🚀 go-pugleaf

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)         |
+------------------------------------------------------+