🚀 go-pugleaf

In article <829083915snz@longley.demon.co.uk>
           David@longley.demon.co.uk "David Longley" writes:

> I have just substituted a Barracuda ST15150ND for the 2.1GB barracuda 
> I had running off the AHA2940 I had in my machine. After a brief flash
> of the drive's green LED and the sound of the disk starting, it seems
> to go no further. The AHA2940 does not see the drive.
> 
> Supposedly a new drive.......anyone with any helpful suggestions?
> 
> I have a nasty feeling about the ND!! Is this a "differential" rather than
> "narrow"? IF so, what can I do about it?
> -- 
> David Longley
> 
If so - I *assume* that's why it isn't working on my AHA2940. What *will*
it work on, and why is there a "differential" version? What PC controllers
are there which work with such drives..?


-- 
David Longley

David Longley wrote:
> 
> In article <829083915snz@longley.demon.co.uk>
>            David@longley.demon.co.uk "David Longley" writes:
> 
> > I have just substituted a Barracuda ST15150ND for the 2.1GB barracuda
> > I had running off the AHA2940 I had in my machine. After a brief flash
> > of the drive's green LED and the sound of the disk starting, it seems
> > to go no further. The AHA2940 does not see the drive.
> >
> > Supposedly a new drive.......anyone with any helpful suggestions?
> >
> > I have a nasty feeling about the ND!! Is this a "differential" rather than
> > "narrow"? IF so, what can I do about it?
> > --
> > David Longley
> >
> If so - I *assume* that's why it isn't working on my AHA2940. What *will*
> it work on, and why is there a "differential" version? What PC controllers
> are there which work with such drives..?
> 
> --
> David LongleyDear David,
    There are adapters that you can buy to adapt your differential drive 
to the single ended interface.  These are pretty inexpensive.  If you 
are interested then e-mail or give me a call.

Regards,


William Moyer		PH# 408/438-4986
Account Manager		FX# 408/438-3459
U.S. Meltek, Inc.	MAILTO:bill@us.meltek.com
3 Victor Square		WWW: http://www.meltek.com
Scotts Valley, CA 95066

David Longley wrote:
> 
> I have just substituted a Barracuda ST15150ND for the 2.1GB barracuda
> I had running off the AHA2940 I had in my machine. After a brief flash
> of the drive's green LED and the sound of the disk starting, it seems
> to go no further. The AHA2940 does not see the drive.
> 
> Supposedly a new drive.......anyone with any helpful suggestions?
> 
> I have a nasty feeling about the ND!! Is this a "differential" rather than
> "narrow"? IF so, what can I do about it?
> --
> David Longley

Yes, the N stands for SCSI (not narrow) the D stands for differential. You
cannot connect a differential device to a single-ended controller as the
electrical signals are quite different. You must either get a single ended
Barracuda (type ST15150N) or a differential controller (I'm not sure if
Adaptec has them, look at their WWW site). I don't know your specific needs,
but unless you have to have differential for the extra cable-length, you
should stick to single-ended. It's much easier to get hold on and cheaper
as well.

The typenumbering scheme of SEAGATE is as follows:


  +----- Seagate              +----------- PR = Paired Solution. Drive shipped
  |   +- Technology           |            with menu driven installation soft-
+---+---+---+---+---+---+---+----+---+---+ ware. Seagate controller or host
| S | T | 1 | 4 | 8 | 0 | A | PR | - | X | adapter included with disc drive.
+---+---+---+---+---+---+---+----+---+---+
          |   |   |   |   |        |   |
          |   +---+---+   +--------+   +-- Access Time 0 = Standard/1 = Faster
          |       |                |
 +--------+       +----------+     +----------------+
 FORM FACTOR                 MBytes                 INTERFACE
+---------------------------+----------------------+-------------------------+
|1xxx = 3.5"                |Unformatted (approx.) |Unspecified = ST412/MFM  |
|     half-height (41 mm)   |e.g. ST225 is 25      |N  = SCSI                |
|2xxx = 5.25"               |unformatted MBytes    |R  = ST412/RLL           |
|     half-height (41 mm)   +----------------------+A  = AT Bus (IDE)        |
|3xxx = 3.5"                |                      |X  = XT Bus (IDE)        |
|     1-inch high (25 mm)   |                      |E  = ESDI                |
|4xxx = 5.25"               |                      |J  = SMD/SME-E           |
|     full-height (82 mm)   |                      |K  = IPI-2               |
|6xxx = 9-inch              |                      |ND = Differential SCSI   |
|8xxx = 8-inch              |                      |NM = Mac Compat. SCSI    |
|9xxx = 2.5"                |                      |S  = Synchronized Spindle|
|     .75-inch high (19 mm) |                      |V  = NetWare Ready       |
+---------------------------+                      |P  = Write Pre-Comp      |


-- 
+------------------------------------------------------+
| Signature of: Jouke Numan  <jnuman@hiscom.nl>        |
| HISCOM bv, department of Systems Development         |
| Schipholweg 97, 2316 AX  Leiden, the Netherlands     |
| +31-71-5256757 (office) +31-71-5216675 (FAX)         |
+------------------------------------------------------+

David Longley <David@longley.demon.co.uk> wrote:

>I have just substituted a Barracuda ST15150ND for the 2.1GB barracuda 
>I had running off the AHA2940 I had in my machine. After a brief flash
>of the drive's green LED and the sound of the disk starting, it seems
>to go no further. The AHA2940 does not see the drive.
>Supposedly a new drive.......anyone with any helpful suggestions?
>I have a nasty feeling about the ND!! Is this a "differential" rather than
>"narrow"? IF so, what can I do about it?

-----------
David,

exactly so.... ND is a differential drive, so if there's _any_ chance,
substitute it by a 15150N, or, if not, you'll need a
differential-to-SingleEnded converter ....

Gerhard

for converters, you might check with 

Applied Concepts, Inc.
        Wilsonville, OR
        phone           (503) 685-9300
        www-server      www.apcon.com

APS Technologies
        6131 Deramus, Kansas City, MO 64120
        phone           (800) 235-2753, (816) 373-5800
        email           service@apstech.com
        www-server      www.apstech.com

I-Tech Corp.
        phone           (612) 941-5905
        fax             (612) 941-2386
        email           fibre_channel@i-tech.com

Rancho Technology
        8632 Archibald Ave, #109, Rancho Cucamonga, CA 91730
        phone           (714) 987-3966
        fax             (714) 989-2365

In article <316B73A4.167E@hiscom.nl>, Jouke Numan  <jnuman@hiscom.nl> wrote:
>
>The typenumbering scheme of SEAGATE is as follows:
>
>
>  +----- Seagate              +----------- PR = Paired Solution. Drive shipped
>  |   +- Technology           |            with menu driven installation soft-
>+---+---+---+---+---+---+---+----+---+---+ ware. Seagate controller or host
>| S | T | 1 | 4 | 8 | 0 | A | PR | - | X | adapter included with disc drive.
>+---+---+---+---+---+---+---+----+---+---+
>          |   |   |   |   |        |   |
>          |   +---+---+   +--------+   +-- Access Time 0 = Standard/1 = Faster
>          |       |                |
> +--------+       +----------+     +----------------+
> FORM FACTOR                 MBytes                 INTERFACE
>+---------------------------+----------------------+-------------------------+
>|1xxx = 3.5"                |Unformatted (approx.) |Unspecified = ST412/MFM  |
>|     half-height (41 mm)   |e.g. ST225 is 25      |N  = SCSI                |
>|2xxx = 5.25"               |unformatted MBytes    |R  = ST412/RLL           |
>|     half-height (41 mm)   +----------------------+A  = AT Bus (IDE)        |
>|3xxx = 3.5"                |                      |X  = XT Bus (IDE)        |
>|     1-inch high (25 mm)   |                      |E  = ESDI                |
>|4xxx = 5.25"               |                      |J  = SMD/SME-E           |
>|     full-height (82 mm)   |                      |K  = IPI-2               |
>|6xxx = 9-inch              |                      |ND = Differential SCSI   |
>|8xxx = 8-inch              |                      |NM = Mac Compat. SCSI    |
>|9xxx = 2.5"                |                      |S  = Synchronized Spindle|
>|     .75-inch high (19 mm) |                      |V  = NetWare Ready       |
>+---------------------------+                      |P  = Write Pre-Comp      |

I believe the .75 inch stuff is 5xxx; can you tell me what an IPI-2 
interface is used for?  

Also, I have a CDC 94601-12GD, which I am guessing is a differential
drive but I don't know what the G stands for and I don't see any reference
to it above.  Since Seagate bought CDC, I'm trying to avoid calling them
and waiting on the phone for an hour to find out what it is.  Any help
much appreciated!


-- 
   __________sss k k  y  y  w   w  eee    a       sss eee  l __________
   _________ss   kk    yy    www   ee    aaa     ss   ee   l  _________
   _______sss    k k   y     w w   eee  a   a  sss    eee  llll________
             duncan@skypoint.com||||||skyweasel@skypoint.com

: I believe the .75 inch stuff is 5xxx; can you tell me what an IPI-2 
: interface is used for?  

ST5* is weird. ST506 was a 5.25" FH format, but I gather they have newer small 
cute ones with the same numbering :)

: Also, I have a CDC 94601-12GD, which I am guessing is a differential
: drive but I don't know what the G stands for and I don't see any reference
: to it above.  Since Seagate bought CDC, I'm trying to avoid calling them
: and waiting on the phone for an hour to find out what it is.  Any help
: much appreciated!

The CD  HD bible mentions those; the *G models were big, a la Gigabyte. 
'Course, I don't have my Bible right handy, but AFAIK. :)

For instance, your 12G is a 1.2G, right?
--
Home: dremu@emf.net     find me on the PSQ homepage http://www.emf.net/~quam
that's doctor emu          CDC SCSI and The Slosh on ftp.emf.net/users/dremu

Work: support@maxis.com     Maxis Software Toys: The SimCity People
Maxis -=- 2121 N California Blvd, Suite 600 -=- Walnut Creek CA 94596-3572
Voice  510.927.3521   FAX 510.927.3581   BBS 510.927.3910

                       Your best lies are ALWAYS at Fry's

and of course, the views expressed herein are those solely of the individual
and in no way are meant to express those of Maxis or any of its subsidiaries

Earl Baker wrote:
> 
> In article <316B73A4.167E@hiscom.nl>, Jouke Numan  <jnuman@hiscom.nl> wrote:
> >
> >The typenumbering scheme of SEAGATE is as follows:
> >
> >    <Stuff deleted here>
> >
> I believe the .75 inch stuff is 5xxx; can you tell me what an IPI-2
> interface is used for?
>

AFAIK, IPI-2 is a high-speed, low-level disk interface used in the main-frame world.


> Also, I have a CDC 94601-12GD, which I am guessing is a differential
> drive but I don't know what the G stands for and I don't see any reference
> to it above.  Since Seagate bought CDC, I'm trying to avoid calling them
> and waiting on the phone for an hour to find out what it is.  Any help
> much appreciated!

Your drive is a Wren VII FH with a SCSI/SASI interface, has an unformatted capacity of
1.2 Gb and is differential.

This info is from: ftp://ftp.seagate.com/techsuppt/misc/old94num.txt

Starting from ftp://ftp.seagate.com/techsuppt , you can retrieve a lot of info on SEAGATE/
IMPRIMIS & CDC drives.

> 
> --
>    __________sss k k  y  y  w   w  eee    a       sss eee  l __________
>    _________ss   kk    yy    www   ee    aaa     ss   ee   l  _________
>    _______sss    k k   y     w w   eee  a   a  sss    eee  llll________
>              duncan@skypoint.com||||||skyweasel@skypoint.com

-- 
+------------------------------------------------------+
| Signature of: Jouke Numan  <jnuman@hiscom.nl>        |
| HISCOM bv, department of Systems Development         |
| Schipholweg 97, 2316 AX  Leiden, the Netherlands     |
| +31-71-5256757 (office) +31-71-5216675 (FAX)         |
+------------------------------------------------------+

David Longley wrote:
> 
> I have just substituted a Barracuda ST15150ND for the 2.1GB barracuda
> I had running off the AHA2940 I had in my machine. After a brief flash
> of the drive's green LED and the sound of the disk starting, it seems
> to go no further. The AHA2940 does not see the drive.
> 
> Supposedly a new drive.......anyone with any helpful suggestions?
> 
> I have a nasty feeling about the ND!! Is this a "differential" rather than
> "narrow"? IF so, what can I do about it?
> --
> David Longley


I suppose it fell off the back of a truck...

Jouke Numan (jnuman@hiscom.nl) wrote:
: David Longley wrote:
: > 
: > I have just substituted a Barracuda ST15150ND for the 2.1GB barracuda
: > I had running off the AHA2940 I had in my machine. After a brief flash
: > of the drive's green LED and the sound of the disk starting, it seems
: > to go no further. The AHA2940 does not see the drive.
: > 
: > Supposedly a new drive.......anyone with any helpful suggestions?
: > 
: > I have a nasty feeling about the ND!! Is this a "differential" rather than
: > "narrow"? IF so, what can I do about it?
: > --
: > David Longley

: Yes, the N stands for SCSI (not narrow) the D stands for differential. You
: cannot connect a differential device to a single-ended controller as the
: electrical signals are quite different. You must either get a single ended
: Barracuda (type ST15150N) or a differential controller (I'm not sure if
: Adaptec has them, look at their WWW site). I don't know your specific needs,
: but unless you have to have differential for the extra cable-length, you
: should stick to single-ended. It's much easier to get hold on and cheaper
: as well.

: The typenumbering scheme of SEAGATE is as follows:


:   +----- Seagate              +----------- PR = Paired Solution. Drive shipped
:   |   +- Technology           |            with menu driven installation soft-
: +---+---+---+---+---+---+---+----+---+---+ ware. Seagate controller or host
: | S | T | 1 | 4 | 8 | 0 | A | PR | - | X | adapter included with disc drive.
: +---+---+---+---+---+---+---+----+---+---+
:           |   |   |   |   |        |   |
:           |   +---+---+   +--------+   +-- Access Time 0 = Standard/1 = Faster
:           |       |                |
:  +--------+       +----------+     +----------------+
:  FORM FACTOR                 MBytes                 INTERFACE
: +---------------------------+----------------------+-------------------------+
: |1xxx = 3.5"                |Unformatted (approx.) |Unspecified = ST412/MFM  |
: |     half-height (41 mm)   |e.g. ST225 is 25      |N  = SCSI                |
: |2xxx = 5.25"               |unformatted MBytes    |R  = ST412/RLL           |
: |     half-height (41 mm)   +----------------------+A  = AT Bus (IDE)        |
: |3xxx = 3.5"                |                      |X  = XT Bus (IDE)        |
: |     1-inch high (25 mm)   |                      |E  = ESDI                |
: |4xxx = 5.25"               |                      |J  = SMD/SME-E           |
: |     full-height (82 mm)   |                      |K  = IPI-2               |
: |6xxx = 9-inch              |                      |ND = Differential SCSI   |
: |8xxx = 8-inch              |                      |NM = Mac Compat. SCSI    |
: |9xxx = 2.5"                |                      |S  = Synchronized Spindle|
: |     .75-inch high (19 mm) |                      |V  = NetWare Ready       |
: +---------------------------+                      |P  = Write Pre-Comp      |


: -- 
: +------------------------------------------------------+
: | Signature of: Jouke Numan  <jnuman@hiscom.nl>        |
: | HISCOM bv, department of Systems Development         |
: | Schipholweg 97, 2316 AX  Leiden, the Netherlands     |
: | +31-71-5256757 (office) +31-71-5216675 (FAX)         |
: +------------------------------------------------------+

--
Jay Huldeen
jay@usa.net

David Longley wrote:
> 
> In article <829083915snz@longley.demon.co.uk>
>            David@longley.demon.co.uk "David Longley" writes:
> 
> > I have just substituted a Barracuda ST15150ND for the 2.1GB barracuda
> > I had running off the AHA2940 I had in my machine. After a brief flash
> > of the drive's green LED and the sound of the disk starting, it seems
> > to go no further. The AHA2940 does not see the drive.
> >
> > Supposedly a new drive.......anyone with any helpful suggestions?
> >
> > I have a nasty feeling about the ND!! Is this a "differential" rather than
> > "narrow"? IF so, what can I do about it?
> > --
> > David Longley
> >
> If so - I *assume* that's why it isn't working on my AHA2940. What *will*
> it work on, and why is there a "differential" version? What PC controllers
> are there which work with such drives..?
> 
> --
> David Longley

Try returning the drive to the vendor in trade for an "N" version. This happened to me and I did not hesitate to turn it around. Unless you want to spend the money on 
another controller ;-(

On Tue, 09 Apr 1996 19:58:01 -0700, William Moyer <flyer10@cris.com> wrote:

:David Longley wrote:
:> 

:There are adapters that you can buy to adapt your differential drive 
:to the single ended interface.  These are pretty inexpensive.  If you 
:are interested then e-mail or give me a call.
:
Would you mind briefly explaining the difference/advantage to going
differential? I have a DEC on my hands right now that's differential. It's
identical to another drive I already own except that one's *normal*

     >>>>>>>Acceptable Risk<<<<<<<<
     >>>Have a nice day, and duck!<<<    
     >>>>>>>risk@alpha.c2.org<<<<<<<
     
     Requests for files via e-mail will be ignored 
     due to a 32k limit!!! Meaning...
     I won't send 'em!!!

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         Taking the dog.

                Love, Dorothy

In article <31748175.5059017@news.cris.com>
           risk@alpha.c2.org "Acceptable Risk" writes:

> On Tue, 09 Apr 1996 19:58:01 -0700, William Moyer <flyer10@cris.com> wrote:
> 
> :David Longley wrote:
> :> 
> 
> :There are adapters that you can buy to adapt your differential drive 
> :to the single ended interface.  These are pretty inexpensive.  If you 
> :are interested then e-mail or give me a call.
> :
> Would you mind briefly explaining the difference/advantage to going
> differential? I have a DEC on my hands right now that's differential. It's
> identical to another drive I already own except that one's *normal*
> 
I have been told that the difference lies in the signalling not the physical
interface per se. The "differential" allows one to have cables over 3 x the
maximum length possible on "single ended" narrow drives. 
-- 
David Longley

Acceptable Risk (risk@alpha.c2.org) wrote:
[stuff deleted]
: Would you mind briefly explaining the difference/advantage to going
: differential? I have a DEC on my hands right now that's differential. It's
: identical to another drive I already own except that one's *normal*

Differential SCSI uses differential line drivers - contrary to the
"normal" single-ended (SE) drivers.

Advantage: 25 m maximum bus length (6 m for SE, 3 m for FAST-SE).
Less trouble with poor cables. The longer bus comes in handy when
you need lots of devices (Wide SCSI supports to 16...).

--
Ralf.

> Differential SCSI uses differential line drivers - contrary to the
> "normal" single-ended (SE) drivers.
> 
> Advantage: 25 m maximum bus length (6 m for SE, 3 m for FAST-SE).
> Less trouble with poor cables. The longer bus comes in handy when
> you need lots of devices (Wide SCSI supports to 16...).
> 
> --
> Ralf.

As I understand it, the differential doesn't have a ground line.  It uses 
a fixed, non-zero voltage for both ends, reducing the effects of induced 
voltage on the operation of the SCSI bus.

Matt