are aways electrically independent.
- Posted by Mike Tomlinson on July 28th, 2003
In article <bg1tu80g8b@enews2.newsguy.com>, Eric Gisin <ericg@go.to>
writes
I'm not so sure. I believe that some earlier IDE chipsets had the
brain-dead feature of sharing some of the control lines so that the 18
inch maximum cable length had to be shared between both controllers
(i.e. 9" for primary and 9" for secondary.)
- Posted by Eric Gisin on July 28th, 2003
"Mike Tomlinson" <mike@nospam.jasper.org.uk> wrote in message
news:LEgqGKAuZQJ$Ewsc@nospam.jasper.org.uk...
| In article <bg1tu80g8b@enews2.newsguy.com>, Eric Gisin <ericg@go.to>
| writes
|
| >They are aways electrically independent.
|
| I'm not so sure. I believe that some earlier IDE chipsets had the
| brain-dead feature of sharing some of the control lines so that the 18
| inch maximum cable length had to be shared between both controllers
| (i.e. 9" for primary and 9" for secondary.)
|
Yes, prior to the PIIX4. None had UDMA.
I deleted my PIIX3 data sheet else I would look it up.
- Posted by Rod Speed on July 28th, 2003
Mike Tomlinson <mike@nospam.jasper.org.uk> wrote in
message news:LEgqGKAuZQJ$Ewsc@nospam.jasper.org.uk...
That was a hell of a long time ago now. And
wouldnt produce the effect he is seeing anyway.
Nope. Even if some lines are shared, you dont get that result
either. The distance is due to reflections on an unterminated
cable and so it isnt halved even if some lines are shared.
