Difference between IDE and SCSI ??

[Peter Larsen]

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Tim wrote:
> On Sat, 2008-02-02 at 11:57 -0800, Les wrote:
>> SCSI is a serial system, or at least it can be.
> 
> Pardon?  Usually, when one has a data bus for several parallel data
> lines at once, one refers to it as parallel.
> 
> Serial - one data line, that sends bits sequentially.
> Parallel - several data lines, that send bits simultaneously.
> 
> The most usual way of finding SCSI used with drives was as a parallel
> bus, anywhere from 25 to 50 pins per connector.

No longer. SAS = Serial SCSI. I can barely get any high-end servers
delivered without SAS anymore. The hardware is cheaper and simpler to
produce than parallel. Also, you have each device on their own line -
just like with SATA. A cable error no longer renders the whole 15
devices useless.

- --
  Peter Larsen
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