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SCSI problems - Mac Applications & Software

On 8/4/03 1:35 PM, in article WyyXa.871$server.ntli.net, "Adrian Bright" <com> wrote:   You don't want all of your SCSI devices terminated. Only the 1st and last device need termination. The first device is usually the internal HD and it is already terminated in the controller card, so just make sure the last device on the SCSI chain is terminated....

  1. #1

    Default Re: SCSI problems

    On 8/4/03 1:35 PM, in article
    WyyXa.871$server.ntli.net, "Adrian Bright"
    <com> wrote:
     

    You don't want all of your SCSI devices terminated. Only the 1st and last
    device need termination. The first device is usually the internal HD and it
    is already terminated in the controller card, so just make sure the last
    device on the SCSI chain is terminated.

    Robert Guest

  2. #2

    Default Re: SCSI problems

    Adrian Bright wrote: [/ref]
    > with [/ref]
    > back [/ref]
    > all 
    > >
    > > You don't want all of your SCSI devices terminated. Only the 1st and last
    > > device need termination. The first device is usually the internal HD and[/ref]
    > it 
    >
    > This is the case, it's terminated at the end but just want to work
    > again..think that I have corrupted a preference file or something......[/ref]

    Hi.

    Does Apple System Profiler see the SCSI card??

    Bob W
    Bob Guest

  3. #3

    Default Re: SCSI problems

    Robert Jennings <gov> writes: 

    Half right.

    You need to terminate the two ends of the bus. If you have both
    internal and external drives, then one end is the end of the internal
    cable and the other end is the end of the external cable.

    If you have only internal devices, then terminate the drive at the
    end of the cable (or the end of the cable itself) and the host
    adapter (which may be your motherboard.)

    If you have only external devices, then terminate the drive at the
    end of the cable and the host adapter.

    If you have both internal and external, then terminate the drive at
    the end of each cable and do _NOT_ terminate the host adapter.

    Many host adapters are designed to detect this situation and
    automatically turn internal termination on or off as required. But
    some don't, and some that claim to don't work properly. There is
    usually a way to override any automatic termination features, but the
    mechanism will be specific to your host adapter. (The Adaptec card
    in my PC has a ROM program that is activated by typing CTRL-A during
    the boot sequence. I don't know what the usual mechanism is for Mac
    adapters.)

    -- David
    David Guest

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