Dual path's to scsi disk

Discussion in 'Converters / Interfaces' started by Fozz, Apr 11, 2003.

  1. Fozz

    Fozz Active Member

    Jun 4, 2001
    Williamsville, NY
    Home Page:
    The Korg D1600 is one of those all-in-one units for recording, mixing, CD burning.

    This topic,
    "D1600--SCSI--PC---SCSI---D16000 OK!"
    at http://www.korgboards.com talks about connecting the D1600's scsi port to a PC's scsi port so that D1600 can write to the PC's internal scsi disk:

    This is what I think the guy is describing that works for him:

    D1600 scsi port
    • <font size="2" face="Verdana, Helvetica, sans-serif">cabled to the PC scsi port
    • <font size="2" face="Verdana, Helvetica, sans-serif">which is obviously connected to the PC's internal scsi hard disk
    <font size="2" face="Verdana, Helvetica, sans-serif">
    • <font size="2" face="Verdana, Helvetica, sans-serif">to same internal scsi hard disk
    <font size="2" face="Verdana, Helvetica, sans-serif">
    He has two paths to the same hard disk. I would have thought that there could be problems especially if you accidentally tried to access the scsi disk from your PC while the D1600 was writing to it.

    • <font size="2" face="Verdana, Helvetica, sans-serif">Does this sound like a safe technique?
    <font size="2" face="Verdana, Helvetica, sans-serif">
  2. Opus2000

    Opus2000 Well-Known Member

    Apr 7, 2001
    I've never gotten that scenario to work as the ID's usually never line up properly and they both fight for the right to be the proprietary SCSI master.

    Can't say that I've tried it in the last few years though!

    Maybe someone else can help on that subject


  3. M Brane

    M Brane Guest

    While I know nothing of the Korg, and little of PC's, I do know a bit about SCSI.

    The golden rules of SCSI are:

    Each device on a SCSI bus must have a unique ID#

    Only those devices on each end of the bus are to be, and must be terminated.

    Cheap adapters, terminators & cables are evil.

    Since a SCSI bus is capable of accessing more than one device at a time (unlike IDE) if the above rules are followed it could work.

    Then again, you could also be in SCSI hell! :c:
  4. Kingpin

    Kingpin Guest

    I have connected multiple SCSI drives and 1 cd drive between 2 PC computers before and it worked without a hitch. I made sure that both SCSI controllers used different ID's. They just looked like local drives on both machines. It was kinda eery! Dont be afraid to experiment. The reason I did this was because it was slow at work one day, and the question, "is that possible?" popped in my head. :)
  5. pan

    pan Guest

    Put an active Terminator at each end of the SCSI-chain - terminating the drives would interrupt the chain.

  6. Fozz

    Fozz Active Member

    Jun 4, 2001
    Williamsville, NY
    Home Page:

    Are there two kinds of terminators that one would look for:
    - active
    - inactive
  7. M Brane

    M Brane Guest

    Active is better. Granite Digital makes high-quality SCSI accessories. Yeah they're a bit pricey, but if you've ever dealt with the SCSI voodoo caused by cheap cables, terminators ect. you know it's better to buy the good stuff and get to work than spend hours chasing down wierd SCSI problems and losing your data.

    The reason for termination is to prevent data from being reflected back down the cable when it reaches the end/last device. The host provides term at it's end, so the question is if the Korg provides term as well. If not it cannot be on the end of the chain.

    Remember that SCSI voodoo? I've seen improperly configured SCSI chains that worked fine for years, then one day just go haywire. Bizarre errors and behavior. Appearing/disappearing devices, all kinds of wierd $hit. Making sure you have good stuff that's hooked up right is most of the battle.
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