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Old November 9th 14, 12:34 AM posted to alt.windows7.general,comp.sys.ibm.pc.hardware.storage
Rod Speed
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Posts: 8,559
Default "BIOS problem" solved

Brian Gregory wrote
Rod Speed wrote
J. P. Gilliver (John) wrote
Rod Speed wrote


I've never had a problem with my samsungs.


Sounds painful!


Nope, completely painless.


Any of the small molecular weight alcohols are fine.


The SATA cable should not be bent until it kinks.


That's true of any signal cable like that.


This has an impact on the dielectric insulation inside the cable.
And can change the cable impedance.


Cable impedance just isnt a problem with digital signals.


If it wasn't, you wouldn't be worrying about kinks above.


I don't worry about kinks above.


It's an analogue world


Nope.


- especially at the sort of frequencies we work at these days.


Not in the sense that the cable impedance matters.


But even back in the days of 10 megabit ethernet, impedance was
relevant (75 ohm coax, IIRR). That's why, ideally, you had terminators.


But PATA didn't and SATA doesn't either.


I'm sure SATA does have terminators,


But not impedance matching terminators in the sense he is talking about.

it's just that they're built in to the devices at the ends of the cable,
and there are no devices connected anywhere in the middle of the cable.


Not in the sense of impedance matching he is talking about.

SATA data cables are too short for that approach to be needed.

My understanding is that PATA does too


No it does not, and they arent coax either.

but that they're not terminated very precisely,


Neither is SATA.

so that whether you have one drive or two it still works "well enough".


They don’t do impedance matching
in the sense he is talking about.

And when you have just the motherboard on
one end and a drive on the middle connector,
and nothing on the end connector, that end
connector isnt even terminated at all.