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  #1  
Old 04-20-1999, 03:17 AM
Andy H Andy H is offline
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Location: Allershausen, Germany
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Default Seagate HD settings

Hi Steve,

I really appreciate that new forum. It's good to have a specialist to talk to
Well, maybe you can help me on this one...

I have a Seagate Barracuda connected to my Pro Tools Mix System and I'd like to swap the disk to a Sonic Solution system and vice versa. Everything seems to be fine, but there's a special setting necessary on the hard drive to have it working with sonic: it's the "DATA TRANSFER DISK CONNECT" jumper, default setting to '0' (off), but it has to be activated for sonic.
As soon as I connect the HD to the Mac (8.1), the drives won't mount or won't be seen any more.
Could you gimme a clue on this?
Thanks a lot in advance!
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  #2  
Old 04-21-1999, 05:00 PM
Florian Florian is offline
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Default Re: Seagate HD settings

Steve,
...i hope you got a nice corner office with a good view...

I have a related seagate question that i can't seem to figure out with the manual:

I installed a seagate 118273 lw inside a 9500 with 50pin to 68 adapter.
i supposed i should remove the termination jumper from the other internal drive now, since it no longer is the last device and instead terminate the new saegate at the end of the chain.
So i jumper-terminate the new seagate.
So far so good.

however:
if i remove the term jumper from the other drive, (an ibm dors 32160 narrow), the system wont boot. So i left it on.

But now i'm terminating twice and it works? ??
Weird. Or is the fact that im using a 50to68 adapter the reason that i have to terminate twice to make it work?

Florian
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  #3  
Old 04-21-1999, 05:43 PM
Steve Rosenthal Steve Rosenthal is offline
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Default Re: Seagate HD settings

Hi Florian,

...i hope you got a nice corner office with a good view...

You must be psychic!

I installed a seagate 118273 lw inside a 9500 with 50pin to 68 adapter. i supposed i should remove the termination jumper from the other internal drive now, since it no longer is the last device and instead terminate the new saegate at the end of the chain. So i jumper-terminate the new seagate. So far so good.

Hmmm... This is strange. LVD drives don't have termination jumpers on them -- at least not the ones I've seen. This is because they can run either in single-ended mode or LVD mode, and the termination requirements change depending on the mode.

This is a new Seagate, judging from the model number, so maybe they've changed something. My guess is, however, that your jumpering the Termination Power on the drive.

Two minutes later...

Okay, just went to the Seagate website and here's the deal:

"Note: WD, DC, LW and LC drives do not have internal terminators or any other way of adding internal terminators to the drive; use external active termination if required. Use active (ANSI SCSI-2 Alternative 2) terminators when terminating the bus. Use active negation terminators when terminating a SCSI Ultra2 bus operating in Low Voltage Differential (LVD) mode."

So, what you need to do is get a narrow, active terminator for the internal bus and place it on the last physical node of the ribbon cable, keeping the narrow drive first (closest to the motherboard), and the LW drive second (closest to the terminator).

Check Granite ([url]http://www.scsipro.com[/i]) for such an adapter (50-pin IDC).
however:
if i remove the term jumper from the other drive, (an ibm dors 32160 narrow), the system wont boot. So i left it on. But now i'm terminating twice and it works? ??


Based on the above information, it appears you're actually only terminating once, but it's in the middle of the chain.

Weird. Or is the fact that im using a 50to68 adapter the reason that i have to terminate twice to make it work?

Same as above.

You're initial thinking was right: Since the LW drive is last on the chain, it should be terminated -- or have a terminator come after it.

--Steve Rosenthal, Digidesign ETS
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  #4  
Old 04-25-1999, 01:24 AM
Mike Thornton's Avatar
Mike Thornton Mike Thornton is offline
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Default Re: Seagate HD settings

We have a client that uses Seagate Barracudas between a Sonic System and Protools and of course SAonic doesn't see a Protools (Mac) formatted drive. Sonic uses its own formatting style but as soon as the drive is reformatted with the Sonic utility all is well. Never had to change any jumpers to get it to work on Sonic.


Hope that helps,


Mike Thornton (One Stop Digital (OSD) Ltd
www.osd-uk.com
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  #5  
Old 04-25-1999, 10:01 AM
Steve Rosenthal Steve Rosenthal is offline
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Default Re: Seagate HD settings

Thanks Mike.

I'm not familiar with Sonic Systems, but you bring up a great point.

If Sonic uses a system-exclusive file format, then I don't know what you'd do for interchange, because that's an OS level issue, not a hardware issue -- which is what jumpers control.

--Steve Rosenthal, Digidesign ETS
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