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Howard Kaikow
Guest
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 Posted: Sun Jun 03, 2007 12:04 am Post subject: Backward compatibility and the cable |
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Most SCSI drives are alleged to be backwards compatible, so if one connects
an Ultra320 drive to a card not capable of Ultra320, in this case, an
Adaptec 2940UW, the drive will drop down to the capabilities of the card.
But, can the cable matter?
If the 2940 recognizes the drive, but errors in verifying the drive, might
it be necessary to upgrade to a 68 pin cable that can handle ultra 320, even
tho the 2940 does not handle Ultra320? |
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Howard Kaikow
Guest
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| Posted: Sun Jun 03, 2007 1:52 pm Post subject: Re: Backward compatibility and the cable |
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"wolfgang schneider" <schnusi@gmx.net> wrote in message
news:MPG.20cccea78d24fd7998971b@news.individual.de...
| Quote: | hi ,
the better the cable the more good is transport . the error is produced
somewhere else - term. , drive , controller , induction ...
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Thanx.
I'm getting a replacement drive this week.
So, I guess I do not need to replace the cable. |
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wolfgang schneider
Guest
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| Posted: Sun Jun 03, 2007 1:52 pm Post subject: Re: Backward compatibility and the cable |
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hi ,
the better the cable the more good is transport . the error is produced
somewhere else - term. , drive , controller , induction ...
In article <f3sf01$14mq$1@pyrite.mv.net>, kaikow@standards.com says...
| Quote: | Most SCSI drives are alleged to be backwards compatible, so if one connects
an Ultra320 drive to a card not capable of Ultra320, in this case, an
Adaptec 2940UW, the drive will drop down to the capabilities of the card.
But, can the cable matter?
If the 2940 recognizes the drive, but errors in verifying the drive, might
it be necessary to upgrade to a 68 pin cable that can handle ultra 320, even
tho the 2940 does not handle Ultra320?
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--
gravity is still active
-<--@
gruss , wolfgang |
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Folkert Rienstra
Guest
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| Posted: Mon Jun 04, 2007 10:17 pm Post subject: Re: Backward compatibility and the cable |
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"wolfgang schneider" <schnusi@gmx.net> wrote in message news:MPG.20cccea78d24fd7998971b@news.individual.de
| Quote: | hi ,
the better the cable the more good is transport .
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Clueless, as always.
| Quote: | the error is produced somewhere else -
term. , drive , controller , induction ...
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wrong, true, wrong, wrong.
It's just the drive itself, reporting verify errors.
No data is actually transferred.
| Quote: |
In article <f3sf01$14mq$1@pyrite.mv.net>, kaikow@standards.com says...
Most SCSI drives are alleged to be backwards compatible, so if one connects
an Ultra320 drive to a card not capable of Ultra320, in this case, an
Adaptec 2940UW, the drive will drop down to the capabilities of the card.
But, can the cable matter?
If the 2940 recognizes the drive, but errors in verifying the drive, might
it be necessary to upgrade to a 68 pin cable that can handle ultra 320, even
tho the 2940 does not handle Ultra320? |
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Folkert Rienstra
Guest
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| Posted: Mon Jun 04, 2007 10:25 pm Post subject: Re: Backward compatibility and the cable |
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"Howard Kaikow" <kaikow@standards.com> wrote in message news:f3ue4l$1l8b$1@pyrite.mv.net
| Quote: | "wolfgang schneider" <schnusi@gmx.net> wrote in message news:MPG.20cccea78d24fd7998971b@news.individual.de...
hi ,
the better the cable the more good is transport . the error is produced
somewhere else - term. , drive , controller , induction ...
Thanx.
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That is a thanks with 5 fingers spread vertically before
head at 90 degrees angle, thumb pointing towards nose, right?
| Quote: |
I'm getting a replacement drive this week.
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So why did you ask. Apparently you already decided where the fault was.
| Quote: | So, I guess I do not need to replace the cable.
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Nope. Not for those verify errors anyway. |
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Folkert Rienstra
Guest
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| Posted: Mon Jun 04, 2007 10:29 pm Post subject: Re: Backward compatibility and the cable |
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"Howard Kaikow" <kaikow@standards.com> wrote in message news:f3sf01$14mq$1@pyrite.mv.net
| Quote: | Most SCSI drives are alleged to be backwards compatible,
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Most, as in: excluding HVD.
| Quote: | so if one connects an Ultra320 drive to a card not capable of Ultra320,
in this case, an Adaptec 2940UW,
the drive will drop down to the capabilities of the card.
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No, the controller will not negotiate higher modes than it can handle.
As for LVD, yes, the drive will drop back to SE mode provided that
the diffsens signal is connected to the drive, which it should with any
standard flat cable.
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But, can the cable matter?
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It shouldn't with internal cables.
However some external cables or cable convertors may not have a full com-
plement of wires and the drive may not automatically revert to SE mode.
In which case the controller will not recognize it at all.
| Quote: |
If the 2940 recognizes the drive, but errors in verifying the drive, might
it be necessary to upgrade to a 68 pin cable that can handle ultra 320, even
tho the 2940 does not handle Ultra320?
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Nope, it should handle fine.
Verify errors are drive internally generated errors.
Did you write to the drive before you did the Verify? |
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