2 types of IDE connectors?

I used to have old IDE hard disks that used the old IDE connectors. I noticed the new hard disks I bought recently come with IDE that have thinner(?) threads. I wonder what is the difference between the two?
Since I tried both types of connectors with the old and the new hard disks and they all seem to work fine.
VolgaAsked:
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sirbountyCommented:
The 'newer' one is your 80-wire IDE calbe (40 additional ground).
It's for ATA66/100  technology
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sirbountyCommented:
Yes - the connectors are the same however.
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sirbountyCommented:
AKA Ultra DMA...
Here's a good info link: http://www.pcguide.com/ref/hdd/if/ide/confCable80-c.html
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Glen A.IT Project ManagerCommented:
no, it's not AKA UltraDMA.  UltraDMA came about before the 80pin cable.  (UDMA started @ UDMA33)
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Glen A.IT Project ManagerCommented:
FYI - UltraATA 100 and faster cables require a special 40pin connector with 80pin ribbon cable.  They usually have blue ends on them and are lablelled for computer / master / slave connectors.  You can most easily tell by counting the individual lines in the ribbon cable -  If there's only 40, it's standard IDE.  If it's got 80, it's for ATA100 and above.
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Glen A.IT Project ManagerCommented:
And yes, the 80pin cables reduce noise -  what they actually do is eliminate crosstalk.  There are 40 ground cables (as sirbounty suggested) interspersed between the 40 regular connector cables.  This is to reduce crosstalk and improve the signal clarity, thus ensuring the fastest possible transfer speeds.

 everything you ever wanted to know about the difference between 40pin and 80pin (including good quality photos) is available here:

http://www.pcguide.com/ref/hdd/if/ide/confCable80-c.html

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Glen A.IT Project ManagerCommented:
>>It's for ATA66/100  technology

Not correct.  As stated, it is required for ATA100, but not ATA66
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_Commented:
I won't disagree with you AB, ( until I can find the article ), but I was under the impression that it was 66/100/133 also.  Until such time, I thank you for the correction.   : )
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Glen A.IT Project ManagerCommented:
You can use it for 66/100/133, but it wasn't necessary until the higher transfer rates of 100.  Much like you can use Cat6 network cable with your 10/100 network, but don't NEED it until you move to Gigabit ethernet.  Same type of situation with cable specs being different to eliminate crosstalk.
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Glen A.IT Project ManagerCommented:
lol, and I posted the same link as sirbounty (I took it from one of my comments in a paq on the same subject) sorry sirbounty, didn't see you posted it first.
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Glen A.IT Project ManagerCommented:
And, I've found some manufacturers of IDE controllers that claim they will not work at ATA66 unless an 80pin cable is used, so again, I must apologize.  Although it's not always required for ATA66, for some manufacturers it is, and as such, erring on the side of caution makes sense and the rule of thumb should be to use it.

Again, sorry for the confusion.  I think I need to go to bed now.  Too many late nights on work projects have made me both stupid and grumpy.
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_Commented:
LOL  It is still good to know about the 66 differents in specs.  I am crashing also. Good night.
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pegasysCommented:
I rekcon it could be a SCSI device, or one of the new 'serial' harddrive cables (not that I've personally seen one)...
If there are jumpers on it, marked with 0123 (as in Jumper 1, jumper 2, jumper 3 etc...) then its a scsi harddrive. There should be another jumper marked term/terminate...
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sirbountyCommented:
Sorry 'bout the confusion.  I was trying to convey to Volga that those specs mentioned could be used with the 80-pin cable.
Volga - these 80-pin cables will also work with your IDE cd-rom(s).

Pegasys - I got a mbo with the SATA cables - they're tiny plastic, red cables.  Wish I'd gotten a SATA hd so I could try it out. . .one day
Scsi cables are wider, I believe.  I think it's 50 & 68 wires for SCSI and the connector wouldn't fit an IDE device
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Glen A.IT Project ManagerCommented:
Not SCSI, pegasys, it's IDE.  68pin is the standard for SCSI.  There are 80pin drive connectors for SCSI, but they are for the hot-swappable type of SCSI drives, with power and SCSI in the same connector.
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Glen A.IT Project ManagerCommented:
And those connectors I spoke of are built into the drives themselves, fyi.
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