Fluoxetine 10mg capsules

Silencing hard drives, optical drives and other storage devices

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SlaveToSilence
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Fluoxetine 10mg capsules

Post by SlaveToSilence » Mon Jan 05, 2009 7:40 am

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Last edited by SlaveToSilence on Thu Apr 22, 2010 3:14 pm, edited 1 time in total.

Sylph-DS
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Post by Sylph-DS » Mon Jan 05, 2009 7:46 am

good luck soldering 40 individual strands. I don't reckon it's even soldered to begin with.

What you could try is cutting off the long end, leaving only the two ends you would normally stick into the drives.

SlaveToSilence
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Post by SlaveToSilence » Mon Jan 05, 2009 7:52 am

brilliant idea! will give it a go sometime, ensuring none of the cut ends can short
Thanks :D

Sylph-DS
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Post by Sylph-DS » Mon Jan 05, 2009 7:58 am

I'd try just using those two connectors without the one on the long end before cutting into it. Unless of course you have a ton of cables lying around ;)

SlaveToSilence
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Post by SlaveToSilence » Mon Jan 05, 2009 7:59 am

i have a few lol but will try that anyway, hopefully it will work :P

QuietOC
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Re: Is it possible to shorten an IDE cable? (cut and solder?

Post by QuietOC » Mon Jan 05, 2009 9:14 am

SlaveToSilence wrote:the back of my dvd rom drive is like an inch from my ide connector on the motherboard, so instead of buyin an sata drive would it be possible to cut a ribon cable and resolder it so that its only about 2-3inches long? or even better is there somewhere i could buy one that short?
No soldering is required. The standard connectors have little blades that cut into the cable. The biggest trouble is getting the connectors apart. Once apart you can just squeze it together again wherever you want it on the cable, and trim the excess. I normally end up breaking at least one of the tabs that is supposed to hold the connector together.

The 80 wire cables are a big pain. Plus there is one of the ground wires that needs to be cut which is used as sense otherwise you'll only get ATA-33 mode (the same as 40 pin cable.) So if you cut the long part of the 80 wire cable off and just use the two close connectors you will have removed this cut sense wire and so get ATA-33 mode. :P

bgiddins
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Post by bgiddins » Mon Jan 05, 2009 12:03 pm

You can buy short cables as well - Google around for them. I have a 5" AC Ryan round IDE cable for my optical drive. Frees up a SATA port.

Tephras
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Post by Tephras » Mon Jan 05, 2009 5:23 pm

There is a good thread on how to modify an IDE cable here, at the end of the thread there's a link to this detailed guide on how to reposition a connector.

SlaveToSilence
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Post by SlaveToSilence » Mon Jan 05, 2009 5:25 pm

awesome, thanks, exactly what i've been looking for! :D

NeilBlanchard
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Post by NeilBlanchard » Tue Jan 06, 2009 10:04 am

Hi,

You can always buy a shorter cable.

The impedance of the IDE cable is pretty critical, and if you don't do it right -- you can corrupt the data and the hard drive will be toast.

SlaveToSilence
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Post by SlaveToSilence » Tue Jan 06, 2009 10:07 am

NeilBlanchard wrote:The impedance of the IDE cable is pretty critical, and if you don't do it right -- you can corrupt the data and the hard drive will be toast.
could you elaborate?

NeilBlanchard
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Post by NeilBlanchard » Tue Jan 06, 2009 10:18 am

Hi,

There are actually 80 wires in today's IDE cables, BTW -- every other wire is a ground, to try and better protect the data integrity.

The reason we have now changed over to SATA drives, is the IDE interface could not be pushed any faster. The 40 signal wires carry all the "bits" in parallel, and the time window is very tight -- all the bits must arrive at the end of the cable within a very short period of time. Any difference in impedance affects the timing, and if any one of the bits is too slow, then the entire data set is corrupted, and then the hard drive will be ruined.

I think you should just buy a shorter IDE cable.

SlaveToSilence
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Post by SlaveToSilence » Tue Jan 06, 2009 10:20 am

very interesting, thanks, what about the idea of just using the two closer together plugs on a 3 plug (2 drive 1 mobo) cable? could that cause any damage?

edh
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Post by edh » Tue Jan 06, 2009 10:33 am

SlaveToSilence wrote:what about the idea of just using the two closer together plugs on a 3 plug (2 drive 1 mobo) cable? could that cause any damage?
That worked fine for me. Just cut off the extra cable with something sharp so it's a tidy end. I've actually seen a few cables in pre-built systems that seem to have been done like this.

SlaveToSilence
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Post by SlaveToSilence » Tue Jan 06, 2009 10:36 am

great, i can have an optical drive again lol not had it in for a while because of the big stupid cable (airlflow) however i dont know how im gunna power it, there is not a single molex connector in the entire upper chamber in my p180! (well, one for the motherboard :lol:)
cable management :twisted:

QuietOC
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Post by QuietOC » Tue Jan 06, 2009 10:53 am

NeilBlanchard wrote:The impedance of the IDE cable is pretty critical, and if you don't do it right -- you can corrupt the data and the hard drive will be toast.
The impedance of a ribbon cable is constant regardless of length.

edh
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Post by edh » Tue Jan 06, 2009 1:16 pm

QuietOC wrote:The impedance of a ribbon cable is constant regardless of length.
I would have thought that the impedence would be proportional to the length as it is the resistivity which affects impedence and this is proportionally inverse of the length. What else affects it?

cmthomson
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Post by cmthomson » Tue Jan 06, 2009 1:36 pm

QuietOC wrote:
NeilBlanchard wrote:The impedance of the IDE cable is pretty critical, and if you don't do it right -- you can corrupt the data and the hard drive will be toast.
The impedance of a ribbon cable is constant regardless of length.
Well, it's not quite as simple as either of these statements. A ribbon cable becomes a transmission line (and therefore has constant impedance) once it is long enough (> 1/4 of the wavelength). In the case of IDE cables, I recall this is lengths over about 8 inches. More important, though, is how the cable is terminated. The connector must be at or very near the end of the cable so that there are no reflections off the end of the cable. In other words, if you shorten a cable by moving the connector, you must cut off the unused part of the cable. If you have multiple connectors on the cable and are using only one, use the one at the end.

The challenge with moving a connector on an existing cable is two-fold: the connector is designed to be used only once, so it is hard/impossible to take it apart without breaking it, and it may not make as clean a connection with the wires when applied the second time. The latter can result in poor signal integrity or even no-connects.

If your cable is messed up, it will result in data errors (flagged as ECC errors in SMART). It won't kill your disk, but it will either slow it way down due to retries, or make it effectively unusable (with that cable).

BTW, a more likely source of ECC errors in flat IDE cables is cross-talk caused by improper folding of the cable. Make sure no wires have substantial parallel runs. In other words, never fold a cable along its length; instead fold it diagonally so that the wires cross each other at 90 degree angles and don't have parallel runs. The worst possible fold is one that runs along the cable as opposed to across the cable.

cmthomson
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Post by cmthomson » Tue Jan 06, 2009 2:03 pm

edh wrote:
QuietOC wrote:The impedance of a ribbon cable is constant regardless of length.
I would have thought that the impedence would be proportional to the length as it is the resistivity which affects impedence and this is proportionally inverse of the length. What else affects it?
The resistance of an IDE cable is extremely low and wouldn't be a factor unless the cable was so long that the voltage drops below the sensor threshold; this would be a very long cable (> 10 feet?).

The impedance of a cable (or PCB trace) is dominated by the capacitance between the signal line and its adjacent ground return line. This is determined by the dimensions of the conductors, the distance between them, and the capacitance of the dielectric that separates them. Most PCBs have 50-Ohm impedance based on the width of the signal traces and the distance to the nearest ground plane. Cables typically range between 50 and 100 Ohms, based mostly on the spacing between the signal and ground wires (typically the cable is organized as GND-SIG-GND-SIG-GND-etc.)

A signal/ground pair of conductors becomes a transmission line when it is more than a few inches long and has a constant capacitance between the lines and constant inductance of the conductors. A ribbon cable has both characteristics.

What it means to be a transmission line is that a sharp voltage change (a digital switch from 1 to 0 or back) propagates down the line as a wavefront with a more-or-less constant shape. This stops being true when there is a change in the capacitance/inductance, for instance due to a substantial separation of the signal and ground lines. But more important practically, it stops being true at the end of the line if there is no terminating resistance or the resistance differs substantially from the impedance of the line. This is what happens if there is extra cable beyond the connector attached to the disk. The result is reflections and distortions of the wavefront, sometimes nasty enough to cross the 0/1 voltage threshold.

Tamas
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Re: Is it possible to shorten an IDE cable? (cut and solder?

Post by Tamas » Wed Jan 07, 2009 12:44 pm

SlaveToSilence wrote:the back of my dvd rom drive is like an inch from my ide connector on the motherboard, so instead of buyin an sata drive would it be possible to cut a ribon cable and resolder it so that its only about 2-3inches long? or even better is there somewhere i could buy one that short?

Thanks guys :D
I've just bought two short (single drive) IDE cables from Florida, because I'm bored with these lenghty 45cm cables.

Here is the shop (they ship to Europe): http://www.performance-pcs.com/catalog/ ... ts_id=1637

SlaveToSilence
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Post by SlaveToSilence » Thu Jan 08, 2009 8:33 am

well a hard drive works when plugged into the motherboard with the two closer together connectors which is good, going to try the dvdrw now

SlaveToSilence
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Post by SlaveToSilence » Thu Jan 08, 2009 10:47 am

dvdrw working too having cut off the long half of the wire
now have an ide dvdrw with neatly folded ide cable (ooold flat grey style) now affecting airflow :D

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