Re: Best strategy hard drive swapping?
- From: "J. Clarke" <jclarke.usenet@xxxxxxxxxxxxxxxx>
- Date: Wed, 13 Jul 2005 20:54:01 -0400
HaHaHoHoHeeHee wrote:
> on 12 Jul 2005, "Rod Speed" <rod_speed@xxxxxxxxx> wrote in
> news:3jj9kdFq3pcbU1@xxxxxxxxxxxxxx:
>
>> overload@xxxxxxxxxxxx wrote
>>> HaHaHoHoHeeHee <HaHaHoHoHeeHee_fake@xxxxxxxxx> wrote
>>
>>>>>> Well it makes some sense to me since the IDE interfaces are
>>>>>> so touchy
>>
>>>>> IDE interfaces are NOT "so touchy".
>>
>>>>>> such that adapters and longer cables are not recommended.
>>
>>>>> Good 24 inch cables, while not in spec, generally work.
>>
>>>> It is amazing to me that the recommended limit is
>>>> 18 inches and even given that 24 inch cables might
>>>> work, that shows how touchy the IDE interface is.
>>
>> True.
>>
>>>> Or maybe it's the MBs themselves
>>
>> Nope.
>>
>>>> or general design.
>>
>> Yep. IDE went with unterminated drives for the simplicity
>> with those and a simple flat ribbon cable for the same reason.
>>
>> That was later improved with 80 wire cables with
>> a ground wire between each signal wire, but that
>> doesnt help with the length, just the speed.
>>
>>>> Point is that the whole standard is rather flaky if
>>>> at electron speeds they cannot design cables/etc
>>>> that can be extendable for reasonable lengths.
>>
>> They can but chose not to. It was only intended for
>> internal use and the simplicity of unterminated drives.
>>
>>> The problem is electron speed.
>>
>> Nope.
>>
>>> Electrons flowing through wires generate an
>>> induced magnetic field that effects other wires.
>>
>> Nothing to do with electron speed,
>> thats the rise time of the signal edges.
>>
>>> Better (not IDE) cables use twisted pairs and
>>> differential signaling so that any induced signals affect
>>> both sides of the signal oppositely and cancel out.
>>
>> Correct. But that has nothing to do with electron
>> speed which is the same in both types of cable.
>>
>>> Flat cables don't work well at high speeds.
>>
>> Well enough if they arent too long.
>>
>
> So, the suggestion of the fellow who recommended round cables, is
> that worth pursuing. IOW is there any way I can run any type of
> cable that would be long enough, say around 3-4 feet so that I
> could hook up drives on that ide cable outside the box? Sorry if
> that's a dumb question,but my background in digital electronics is
> limited.
Round IDE cables are usually flat cables that have been hacked up and
wrapped in a piece of tubing. You won't get any more distance out of them
than flat cables and they're more out of spec than any halfway decent caddy
would ever be. Their main utility is to make geek-chic machines with
windows in the side look k3w1 to wannabees and provide a good laugh to
ubergeeks.
If you want more span then you need to go to a different signalling
method--you can get an SATA-to-PATA bridge or a Firewire bridge or a USB2
bridge, all of which will allow you longer cables than standard PATA, but
you'll then have the bridge to contend with which can introduce problems of
its own.
--
--John
to email, dial "usenet" and validate
(was jclarke at eye bee em dot net)
.
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